CA1183734A - Process and compositions for lithographic printing in multiple layers - Google Patents
Process and compositions for lithographic printing in multiple layersInfo
- Publication number
- CA1183734A CA1183734A CA000421252A CA421252A CA1183734A CA 1183734 A CA1183734 A CA 1183734A CA 000421252 A CA000421252 A CA 000421252A CA 421252 A CA421252 A CA 421252A CA 1183734 A CA1183734 A CA 1183734A
- Authority
- CA
- Canada
- Prior art keywords
- varnish
- hiding
- coat
- layer
- resin system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 19
- 239000000203 mixture Substances 0.000 title abstract description 37
- 239000002966 varnish Substances 0.000 claims abstract description 62
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 18
- 239000002904 solvent Substances 0.000 claims abstract description 17
- 229920000180 alkyd Polymers 0.000 claims description 10
- 150000002148 esters Chemical class 0.000 claims description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims 2
- 238000007644 letterpress printing Methods 0.000 claims 1
- 239000006193 liquid solution Substances 0.000 claims 1
- 230000000873 masking effect Effects 0.000 claims 1
- 230000001681 protective effect Effects 0.000 claims 1
- 239000002002 slurry Substances 0.000 claims 1
- 238000009472 formulation Methods 0.000 abstract description 32
- 238000006748 scratching Methods 0.000 abstract description 4
- 230000002393 scratching effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 18
- 239000001993 wax Substances 0.000 description 12
- 239000004215 Carbon black (E152) Substances 0.000 description 9
- 239000003349 gelling agent Substances 0.000 description 9
- 229930195733 hydrocarbon Natural products 0.000 description 9
- 150000002430 hydrocarbons Chemical class 0.000 description 9
- 239000002383 tung oil Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 7
- 238000001459 lithography Methods 0.000 description 7
- 239000000049 pigment Substances 0.000 description 7
- 239000013032 Hydrocarbon resin Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 229920006270 hydrocarbon resin Polymers 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 235000019198 oils Nutrition 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 4
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 239000000944 linseed oil Substances 0.000 description 4
- 235000021388 linseed oil Nutrition 0.000 description 4
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 4
- MMEDJBFVJUFIDD-UHFFFAOYSA-N 2-[2-(carboxymethyl)phenyl]acetic acid Chemical compound OC(=O)CC1=CC=CC=C1CC(O)=O MMEDJBFVJUFIDD-UHFFFAOYSA-N 0.000 description 3
- -1 Polyethylene Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000012170 montan wax Substances 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000006873 Coates reaction Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 2
- UKRVECBFDMVBPU-UHFFFAOYSA-N ethyl 3-oxoheptanoate Chemical compound CCCCC(=O)CC(=O)OCC UKRVECBFDMVBPU-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 235000010678 Paulownia tomentosa Nutrition 0.000 description 1
- 240000002834 Paulownia tomentosa Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 210000004905 finger nail Anatomy 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 125000005474 octanoate group Chemical group 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 239000012255 powdered metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 235000002020 sage Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- HJHVQCXHVMGZNC-JCJNLNMISA-M sodium;(2z)-2-[(3r,4s,5s,8s,9s,10s,11r,13r,14s,16s)-16-acetyloxy-3,11-dihydroxy-4,8,10,14-tetramethyl-2,3,4,5,6,7,9,11,12,13,15,16-dodecahydro-1h-cyclopenta[a]phenanthren-17-ylidene]-6-methylhept-5-enoate Chemical compound [Na+].O[C@@H]([C@@H]12)C[C@H]3\C(=C(/CCC=C(C)C)C([O-])=O)[C@@H](OC(C)=O)C[C@]3(C)[C@@]2(C)CC[C@@H]2[C@]1(C)CC[C@@H](O)[C@H]2C HJHVQCXHVMGZNC-JCJNLNMISA-M 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000003981 vehicle Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/005—Colour cards; Painting supports; Latent or hidden images, e.g. for games; Time delayed images
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S283/00—Printed matter
- Y10S283/901—Concealed data
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S283/00—Printed matter
- Y10S283/903—Lottery ticket
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31844—Of natural gum, rosin, natural oil or lac
- Y10T428/31848—Next to cellulosic
- Y10T428/31851—Natural oil
Abstract
ABSTRACT
Printed materials such as tickets, lottery forms, cards and contest forms, bearing a hidden message which is revealable by the consumer scratching off a covering opaque layer, are prepared by lithographing a varnish layer over the hidden message, and then lithographing a hiding coat over the applied varnish layer. The varnish formulation and the hiding coat layer are both based upon compatible, preferably the same, film forming resin systems, and are deposited from a common solvent.
Printed materials such as tickets, lottery forms, cards and contest forms, bearing a hidden message which is revealable by the consumer scratching off a covering opaque layer, are prepared by lithographing a varnish layer over the hidden message, and then lithographing a hiding coat over the applied varnish layer. The varnish formulation and the hiding coat layer are both based upon compatible, preferably the same, film forming resin systems, and are deposited from a common solvent.
Description
3f~
This invention relates to printing methods and printing ink compositions More particularly, it relates to methods and compositions for making sheets such as paper sheets or cards covered with superimposed layers of print, the lower of which comprises a "hidden" message which is masked from a reader unless and until an upper coating is removed~ e.g. by abrasion, scratching or erasures.
Recently, the preparation and distribution of promotional game cards, premium cards, lottery tickets and the like, containing hidden messages or symbols has become popular and widespread, in fund raising and product promotion. The recipient of such a card must remove from the card a layer of hiding coating in order to reveal a message or symbol. Such items are, however, difficult to prepare and print in an economical fashion, because of the technical specifications they must fulfil.
Such a card bearing a hidden message should have at least two coating layers overlying the hidden message.
Immediately over the me~:sage, there is provided a layer of normally transparent or translucent varnish~ through which the message can be read. Over the varnish layer is provided a hiding layer, which is opa~ue in nature but which can be stripped away by the recipient, e.g. by scratching etc., to reveal the message through the varnish coat. Thus, the varnish coat serves to protect the message from permanent obliteration by the applicatlon of, or by the abrasive removal of the hiding coat. At the same time, the correct degree of adhesion or ~ffinity between the varnish and the hiding coat must be achieved, so that the coat remains in place and opaque to hide the message during storage, shipping~ packaging, and transportation of the cards, but nevertheless is readily removable by abrasion by the user at the required time, to render the message visible, leaving the varnish coat substantially unaffected. Effectively, one must satisfy two essentially contradictory requirements in the relationship between the varnish coat and the hiding coat, to render them lU mutually compatible and adhesive to one another at one time, and incompatible and non-adhesive to one another at another time.
Heretofore, these mutually inconsistent requirements have been satisfied by using a thick hiding coat applied by silk screen methods, over a thin varnish coat applied by lithographic methods or by silk screen methods. In view of its thickness and consistency, the only practical way oE applying the hiding coat is by silk screening. This is costly and inconvenient.
Lithography is the cheapest, fastest way of printing and applying coatings to such cards. To have to apply one coating by lithography and the other coating by silk screening entails the transfer of the card stock from one printing machine to another, or even the transferring from one printing plant to another printing plant, with consequent added inconvenience, extra expense and loss of security.
The present invention provides an improved process for preparing printed or coated cards or similar items bearing hidden messages under a layer of varnish and a layer of q~3~
hiding coat superimposed thereonO In the process of the present invention, both the varnish and the hiding coa~ may be applied to the card lithographically. To facilitate this, the varnish coat formulation and the hiding coat formulation are deposited from compatible solvent systems and ~ontain mutually compatible resin systems. Then the hiding coat, containing opacifying pigments, can be applied as a thin layer, suitably formulated to be applied by lithography, and still exhibit the necessary hiding power whilst being abrasively removable. In addition, if desired~ further printing of patterns can be applied over the hiding coat.
The varnish formulation and the hiding coat formulation have film-forming resin systems which are mutually compatible.
Preferably they comprise generally the same resins or types of resins in both formulations. The varnish formulation is normally pigment free, so as to produce a light coloured translucent or transparent film when dried and cured in place, to reveal the message below. As compared with varnish previously used for this purpose, that used in the present invention has a higher energy surface, less repellant to and compatible with the pigmented hiding coat. The varnish formulation contains curatives (hardeners) which will result in the formation of a hard, cured film, but which is not so hard as to reject the application of the hiding coat. The hiding coat preferably contains the same or similar film forming resin system, but is cured to a lesser degree. The relative degree of cure between the two layers helps to adjust the degree 3~
of adhesion between ~hem ~ending ~o fulfill the contradictory requirements mentioned above, and permits the scratch-off removal of the hiding coatO
Preferably, the hiding coat contains pigments or opacifying agents which render the finished coat not only visibly opaque but also opaque to all other forms and wavelengths of radiation also, so that the hidden message cannot be prematurely revealed e.g. by X-rays, UV light etc. For this purpose the hiding coat formulation should contain a powdered metal such as powdered aluminum, in addition to regular pigments such as carbon black, dyes etc.
Examples of suitable resins for use in both the varnish and the hiding coat formulation are phenolic resins such as phenolic modifiecl rosin esters, hydrocarbon resins, alkyd resins such as linseed-isophthalic alkyd and other unsaturated alkyd resins and the like, and mixtures thereof. Such resin systems are curable with heavy metal-orcJanic salts such as manganese octoate and cobalt octoate, to yield light coloured or transparent films. They can be plasticised if desired, e.g.
with waxes of the hydrocarbon type. The varnish formulation should of course be free from pigments, but may contain other ingredients in minor proportions to modify its surEace properties. For example, small amounts of Montan wax, Carnuaba wax or another natural or synthetic wax of similar characteristics, can be added to give a harder surface finish.
Such a wax component in the varnish may in fact migrate to the surface of the coating aEter curing ("bloom") and then 73~
con~ribute to the surface chaeacteristics of the cured varnish layer. The hiding coat formulation shsuld include a drying oil such as refined linseed oil, and smaller amounts of curative7 along with opacifying agents, to yield a film of suitable hiding qualities and compatibility with the varnish film, yet readily abrasively removable therefrom~
As noted, both the varnish formulation and the hiding coat formulation should be deposited from compatible solvent systems, and preferably from the same solvent system.
Hydrocarbon solvents (e.g. Magie oil, a mixture of aliphatic and aromatic oils) are preferred. The varnish formulation will normally contain substantially larger proportions of solvent, an~
hence be of substantially thinner consistency, than the hiding coat formulation. Both formulations are nevertheless of a suitable consistency for application by lithography~ The solvent used for the hiding coat should not be capable of penetrating the cured varnish coat to any significant extent, despite the fact that the very same so:Lvent may well have constituted the vehicle for deposition of the uncured varnish.
Accordingly, a fast drying varnish system is chosen, which cures to a hard finish to prevent solvent and pigment penetration thereof from the hiding coat, but which never~heless "traps" to the subsequently applied hiding coat to the necessary degree.
In order to be satisfactory for lithographic application, an ink or varnish formulation must be adjustea in relation to the printing machine speed, to adjust its rate of drying and curing. On a high speed machine, the amount of heat generated by the machine may cure the varnish to such an extent that the applied layer will not transfer from the plate cylinder to the rubber blanket cylinder and on down the roller train~
Accordingly, depending upon the speed and nature of the lithographic printing machine by means of which the varnish is to be applied, it may be necessary to retard the drying or hardening rate of the varnish as compared with normal varnishes. When a slower speed machine is employed, such retardation may not be necessary.
The following is a preferred general formulation for the varnish for use in the present invention, particularly for use with fast running web litho printing machines, with the ingredients expressed as percentages by weight.
Components ~ Ran~e 15 Magie oil (solvent) 30-35 Phenolic modified rosin ester 16-20 Hydrocarbon resin (e.g. of the PICCOPAhE~ type) 13-17 Linseed-isophthalic alkyd 10-13 Hydrocarbon plastici~er (e.g~ of the Dl;1'rREX* type) 7~10 20 Montan wax 3~6 Calcium perborate 1.5~3 Manganese oct~ate 1.5-2 Cobalt octoate 0.5-1 Gelling agent 0.5-0.7 25 Chinawood oil 0.3-0.5 *Trade mark In this formulation~ cobalt octoa~e, manganese octoate and calcium perborate constitute the curing system. The calcium perborate helps to cure the chinawood oil, by supplying oxygen thereto. Similar hydrocarbon flexibilizer may be used in place of DUT~X as the plasticizer. Also similar hydrocarbon rosins may be used in place of PICCOPALE. The chinawood oil (tung oil3 is optionally added, to adjust the consistency and tackiness of the surface. The gelling agent also adjust the consistency of the formulation. As gelling agent, there can be used any sui~able product rom the reaction of an unsaturated fatty aci~, a solvent and cal~ium octoate. AlternatiYely, thickeners such as fumed silica may be used as or instead of a gelling agent.
For varnish appLication using a slower, sheet fed machine, such a varnish might not result in a coating which would satisfactorily trap the hiding coat. The above formulation would accordingly be modified, for example by redl~cing or omittLng one or more of the gelling agents, calcium perborate, chinawood oil, w~x or hydrocarbon resin.
The following is a preferred general formulation for the hiding coat for the use in the present in~ention, with the above varnish formulation with the ingredients expressed as percentages by weight:
Com~nents ~ Range Titanium dioxide 28-35 25 Aluminum powder 15-20 Phenolic modified rosin ester 15-18 Linseed oil refined 9-11 Black pigmen~ (carbon black) 7-8 Linseed-isoph~halic alkyd 5-8 Magie solvent 5-7 Cobalt octoate 0~5-1 Chinawood oil 0.5-1 Hydrocarbon resin 0.5-1 Polyethylene wax 0.3-0.5 Fischer-Tropsch wax 0.2-0.5 Gelling agent 0.5-1 It will be noted that the above formulation has the same basic resin system and solvent as the varnish ormulation.
It differs, however, in the amount of solvent an~ hence consistency, in ~:he amoun~ of curing system, and in the presence of opacifying agents. Both formuLations include plasticizer lS (polyethylene wax and Fischer~Tropsch wax, both hydrocarbon waxes, and hydrocarbon p:lasticizers). Other similar natural or synthetic waxes could be used in replacement thereof. Other suitable unsaturated oils may be used instead of linseed oil, and instead of chinawood oil. The gelling agent is as described in connection with the varnish coat. The presence of some such unsaturated oil is highly advantageous in providing the best "scratch-off" properties. The linseed-isophthalic alkyd resin itl both formulations is representative of a large variety of available such materialsr and substantially any other unsaturated alkyd could be used instead. Isophthalics are preferred, however.
The varnish coat is suitably applied to the printed card stock by sheet fed or web lithograph methods, in several passes to apply several layers thereof. The aforementioned formulations are most suitable for sh~et fed lithography. The consis~ency of ~he formulations needs adjustmen~ to render them S more suitable for web lithography.
The layers, suitably 2-5 in number, may be applied wet-on-wet, i~e. without waiting for the previously applied layer of vaenish ~o dry and cure. The ~otal varnish coat must however be dried and cured before the hiding coat is applied.
Then the hiding coat is also suitably applied to the stock, over the ~arnish, in one or several wet~on-we~ layers, and then allowed to dry and cure.
The resulting hiding coat is durable not only to withstand normal storage and handling, but also to receive further overprintings with additional hiding layers, patterns or printed information, should this be required. The scratch~off portion can be readily removed by the user's fingernails, without abrasives, coins, files, erasers or the like, to show clearly the overprinted hidden message.
The invention is further illustrated in the following specific examples.
Example The following specific varnish formulation and hiding coat formulation were made up, with ingredients listed as parts by weight:
,.
'73~
V~rnish ~ Parts Magie oil 32 Phenolic modified resin ester 18 Hydrocarbon resin (PICCOPALE type)16 Linseed-isophthalic alkyd 10 Hydrocarbon plasticizer (DUT~EX type) 8 Montan wax 305 Calcium perborate 2 . 2 Manganese oc'coate 1. 8 Cobal~ oc~oate 0.7 Gelling agent 0 . 5 Chinawood oil 0-3 Hidinq Coat ComPOnents Parts _ Titanium dioxide (TIOXIDE*) 32 Aluminum powder 18 Phenolic modified resin ester 16 20 Linseed oil refined lO
Black pigment 8 Linseed-isophthalic alkyd 5 Magie solvent 6 Cobalt oc~coate 0 . 6 25 Chinawood oil 0.6 Hydrocarbon resin (PICCOPALE type) Polyethylene wax 0.3 '~' 1'~
3~
Fischer-Tropsch wax 0.3 Gelling agent 0.6 The varnish fromulation was applied, by sheet fed lithography using a standard printing machine, to a card stock previously printed with a message to be hidden. Three layers Qf varnish were applied successively, wet on wet~ and then the applied varnish was allowed to dry and cure. ~ light coloured, transparent film was formed, through which the underlying printed message was clearly visible and legible.
Next, using the same sheet fed lithographic printing machine, ~he hiding coat was applied over the cured varnish coat. Four layers were applied, wet on wet, and then the hiding coat was allowed to dry.
The hiding coat so forméd completely obliterated the underlying message. It was durable enough to withstand normal handling and packaging. Nevertheless, it was removable by scratching with a ~ingernail, to reveal the varnish coat substantially unaffected, through which the printed ~essage was clearly visible.
Whilst according to the invention, it is preferred to apply the varnish coat and the hiding coat lithographically, it is nevertheless possible to apply the varnish coat by letterpress application and the hiding coat lithographically, thus retaining the principle advantage, of avoiding silk screen application. In such case, the hydrocarbon rosin component is omitted from the varnish formulation.
*Trade mark
This invention relates to printing methods and printing ink compositions More particularly, it relates to methods and compositions for making sheets such as paper sheets or cards covered with superimposed layers of print, the lower of which comprises a "hidden" message which is masked from a reader unless and until an upper coating is removed~ e.g. by abrasion, scratching or erasures.
Recently, the preparation and distribution of promotional game cards, premium cards, lottery tickets and the like, containing hidden messages or symbols has become popular and widespread, in fund raising and product promotion. The recipient of such a card must remove from the card a layer of hiding coating in order to reveal a message or symbol. Such items are, however, difficult to prepare and print in an economical fashion, because of the technical specifications they must fulfil.
Such a card bearing a hidden message should have at least two coating layers overlying the hidden message.
Immediately over the me~:sage, there is provided a layer of normally transparent or translucent varnish~ through which the message can be read. Over the varnish layer is provided a hiding layer, which is opa~ue in nature but which can be stripped away by the recipient, e.g. by scratching etc., to reveal the message through the varnish coat. Thus, the varnish coat serves to protect the message from permanent obliteration by the applicatlon of, or by the abrasive removal of the hiding coat. At the same time, the correct degree of adhesion or ~ffinity between the varnish and the hiding coat must be achieved, so that the coat remains in place and opaque to hide the message during storage, shipping~ packaging, and transportation of the cards, but nevertheless is readily removable by abrasion by the user at the required time, to render the message visible, leaving the varnish coat substantially unaffected. Effectively, one must satisfy two essentially contradictory requirements in the relationship between the varnish coat and the hiding coat, to render them lU mutually compatible and adhesive to one another at one time, and incompatible and non-adhesive to one another at another time.
Heretofore, these mutually inconsistent requirements have been satisfied by using a thick hiding coat applied by silk screen methods, over a thin varnish coat applied by lithographic methods or by silk screen methods. In view of its thickness and consistency, the only practical way oE applying the hiding coat is by silk screening. This is costly and inconvenient.
Lithography is the cheapest, fastest way of printing and applying coatings to such cards. To have to apply one coating by lithography and the other coating by silk screening entails the transfer of the card stock from one printing machine to another, or even the transferring from one printing plant to another printing plant, with consequent added inconvenience, extra expense and loss of security.
The present invention provides an improved process for preparing printed or coated cards or similar items bearing hidden messages under a layer of varnish and a layer of q~3~
hiding coat superimposed thereonO In the process of the present invention, both the varnish and the hiding coa~ may be applied to the card lithographically. To facilitate this, the varnish coat formulation and the hiding coat formulation are deposited from compatible solvent systems and ~ontain mutually compatible resin systems. Then the hiding coat, containing opacifying pigments, can be applied as a thin layer, suitably formulated to be applied by lithography, and still exhibit the necessary hiding power whilst being abrasively removable. In addition, if desired~ further printing of patterns can be applied over the hiding coat.
The varnish formulation and the hiding coat formulation have film-forming resin systems which are mutually compatible.
Preferably they comprise generally the same resins or types of resins in both formulations. The varnish formulation is normally pigment free, so as to produce a light coloured translucent or transparent film when dried and cured in place, to reveal the message below. As compared with varnish previously used for this purpose, that used in the present invention has a higher energy surface, less repellant to and compatible with the pigmented hiding coat. The varnish formulation contains curatives (hardeners) which will result in the formation of a hard, cured film, but which is not so hard as to reject the application of the hiding coat. The hiding coat preferably contains the same or similar film forming resin system, but is cured to a lesser degree. The relative degree of cure between the two layers helps to adjust the degree 3~
of adhesion between ~hem ~ending ~o fulfill the contradictory requirements mentioned above, and permits the scratch-off removal of the hiding coatO
Preferably, the hiding coat contains pigments or opacifying agents which render the finished coat not only visibly opaque but also opaque to all other forms and wavelengths of radiation also, so that the hidden message cannot be prematurely revealed e.g. by X-rays, UV light etc. For this purpose the hiding coat formulation should contain a powdered metal such as powdered aluminum, in addition to regular pigments such as carbon black, dyes etc.
Examples of suitable resins for use in both the varnish and the hiding coat formulation are phenolic resins such as phenolic modifiecl rosin esters, hydrocarbon resins, alkyd resins such as linseed-isophthalic alkyd and other unsaturated alkyd resins and the like, and mixtures thereof. Such resin systems are curable with heavy metal-orcJanic salts such as manganese octoate and cobalt octoate, to yield light coloured or transparent films. They can be plasticised if desired, e.g.
with waxes of the hydrocarbon type. The varnish formulation should of course be free from pigments, but may contain other ingredients in minor proportions to modify its surEace properties. For example, small amounts of Montan wax, Carnuaba wax or another natural or synthetic wax of similar characteristics, can be added to give a harder surface finish.
Such a wax component in the varnish may in fact migrate to the surface of the coating aEter curing ("bloom") and then 73~
con~ribute to the surface chaeacteristics of the cured varnish layer. The hiding coat formulation shsuld include a drying oil such as refined linseed oil, and smaller amounts of curative7 along with opacifying agents, to yield a film of suitable hiding qualities and compatibility with the varnish film, yet readily abrasively removable therefrom~
As noted, both the varnish formulation and the hiding coat formulation should be deposited from compatible solvent systems, and preferably from the same solvent system.
Hydrocarbon solvents (e.g. Magie oil, a mixture of aliphatic and aromatic oils) are preferred. The varnish formulation will normally contain substantially larger proportions of solvent, an~
hence be of substantially thinner consistency, than the hiding coat formulation. Both formulations are nevertheless of a suitable consistency for application by lithography~ The solvent used for the hiding coat should not be capable of penetrating the cured varnish coat to any significant extent, despite the fact that the very same so:Lvent may well have constituted the vehicle for deposition of the uncured varnish.
Accordingly, a fast drying varnish system is chosen, which cures to a hard finish to prevent solvent and pigment penetration thereof from the hiding coat, but which never~heless "traps" to the subsequently applied hiding coat to the necessary degree.
In order to be satisfactory for lithographic application, an ink or varnish formulation must be adjustea in relation to the printing machine speed, to adjust its rate of drying and curing. On a high speed machine, the amount of heat generated by the machine may cure the varnish to such an extent that the applied layer will not transfer from the plate cylinder to the rubber blanket cylinder and on down the roller train~
Accordingly, depending upon the speed and nature of the lithographic printing machine by means of which the varnish is to be applied, it may be necessary to retard the drying or hardening rate of the varnish as compared with normal varnishes. When a slower speed machine is employed, such retardation may not be necessary.
The following is a preferred general formulation for the varnish for use in the present invention, particularly for use with fast running web litho printing machines, with the ingredients expressed as percentages by weight.
Components ~ Ran~e 15 Magie oil (solvent) 30-35 Phenolic modified rosin ester 16-20 Hydrocarbon resin (e.g. of the PICCOPAhE~ type) 13-17 Linseed-isophthalic alkyd 10-13 Hydrocarbon plastici~er (e.g~ of the Dl;1'rREX* type) 7~10 20 Montan wax 3~6 Calcium perborate 1.5~3 Manganese oct~ate 1.5-2 Cobalt octoate 0.5-1 Gelling agent 0.5-0.7 25 Chinawood oil 0.3-0.5 *Trade mark In this formulation~ cobalt octoa~e, manganese octoate and calcium perborate constitute the curing system. The calcium perborate helps to cure the chinawood oil, by supplying oxygen thereto. Similar hydrocarbon flexibilizer may be used in place of DUT~X as the plasticizer. Also similar hydrocarbon rosins may be used in place of PICCOPALE. The chinawood oil (tung oil3 is optionally added, to adjust the consistency and tackiness of the surface. The gelling agent also adjust the consistency of the formulation. As gelling agent, there can be used any sui~able product rom the reaction of an unsaturated fatty aci~, a solvent and cal~ium octoate. AlternatiYely, thickeners such as fumed silica may be used as or instead of a gelling agent.
For varnish appLication using a slower, sheet fed machine, such a varnish might not result in a coating which would satisfactorily trap the hiding coat. The above formulation would accordingly be modified, for example by redl~cing or omittLng one or more of the gelling agents, calcium perborate, chinawood oil, w~x or hydrocarbon resin.
The following is a preferred general formulation for the hiding coat for the use in the present in~ention, with the above varnish formulation with the ingredients expressed as percentages by weight:
Com~nents ~ Range Titanium dioxide 28-35 25 Aluminum powder 15-20 Phenolic modified rosin ester 15-18 Linseed oil refined 9-11 Black pigmen~ (carbon black) 7-8 Linseed-isoph~halic alkyd 5-8 Magie solvent 5-7 Cobalt octoate 0~5-1 Chinawood oil 0.5-1 Hydrocarbon resin 0.5-1 Polyethylene wax 0.3-0.5 Fischer-Tropsch wax 0.2-0.5 Gelling agent 0.5-1 It will be noted that the above formulation has the same basic resin system and solvent as the varnish ormulation.
It differs, however, in the amount of solvent an~ hence consistency, in ~:he amoun~ of curing system, and in the presence of opacifying agents. Both formuLations include plasticizer lS (polyethylene wax and Fischer~Tropsch wax, both hydrocarbon waxes, and hydrocarbon p:lasticizers). Other similar natural or synthetic waxes could be used in replacement thereof. Other suitable unsaturated oils may be used instead of linseed oil, and instead of chinawood oil. The gelling agent is as described in connection with the varnish coat. The presence of some such unsaturated oil is highly advantageous in providing the best "scratch-off" properties. The linseed-isophthalic alkyd resin itl both formulations is representative of a large variety of available such materialsr and substantially any other unsaturated alkyd could be used instead. Isophthalics are preferred, however.
The varnish coat is suitably applied to the printed card stock by sheet fed or web lithograph methods, in several passes to apply several layers thereof. The aforementioned formulations are most suitable for sh~et fed lithography. The consis~ency of ~he formulations needs adjustmen~ to render them S more suitable for web lithography.
The layers, suitably 2-5 in number, may be applied wet-on-wet, i~e. without waiting for the previously applied layer of vaenish ~o dry and cure. The ~otal varnish coat must however be dried and cured before the hiding coat is applied.
Then the hiding coat is also suitably applied to the stock, over the ~arnish, in one or several wet~on-we~ layers, and then allowed to dry and cure.
The resulting hiding coat is durable not only to withstand normal storage and handling, but also to receive further overprintings with additional hiding layers, patterns or printed information, should this be required. The scratch~off portion can be readily removed by the user's fingernails, without abrasives, coins, files, erasers or the like, to show clearly the overprinted hidden message.
The invention is further illustrated in the following specific examples.
Example The following specific varnish formulation and hiding coat formulation were made up, with ingredients listed as parts by weight:
,.
'73~
V~rnish ~ Parts Magie oil 32 Phenolic modified resin ester 18 Hydrocarbon resin (PICCOPALE type)16 Linseed-isophthalic alkyd 10 Hydrocarbon plasticizer (DUT~EX type) 8 Montan wax 305 Calcium perborate 2 . 2 Manganese oc'coate 1. 8 Cobal~ oc~oate 0.7 Gelling agent 0 . 5 Chinawood oil 0-3 Hidinq Coat ComPOnents Parts _ Titanium dioxide (TIOXIDE*) 32 Aluminum powder 18 Phenolic modified resin ester 16 20 Linseed oil refined lO
Black pigment 8 Linseed-isophthalic alkyd 5 Magie solvent 6 Cobalt oc~coate 0 . 6 25 Chinawood oil 0.6 Hydrocarbon resin (PICCOPALE type) Polyethylene wax 0.3 '~' 1'~
3~
Fischer-Tropsch wax 0.3 Gelling agent 0.6 The varnish fromulation was applied, by sheet fed lithography using a standard printing machine, to a card stock previously printed with a message to be hidden. Three layers Qf varnish were applied successively, wet on wet~ and then the applied varnish was allowed to dry and cure. ~ light coloured, transparent film was formed, through which the underlying printed message was clearly visible and legible.
Next, using the same sheet fed lithographic printing machine, ~he hiding coat was applied over the cured varnish coat. Four layers were applied, wet on wet, and then the hiding coat was allowed to dry.
The hiding coat so forméd completely obliterated the underlying message. It was durable enough to withstand normal handling and packaging. Nevertheless, it was removable by scratching with a ~ingernail, to reveal the varnish coat substantially unaffected, through which the printed ~essage was clearly visible.
Whilst according to the invention, it is preferred to apply the varnish coat and the hiding coat lithographically, it is nevertheless possible to apply the varnish coat by letterpress application and the hiding coat lithographically, thus retaining the principle advantage, of avoiding silk screen application. In such case, the hydrocarbon rosin component is omitted from the varnish formulation.
*Trade mark
Claims (10)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process of masking an indicia deposited on a printable substrate with an opaque cover layer which is abrasively removable to unmask said indicia, which comprises:
applying to the substrate over the indicia by lithographic or letterpress printing methods, at least one layer of protective transparent or translucent varnish;
allowing said at least one varnish layer to dry and cure to form a transparent or translucent varnish film over said indicia;
lithographically applying thereto at least one pigmented hiding layer over said varnish;
allowing said at least one hiding layer to dry and cure to form an opaque, abrasion-removable mask over said varnish;
the film forming resin system of the varnish being substantially compatible with the film forming resin system of the hiding coat.
applying to the substrate over the indicia by lithographic or letterpress printing methods, at least one layer of protective transparent or translucent varnish;
allowing said at least one varnish layer to dry and cure to form a transparent or translucent varnish film over said indicia;
lithographically applying thereto at least one pigmented hiding layer over said varnish;
allowing said at least one hiding layer to dry and cure to form an opaque, abrasion-removable mask over said varnish;
the film forming resin system of the varnish being substantially compatible with the film forming resin system of the hiding coat.
2. The process of claim 1 wherein the varnish and the hiding coat are both lithographically applied as liquid solutions or slurries in a common solvent.
3. The process of claim 2 where in the varnish and the hiding coat include the same film forming resin system.
4. The process of claim 3 wherein the varnish and the hiding coat both include curatives for said resin system, the varnish including a larger amount of curative than the hiding coat.
5. The process of claim 2, claim 3 or claim 4 wherein the resin system includes phenolic modified resin ester.
6. The process of claim 3 wherein the varnish contains a wax.
7. The process of claim 6 wherein the hiding coat contains an unsaturated oil.
8. The process of claim 7 wherein the resin system also includes linseed-isophthalic alkyd resin.
9. The process of claim 1, claim 2 or wherein the hiding coat includes powdered aluminum.
10. The process of claim 1, claim 2 or claim 4 wherein the varnish contains from 30-35 weight percent solvent and the hiding coat contains from 5-7 weight percent solvent.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000421252A CA1183734A (en) | 1983-02-09 | 1983-02-09 | Process and compositions for lithographic printing in multiple layers |
| US06/578,556 US4536218A (en) | 1983-02-09 | 1984-02-08 | Process and compositions for lithographic printing in multiple layers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000421252A CA1183734A (en) | 1983-02-09 | 1983-02-09 | Process and compositions for lithographic printing in multiple layers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1183734A true CA1183734A (en) | 1985-03-12 |
Family
ID=4124527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000421252A Expired CA1183734A (en) | 1983-02-09 | 1983-02-09 | Process and compositions for lithographic printing in multiple layers |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4536218A (en) |
| CA (1) | CA1183734A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0358610A2 (en) * | 1988-09-05 | 1990-03-14 | Sicpa Holding S.A. | Printing ink for making erasable prints |
| WO1997043126A1 (en) * | 1996-05-14 | 1997-11-20 | The British Printing Company Ltd. | Improved process for the production of scratch-off cards |
Families Citing this family (42)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4726608A (en) * | 1986-08-05 | 1988-02-23 | Scientific Games Of California, Inc. | Information bearing article with tamper resistant scratch-off opaque coating |
| US5346258A (en) * | 1992-05-07 | 1994-09-13 | Scientific Games, Inc. | Game ticket confusion patterns |
| US5667250A (en) * | 1992-05-07 | 1997-09-16 | Behm; William F. | Game ticket confusion patterns |
| US5286061A (en) * | 1992-10-09 | 1994-02-15 | Scientific Games, Inc. | Lottery ticket having validation data printed in developable invisible ink |
| US5475205A (en) * | 1994-06-22 | 1995-12-12 | Scientific Games Inc. | Document verification system |
| US5599046A (en) * | 1994-06-22 | 1997-02-04 | Scientific Games Inc. | Lottery ticket structure with circuit elements |
| US5811481A (en) * | 1995-06-07 | 1998-09-22 | Elf Atochem North America, Inc. | Lithographic ink |
| US5630363A (en) | 1995-08-14 | 1997-05-20 | Williamson Printing Corporation | Combined lithographic/flexographic printing apparatus and process |
| US5651316A (en) * | 1995-10-02 | 1997-07-29 | Howard W. DeMoore | Retractable printing/coating unit operable on the plate and blanket cylinders simultaneously from the dampener side of the first printing unit or any consecutive printing unit of any rotary offset printing press |
| US6159274A (en) * | 1997-12-26 | 2000-12-12 | Nisshinbo Industries, Inc. | Coloring mechanism and a recording material with the mechanism |
| IE990841A1 (en) * | 1999-06-15 | 2001-02-21 | Kcm Partnership | Printing method |
| US6990904B2 (en) | 2000-10-31 | 2006-01-31 | International Imaging Materials, Inc | Thermal transfer assembly for ceramic imaging |
| US6796733B2 (en) | 2000-10-31 | 2004-09-28 | International Imaging Materials Inc. | Thermal transfer ribbon with frosting ink layer |
| US6854386B2 (en) | 2000-10-31 | 2005-02-15 | International Imaging Materials Inc. | Ceramic decal assembly |
| US7507453B2 (en) * | 2000-10-31 | 2009-03-24 | International Imaging Materials, Inc | Digital decoration and marking of glass and ceramic substrates |
| US6729656B2 (en) | 2002-02-13 | 2004-05-04 | T.S.D. Llc | Debit card having applied personal identification number (PIN) and scratch-off coating and method of forming same |
| US7134959B2 (en) | 2003-06-25 | 2006-11-14 | Scientific Games Royalty Corporation | Methods and apparatus for providing a lottery game |
| US6908240B1 (en) * | 2003-12-16 | 2005-06-21 | International Imaging Materials, Inc | Thermal printing and cleaning assembly |
| US7364091B2 (en) | 2003-12-19 | 2008-04-29 | Scientific Games International, Inc. | Embedded optical signatures in documents |
| JP4185879B2 (en) * | 2004-03-31 | 2008-11-26 | 大日本印刷株式会社 | Luminance adjustment method for transmission illumination type display board, and transmission illumination type display board whose luminance is adjusted by the method |
| US7621814B2 (en) | 2004-07-22 | 2009-11-24 | Scientific Games International, Inc. | Media enhanced gaming system |
| US7410168B2 (en) | 2004-08-27 | 2008-08-12 | Scientific Games International, Inc. | Poker style scratch-ticket lottery games |
| US7429044B2 (en) | 2004-08-31 | 2008-09-30 | Scientific Games International, Inc. | Scratch-ticket lottery and promotional games |
| CA2588233A1 (en) | 2004-10-11 | 2006-04-20 | Scientific Games Royalty Corp. | Fixed-odds sports lottery game |
| US7631871B2 (en) | 2004-10-11 | 2009-12-15 | Scientific Games International, Inc. | Lottery game based on combining player selections with lottery draws to select objects from a third set of indicia |
| KR20070084102A (en) | 2004-10-28 | 2007-08-24 | 사이언티픽 게임스 인터내셔널, 아이엔씨. | Lottery game played on a geometric figure using indicia with variable point values |
| US7213811B2 (en) | 2004-12-08 | 2007-05-08 | Scientific Games Royalty Corporation | Extension to a lottery game for which winning indicia are set by selections made by winners of a base lottery game |
| US7662038B2 (en) | 2005-01-07 | 2010-02-16 | Scientific Games International, Inc. | Multi-matrix lottery |
| CN101389383A (en) | 2005-01-07 | 2009-03-18 | 科学游戏程序国际有限公司 | Lottery game utilizing nostalgic game themes |
| JP2008526439A (en) | 2005-01-11 | 2008-07-24 | サイエンティフィック ゲイムズ インターナショナル インコーポレイテッド | Online lottery game where you can purchase a selection symbol for a supplementary lottery |
| CN101184541A (en) | 2005-01-21 | 2008-05-21 | 科学游戏程序国际有限公司 | Word-based lottery game |
| US7481431B2 (en) | 2005-02-01 | 2009-01-27 | Scientific Games International, Inc. | Bingo-style lottery game ticket |
| US8262453B2 (en) | 2005-02-09 | 2012-09-11 | Scientific Games International, Inc. | Combination lottery and raffle game |
| US7874902B2 (en) | 2005-03-23 | 2011-01-25 | Scientific Games International. Inc. | Computer-implemented simulated card game |
| WO2006116501A1 (en) | 2005-04-27 | 2006-11-02 | Scientific Games International, Inc. | Game apparatus |
| US7654529B2 (en) | 2005-05-17 | 2010-02-02 | Scientific Games International, Inc. | Combination scratch ticket and on-line game ticket |
| US7371792B2 (en) * | 2005-12-20 | 2008-05-13 | Ppg Industries Ohio, Inc. | Stain compositions and related coated substrates |
| US7829162B2 (en) | 2006-08-29 | 2010-11-09 | international imagining materials, inc | Thermal transfer ribbon |
| US8536087B2 (en) | 2010-04-08 | 2013-09-17 | International Imaging Materials, Inc. | Thermographic imaging element |
| US8460081B2 (en) | 2010-05-14 | 2013-06-11 | Scientific Games International, Inc. | Grid-based multi-lottery game and associated method |
| US8808080B2 (en) | 2010-05-14 | 2014-08-19 | Scientific Games International, Inc. | Grid-based lottery game and associated method |
| US10273050B2 (en) | 2013-06-26 | 2019-04-30 | Glenn Gorab | Container identification mark |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5130804B2 (en) * | 1972-08-12 | 1976-09-03 | ||
| US4225475A (en) * | 1976-08-24 | 1980-09-30 | Borden, Inc. | Basic dye ink |
| US4279659A (en) * | 1976-10-18 | 1981-07-21 | Petrolite Corporation | Laminating composition and uses |
| US4162997A (en) * | 1978-03-02 | 1979-07-31 | Hercules Incorporated | Heat-fusible pastes for printing inks, adhesives and moldings |
| US4244866A (en) * | 1978-09-29 | 1981-01-13 | Inmont Corporation | Calcium resinates and inks |
| US4488646A (en) * | 1979-01-29 | 1984-12-18 | Ludlow Corporation | Tamper-indicating sheet |
| US4472537A (en) * | 1982-09-17 | 1984-09-18 | Corning Glass Works | Thermoplastic inks for decorating purposes |
-
1983
- 1983-02-09 CA CA000421252A patent/CA1183734A/en not_active Expired
-
1984
- 1984-02-08 US US06/578,556 patent/US4536218A/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0358610A2 (en) * | 1988-09-05 | 1990-03-14 | Sicpa Holding S.A. | Printing ink for making erasable prints |
| EP0358610A3 (en) * | 1988-09-05 | 1991-12-27 | Sicpa Holding S.A. | Printing ink for making erasable prints |
| WO1997043126A1 (en) * | 1996-05-14 | 1997-11-20 | The British Printing Company Ltd. | Improved process for the production of scratch-off cards |
Also Published As
| Publication number | Publication date |
|---|---|
| US4536218A (en) | 1985-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1183734A (en) | Process and compositions for lithographic printing in multiple layers | |
| CA2074589C (en) | Water-based scratch-off ink for gaming forms | |
| US4726608A (en) | Information bearing article with tamper resistant scratch-off opaque coating | |
| US8053494B2 (en) | Invisible ink and scratch pad | |
| US5219641A (en) | Thermal transfer image reception coated paper | |
| US5304587A (en) | Water resistant security ink composition | |
| CA2638581C (en) | Improved invisible ink and scratch pad | |
| US4614367A (en) | Tamper-resisting multipart negotiable instruments | |
| US4999334A (en) | Protective coating for thermal images | |
| JPS63500311A (en) | Correction composition for pressure-sensitive chemical recording materials | |
| CA1190987A (en) | Process and compositions for printing in multiple layers | |
| WO2005037905A1 (en) | Invisible ink | |
| US7265077B1 (en) | Latent image developing systems and devices | |
| JPS6044160B2 (en) | Transfer material | |
| US5847024A (en) | Anti-counterfeiting non-yellowing watermark ink | |
| JP5001501B2 (en) | UV curable composition | |
| CA1330177C (en) | Printing ink system for the production of rub-off printings | |
| Rathschlag | Colorants in printing applications | |
| JP2711772B2 (en) | Peelable printed matter | |
| JPH09157573A (en) | Ink for forming information display surface and printed matter | |
| JPH11158797A (en) | ||
| EP0688838B1 (en) | Composition for forming abrasion-removable coatings | |
| JP2514906B2 (en) | Heat transfer sheet | |
| JPH023899Y2 (en) | ||
| JPS63254482A (en) | Copying preventive coating agent and copying preventive sheet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |