CA2040711C - Method for making flexible retroreflective sheet material - Google Patents

Method for making flexible retroreflective sheet material

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Publication number
CA2040711C
CA2040711C CA002040711A CA2040711A CA2040711C CA 2040711 C CA2040711 C CA 2040711C CA 002040711 A CA002040711 A CA 002040711A CA 2040711 A CA2040711 A CA 2040711A CA 2040711 C CA2040711 C CA 2040711C
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CA
Canada
Prior art keywords
sheet material
microprisms
adhesive
flexible
synthetic resin
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 - Fee Related
Application number
CA002040711A
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French (fr)
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CA2040711A1 (en
Inventor
David Charles Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reflexite Corp
Original Assignee
Reflexite Corp
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Filing date
Publication date
Application filed by Reflexite Corp filed Critical Reflexite Corp
Publication of CA2040711A1 publication Critical patent/CA2040711A1/en
Application granted granted Critical
Publication of CA2040711C publication Critical patent/CA2040711C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/12Reflex reflectors
    • G02B5/122Reflex reflectors cube corner, trihedral or triple reflector type
    • G02B5/124Reflex reflectors cube corner, trihedral or triple reflector type plural reflecting elements forming part of a unitary plate or sheet
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06QDECORATING TEXTILES
    • D06Q1/00Decorating textiles
    • D06Q1/10Decorating textiles by treatment with, or fixation of, a particulate material, e.g. mica, glass beads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/003Reflective

Abstract

A flexible retroreflective sheet material is formed by adhering a first face of a first flexible synthetic resin sheet material to a synthetic resin second sheet material by a first adhesive which preferentially adheres to the second sheet material. On the second face of said first sheet material are thereafter formed closely spaced retroreflective microprisms having a height of 0.001-0.010 inches. A second adhesive is applied to the second face of said first sheet and firmly engages therewith. A flexible backing material is adhered to the second adhesive over the second face. Lastly, the second sheet material and first adhesive are stripped from the first sheet material to produce a firmly bonded flexible composite sheet material comprised of the adhesively bonded first sheet material and backing material. The retroreflective microprisms may be coated with a reflective metal deposit or surrounded by air to provide a retroreflective interface.

Description

20~0711 The present invention relates to retroreflective sheeting employing microprism formations to retroreflect the light rays impinging thereon, and, more particularly, to a method for producing flexible retroreflective sheet material which may be readily attached to support structures.
Retroreflective sheet material is widely employed for a variety of safety and decorative purposes, and is particularly useful when the need for night time visibility is significant under conditions of low ambient light. In retroreflective materials, the light rays impinging upon the front surface are reflected back towards the source of the illumination in a substantially parallel path. In situations where headlights or search lights on boats and aircraft are the only source of illumination, this ability to retroreflect the bulk of the rays falling thereon is especially significant for warning signs, delineators and the like.
Minnesota Mining and Manufacturing Corporation has manufactured retroreflective sheeting utilizing minute glass beads embedded in a matrix of synthetic resin to provide such retroreflection, and these materials have been sold under the trademark SCOTCHLITE. Illustrative of such materials is Bergeson et al United States Letters Patent 4,637,950 granted January 20, 1987.
Applicant's assignee, Reflexite Corporation, has been marketing under the trademark REFLEXITE, reflective sheeting employing microprisms formations to produce such retroreflection. Illustrative of such materials is Rowland United States Letters Patent 3,689,346 granted September 5, 1972.
Among the applications for such retroreflective materials are reflective tapes and patches for clothing of firemen, - 20~0~

reflective vests and belts, bands for posts and barrels, traffic cone collars, highway signs, warning reflectors, and the like.
Unfortunately, many of the resins which exhibit long life when exposed to ultraviolet radiation and wide temperature fluctuations also tend to be relatively stiff. As a result, the retroreflective materials made therefrom are difficult to form or have a tendency to crack or craze when repeatedly flexed. Moreover, it is desirable to import fire retardant or resistant properties to the material so that it will function even when exposed to relatively high temperatures.
It is an object of the present invention to provide a novel method for making retroreflective sheeting using microprism formations which is relatively flexible and long lived.
It is also an object of the present invention to provide such a method which produces a retroreflective sheet material which may be readily fabricated and which is durable and readily sewn or otherwise secured to support structures.
Another object of the present invention is to provide such methods for fabricating such retroreflective sheet material which are relatively simple and relatively economical, and which produce long-lived materials.
It has now been found that the foregoing and related objects may be readily attained in a method for making a flexible retroreflective sheet material in which a first face of a first relatively flexible synthetic resin sheet material is adhered to a synthetic resin second sheet material by a first adhesive which preferentially adheres to the second sheet material. The first sheet material has a thickness of 2Q~G711 -0.0001-0.0007 inch and the second sheet material has a thickness of 0.002-0.015 inch. On the second face of the first sheet material are formed closely spaced retroreflective microprisms having a height of 0.001-0.010 inch.
There is then applied to the second face of the first sheet material a second adhesive which firmly engages therewith, and a flexible backing material is adhered to the second adhesive over the second face. The second sheet material and first adhesive are stripped from the first sheet material to produce a firmly bonded flexible composite sheet material comprised of the adhesively bonded first sheet material and backing material.
In one embodiment, a metallic deposit is produced on the surfaces of the microprisms before application of the second adhesive thereto. In a variation of this embodiment, a portion of the metallic deposit is removed to provide a pattern of microprisms which are free from the metallic deposit, and the second adhesive is disposed over the microprisms which have the metallic deposit. This second adhesive spaces the backing member from the microprisms to provide an air interface thereabout. In one variant, the second adhesive is applied to the metallic deposit in a pattern and the metallic deposit not protected thereby is stripped. The second adhesive is preferably applied in a grid pattern.
In another variant, a portion of the metallic deposit is removed to provide a pattern of microprisms which are free from the metallic deposit, and thereafter there is applied to the entire second face a coating of a non-reflective colored second adhesive. Conveniently, the removing step for the 20~0~11 metallic deposit comprises first applying a protective material to the metallic deposit in a pattern and then removing the metallic deposit in the areas unprotected by the protective material.
In the preferred embodiment, the backing material is a fabric, although flexible synthetic resin sheet material may also be employed.
The step of forming the microprisms first involves forming a tie coat of synthetic resin on the second face and thereafter forming the microprisms on the tie coat.
The resultant flexible synthetic resin sheet material comprises a body member of transparent synthetic resin sheet material having a planar first face and a second face with closely spaced synthetic resin retroreflective microprisms thereover. The body member has a thickness from the first face to the base of the microprisms of 0.0002-0.001 inch and the microprisms have a height of 0.001-0.010 inch. An adhesive coating on the second face and over at least some of the microprism has bonded thereto a flexible backing member.
At least 40 percent of microprisms have a retroreflecting interface at their surface.
Figure 1 is a partially diagrammatic illustration of an early step in one embodiment of a process for forming a retroreflective material embodying the present invention;
Figure 2 is a similar illustration of a subsequent step in the process in which microprism formations have been formed thereon and are being cured in a mold by exposure to radiation;
Figure 3 is a similar illustration of a subsequent step in which a reflective metallic deposit has been formed on all the microprism formations;
2~0~11 Figure 4 is a similar illustration wherein a protective coating has been formed on the deposit in a pattern;
Figure 5 is a similar illustration in which the material of Figure 4 is shown in contact with a solvent for the unprotected metallic deposit:
Figure 6 is a similar illustration showing the material with the metallic deposit removed in the areas not protected by the coating;
Figure 7 is a similar illustration showing a colored adhesive coating material deposited over the entire surface of the sheet material and a fabric layer adhered thereto;
Figure 8 is a similar illustration showing the removal of the carrier sheeting;
Figure 9 is a fragmentary plan view of a grid pattern of the protective coating on the microprism face as formed in Figure 4;
Figure 10 is a diagrammatic view of the finished sheet material showing the path of light rays impinging upon the front face; and Figure 11 is a fragmentary cross sectional view of another embodiment of the retroreflective material of the present invention.
Turning first to Figure 1, therein a thin flexible sheet material body member 10 is being temporarily laminated to a relatively thick carrier sheet 12 by an adhesive layer 14 which preferentially adheres to the carrier sheet 12. In this step, the thick carrier sheet 12 has been precoated with the adhesive 14 and is passed through the nip of a pair of laminating rollers 16, 18 with the body member lO.
In the next step (not shown), the lower or opposite surface of the body member 10 is provided with a thin tie coat 20 of synthetic resin. As seen in Figure 2, this coated laminate is then pressed against the surface of a mold 22 with closely spaced microprism recesses 24 in which is deposited a fluid synthetic resin composition. The assembly is exposed to ultraviolet rays from the lamps 28 to cure the fluid resin composition to form microprism formations 26 on the surface of body member 10.
In the illustrated embodiment of the process, the sheet material is stripped from the surface of the mold 22 and is then vacuum metallized or otherwise treated to form a reflective metallic deposit 30 on the surface of the microprism formations 26, as seen in Figure 3.
In the next step, and as seen in Figures 4 and 9, a coating 32 of a protective material is applied in a grid pattern over the metallic deposit 30 on the microprisms 26.
In Figure 5, the coated surface is shown as being exposed to a solvent 34 for the metallic deposit 30 which removes the deposit in the unprotected areas. This leaves the reflective metallic deposit 30 only in those areas underlying the protective coating 32 as seen in Figure 6.
In Figure 7, the laminate is shown as bonded to a flexible fabric 36 by a coating 38 of colored adhesive disposed over the entire surface of the microprism face.
Thus, this coating 38 is in direct contact with those microprisms 26 which do not have the metallic deposit 30 and protective coating 32.
In Figure 8, the carrier 12 and its adhesive bonding layer 14 are shown as being stripped from the fabric supported microprism material.

As seen in Figure 10, those light rays 40a impinging upon the front face 42 of the retroreflective material which pass 8 2 ~

through the body member 10 and tie coat 20 into the microprisms 24 with the metallic deposit 30 impinge upon the retroreflective interface and are redirected from the surfaces of the microprisms 26 in a substantially parallel path. Those light rays 40b impinging upon the front face 42 which enter the microprisms 26 having their surfaces in direct contact with the colored adhesive 38 are refracted at that interface and are scattered at different angles thereby and provide a visual coloration to the retroreflective material in ambient light or daylight which is that of the colored adhesive 38.
In Figure 11, another embodiment of the present invention is illustrated and in which an air interface is employed for the retroreflection. The colored adhesive 38 is applied in a grid pattern to a height above the prisms 26 and the fabric 36 is thereby spaced above the tips of the prisms to provide a retroreflective air interface about the prisms 26.
As previously indicated, the microprisms are closely spaced and can be described as cube corner formations.
Details concerning the structure and operation of such microprisms may be found in Rowland United States Letters Patent 3,684,348 granted August 15, 1972. These microprisms or cube corner formations may have a side edge dimension of up to 0.025 inch, but the preferred structures use edge dimensions of not more than 0.010 inch, and most desirably on the order of 0.004-0.008 inch.
The body member of the sheeting will generally have a thickness on the order of 0.0001-0.0007 inch and preferably about 0.0002-0.0004 inch when a highly flexible laminate is to be formed and, depending upon the method of fabrication, the resins, and other characteristics desired for the retroreflective sheeting.

~- 204~71 l The microprism sheeting may be formed by casting prisms upon a film surface functioning as the body, or by embossing a preformed sheeting, or by casting both body and prisms concurrently. Generally, the resins employed for the microprism sheeting are cross linked thermoplastic formulations, and desirably these resins provide flexibility, light stability, and good weathering characteristics. In some instances, the front face of the retroreflective sheeting may be provided with a protective coating such as by application of a lacquer or other coating material. Suitable resins for the retroreflective sheeting include vinyl chloride polymers, polyesters, polycarbonates, methyl methacrylate polymers, polyurethanes and acrylated urethanes.
To protect the relatively thin body member during processing, the relatively thick carrier temporarily bonded thereto will generally have a thickness of 0.005-0.008 inch.
The adhesive used to effect the bonding therebetween preferentially adheres to the carrier and is conveniently a silicone adhesive applied to a thickness of about 0.00025-0.0005 inch. When ultraviolet curing of the resin in the prisms is employed, the adhesive must be transparent to the light rays. Although various resins may be employed for the carrier, polyesters, and particularly polyethylene terepthalate, are desirably employed because of their toughness and relative resistance to processing conditions.
As with the adhesive, the carrier should be transparent to the ultraviolet radiation used to effect curing. Moreover, the surface of the carrier may be treated to enhance the preferential adhesion of the adhesive to the surface of the carrier.

- --Ib- 2U40711 A particularly advantageous method for making such retroreflective sheeting is described and claimed in Rowland United States Letter Patent No. 3,689,346 granted September 5, 1972 in which the cube corner formations are cast in a cooperatively configured mold and are bonded to sheeting which is applied thereover to provide a composite structure in which the cube corner formations project from the one surface of the sheeting.
Another method for fabricating such microprism sheeting is shown in Rowland United States Patent No. 4,244,683 granted January 13, 1981 in which the cube corner formations are produced by embossing a length of sheeting in suitable embossing apparatus with precisely formed molds in a manner which avoids entrapment of air.
The latter method has been used for forming sheeting of acrylic and polycarbonate resins while the former method has proven highly advantageous for forming retroreflective sheeting from polyvinyl chloride resins and, more recently, polyester body members with prisms of various resin formulations including acrylated epoxy oligomers. Although the carrier concept of the present invention is useful in both types of operation, it is particularly beneficial in producing sheeting using thin polyester and like films which, while strong, might be damaged during the processing steps prior to its being supported by the flexible backing.
It is customary to provide a backing sheet behind the microprisms so as to protect them and to provide a smooth surface for application of the structure to support surfaces.
To effect lamination of such a backing sheet to the retroreflective sheeting, adhesives and ultrasonic welding have generally been employed.

_ ,~ 20~0~11 As is known, the reflective interface for the prisms may be provided by a reflective coating or by an air interface.
In the preferred embodiment of the present invention, a reflective coating is provided upon the surfaces of at least some of the microprisms, and such reflective coatings have most commonly been vacuum metallized aluminum deposits, although metallic lacquers and other specular coating materials have also been used.
In one embodiment, the vacuum metallized prism surface is printed in a coating apparatus with a grid-like pattern of a protective coating material as indicated by the numeral 32 in Figures 4 and 9. In this grid pattern, there is a composite of underlying metal deposit 30 and overlying coating material 32. The coating matexial may be an adhesive, or a lacquer, or any other readily applied coating material which is essentially inert to the intended solvent bath.
The coated surface is subjected to treatment in a bath 34 of a solvent for the deposited metal, as shown by the numeral 16 in Figure S. This bath is conveniently a mild caustic solution which will dissolve an aluminum deposit. The portion of the metal coating 30 which is not protected by the second coating material 32 is removed by the solvent in this step so as to leave the prisms 30 within the areas bounded by the grid free from any coating.
In the preferred process in which the metal deposit is to be removed in those areas where it is not protected, the solvent conveniently comprises a solution of alkali metal hydroxide or other alkaline solution which will dissolve the aluminum. In the instance of coatings other than metals, solutions with which the material will react or in which it will dissolve, are employed.

20~0~1 The colored coating material may be a colored lacquer applied to the surface of the sheeting, a colored adhesive, or any other colored deposit which will coat the prism surfaces.
Conveniently, a colored adhesive is employed since this will enable bonding of the backing material thereto.
A retroreflective material utilizing some prisms which have air interfaces and others which utilize reflective coatings offer some advantages and is described in detail in Martin United States Patent No. 4,801,193 granted January 31, 1989.
If so desired, retroreflective sheeting could be produced by applying the backing material to the partially metallized material so as to maintain the air interface in the uncoated areas.
To produce a sheeting which exhibits a coloration, a colored coating is then applied over the entire prism surface and directly coats the unmetallized prisms. Thereafter, the backing material is applied.
In the alternate embodiment using an air interface, a colored adhesive is applied in a pattern to the prism surface and to a depth greater than the height of the prisms. When the backing element is laminated thereto, it is spaced from the prisms by the adhesive and this provides an air interface about the uncoated prisms.
The backing sheet may be a woven or laid fabric, or a flexible, durable polymeric material. Suitable resins include polyethylene, polypropylene, polyurethanes, acrylated polyurethanes and ethylene/vinyl acetate copolymers.
Polyester and urethane fabrics may be employed as well as those of natural fibers such as cotton. Flame retardants may 20407il - --l3 be incorporated in the adhesives as well as in the fabric or resin backing to impart flame retardance to the retroreflective material.
Although other metals may be used to provide a specular metal deposit including silver, rhodium, copper, tin, zinc, and palladium, the preferred and most economical processes utilize aluminum vacuum deposition. Other deposition techniques include electroless plating, electroplating, ion deposition and sputter coating.
The protective coating material is desirably a pressure sensitive adhesive which will not be unduly affected in the solvent treating step, and it may be the same adhesive as employed as the means for bonding the backing member.
Preferred adhesives include rubber based systems such as isobutylene in a solvent carrier and acrylic-based adhesives and silicones in solvent systems. Other adhesives may also be employed, and water based systems may also be used although sometimes requiring drying time before further processing.
Specific examples of suitable adhesive systems are a rubber based, resin modified adhesive sold by B.F. Goodrich under the designation A1569-B, a latex rubber-based adhesive sold by Emhart Industries, Bostik Division, under the designation 8786X and a latex rubber-based system sold by B. F. Goodrich under the designation 26171, and a pressure sensitive silicone resin adhesive in a solvent sold by Dow under the designation QZ-7406.
Whether using solvent-based or water based systems, the coating may require drying before further processing. If so, heating may be utilized to accelerate the process.
The step of adhering the backing to the retroreflective sheeting may simply involve passing the adhesively coated retroreflective sheeting through the nip of a pair of rolls together with the backing material to apply the necessary pressure to effect adhesion. If a heat activatable adhesive is employed, the retroreflective sheeting may be subjected to preheating prior to passage through the rolls, or the rolls may be heated to achieve the necessary activation. However, it is also practicable to employ ultrasonic welding and other techniques to bond the backing material to the retroreflective sheeting by the material of the backing material itself when it is thermoplastic.
To provide a coloration to the retroreflective light at night, a dye may be incorporated in the resin used to form the body member, or the tie coat, or even the prisms. As an alternative to a dye and as an effective necessity in some resin systems, the coloration may be provided as a finely divided pigment which is well dispersed; however, some loss in retroreflectivety will occur as the result of refraction by pigment particles which are directly in the path of light rays.
Illustrative of the present invention is the following example.
EXAMPLE ONE
Utilizing the method generally illustrated in Rowland United States Patent ~o. 3,689,346, microprisms having a height of 0.0028 inch and a spacing of about 0.006 inch on center are cast upon a polyester film having a thickness of 0.0005 inch, and coated with a tie coat of a solution of polyester resin. The thin polyester film is temporarily bonded to a carrier of surface treated polyester film having a thickness of 0.002 inch by a silicone adhesive. The resin 20~0711 employed for casting the prisms is an acrylated epoxy oligomer modified with monofunctional and trifunctional acrylic monomers and containing a cross linking catalyst.
The retroreflective sheeting is vacuum metallized with aluminum to a thickness in excess of 240 Angstroms. The metallized sheeting is then imprinted by a modified gravure roll with a grid pattern of a pressure sensitive, ever-tacky isobutylene rubber based adhesive. The grid has a spacing of 1/4 inch between lines and the lines have a thickness of approximately 0.04 inch.
Following printing of the grid pattern, the sheeting is passed through a 1.0 M. solution of sodium hydroxide for a period of 10-30 seconds during which the unprotected aluminum deposit is removed. The sheeting is then passed through a water bath to rinse the surface, and thence through a dryer.
The sheeting is coated with a red pigmented silicone adhesive containing a bromine flame retardant to a thickness of about 0.004 inch or about 0.0015 inch above the tops of the prisms.
The coated sheet material is then passed through the nip of laminating rollers together with a woven cotten fabric treated with a flame retardant and having a thickness of about 0.006 inch to effect the lamination thereto. Thereafter, the carrier and its adhesive are stripped from the retroreflective sheeting.
Upon visual inspection, the retroreflective material is flexible and may be conformed easily to clothing and the like.
It may be readily sewn to fabric and adhesively bonded to various substrates. The sheet material exhibits a red coloration in daylight. When exposed to a beam of directional incandescent light, it retroreflects brightly in a white/grey coloration.

20~S711 .

Thus, it can be seen from the foregoing detailed specification and the attached drawings that the method of the present invention produces a retroreflective material which is highly flexible and which may be readily secured to clothing and the like. It has a high retroreflectivity when exposed to directional light sources at night. The material may be readily fabricated, is relatively durable, and may be made substantially resistant to the elements to which it may be exposed.

Claims (17)

1. In a method for making a flexible retroreflective sheet material, the steps comprising (a) adhering a first face of a first relatively flexible synthetic resin sheet material to a synthetic resin second sheet material by a first adhesive which preferentially adheres to said second sheet material, said first sheet material having a thickness of 0.0001-0.0007 inch and said second sheet material having a thickness of 0.002-0.015 inch;
(b) molding on the second face of said first sheet material closely spaced retroreflective microprisms having a height of 0.001-0.010 inch;
(c) applying to said second face of said first sheet material upon which such microprisms have been molded, a second adhesive which is firmly engaged therewith;
(d) adhering to said second adhesive over said second face a flexible backing material; and (e) stripping said second sheet material and said first adhesive from said first sheet material to produce a firmly bonded flexible composite sheet material comprised of the adhesively bonded first sheet material and backing material.
2. The method of making flexible retroreflective sheet material in accordance with Claim 1 wherein there is included the step of producing a metallic deposit on the surfaces of said microprisms before application of said second adhesive thereto.
3. The method of making flexible retroreflective sheet material in accordance with Claim 2 wherein there is included the step of removing a portion of the metallic deposit to provide a pattern of microprisms which are free from said metallic deposit and wherein said second adhesive is disposed over the microprisms which have said metallic deposit, said second adhesive spacing said backing member from said microprisms free from said metallic deposit to provide an air interface thereabout.
4. The method of making flexible retroreflective sheet material in accordance with Claim 3 wherein said second adhesive is applied to said metallic deposit in a pattern and the metallic deposit not protected thereby is stripped.
5. The method of making flexible retroreflective sheet material in accordance with Claim 3 wherein said second adhesive is applied in a grid pattern.
6. The method of making flexible retroreflective sheet material in accordance with Claim 2 wherein there is included the steps of removing a portion of the metallic deposit to provide a pattern of microprisms which are free from said metallic deposit and thereafter applying to the entire second face a coating of a non-reflective colored second adhesive.
7. The method of making flexible retroreflective sheet material in accordance with Claim 6 wherein the step of removing said metallic deposit comprises first applying a protective material to said metallic deposit in a pattern and then removing the metallic deposit in the areas unprotected by said protective material.
8. The method of making flexible retroreflective sheet material in accordance with Claim 1 wherein said backing material is a fabric.
9. The method of making flexible retroreflective sheet material in accordance with Claim 1 wherein said backing material is a flexible synthetic resin sheet material.
10. The method of making flexible retroreflective sheet material in accordance with Claim 1 wherein said step of forming said microprisms includes initially providing a tie coat of synthetic resin on said second face and thereafter forming said microprisms on said tie coat.
11. A flexible synthetic resin sheet material comprising:
(a) a relatively flexible body member of transparent synthetic resin sheet material having a thickness of 0.0001-0.0007 inch, said sheet material having a planar first face and a second face with closely spaced synthetic resin retroreflective microprisms molded thereon, said body member having a thickness from said first face to the base of said microprisms of 0.0001-0.0007 inch and said microprisms having a height of 0.001-0.010 inch;
(b) an adhesive coating on said second face and over at least some of said microprisms thereof; and (c) a flexible backing member extending over said second face and bonded thereto by said adhesive coating, at least 40 percent of said microprisms having a retroreflecting interface at their surface.
12. The flexible synthetic resin sheet material in accordance with Claim 11 wherein there is included a reflective metallic deposit on at least some of said microprisms to provide said retroreflecting interface.
13. The flexible synthetic resin sheet material in accordance with Claim 12 wherein said reflective metallic deposit is in a grid pattern.
14. The flexible synthetic resin sheet material in accordance with Claim 12 wherein said adhesive coating is on said metallic deposit and spaces said backing material from the microprisms which are free from said deposit to provide a retroreflective air interface.
15. The flexible synthetic resin sheet material in accordance with Claim 13 wherein said adhesive is a colored material covering the microprisms not in said grid pattern.
16. The flexible synthetic resin sheet material in accordance with Claim 11 wherein said coating is a non-reflective colored material.
17. The flexible synthetic resin sheet material in accordance with Claim 11 wherein said backing member is a fabric.
CA002040711A 1990-05-16 1991-04-17 Method for making flexible retroreflective sheet material Expired - Fee Related CA2040711C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/525,244 1990-05-16
US07/525,244 US5264063A (en) 1990-05-16 1990-05-16 Method for making flexible retroreflective sheet material

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CA2040711A1 CA2040711A1 (en) 1991-11-17
CA2040711C true CA2040711C (en) 1996-01-02

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US (1) US5264063A (en)
JP (1) JP2647281B2 (en)
CA (1) CA2040711C (en)
DE (1) DE4115822C2 (en)
FR (1) FR2662268B1 (en)
GB (1) GB2245219B (en)

Families Citing this family (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5759330A (en) * 1992-03-26 1998-06-02 Sir Harry Flashman & Associates, A Division Of Francis De Neefe Holdings Pty. Ltd. Method for making a retro-reflective identification plate
US5831766A (en) * 1993-02-17 1998-11-03 Reflexite Corporation Retroreflective structure
US5637173A (en) * 1993-02-17 1997-06-10 Reflexite Corporation Method for forming a retroreflective structure having free-standing prisms
WO1995003558A1 (en) * 1993-07-19 1995-02-02 Reflexite Corporation Retroreflective structure
US5648145A (en) * 1993-09-10 1997-07-15 Reflexite Corporation Fire-resistant, retroreflective structure
US5450235A (en) 1993-10-20 1995-09-12 Minnesota Mining And Manufacturing Company Flexible cube-corner retroreflective sheeting
US5691846A (en) * 1993-10-20 1997-11-25 Minnesota Mining And Manufacturing Company Ultra-flexible retroreflective cube corner composite sheetings and methods of manufacture
US6318867B1 (en) 1993-10-20 2001-11-20 3M Innovative Properties Company Conformable cube corner retroreflective sheeting
US5614286A (en) * 1993-10-20 1997-03-25 Minnesota Mining And Manufacturing Company Conformable cube corner retroreflective sheeting
WO1995031739A1 (en) * 1994-05-12 1995-11-23 Minnesota Mining And Manufacturing Company Retroreflective article and method of making same
US5512219A (en) * 1994-06-03 1996-04-30 Reflexite Corporation Method of casting a microstructure sheet having an array of prism elements using a reusable polycarbonate mold
US5501545A (en) * 1994-11-09 1996-03-26 Reflexite Corporation Retroreflective structure and road marker employing same
US6143224A (en) * 1995-05-18 2000-11-07 Reflexite Corporation Method for forming a retroreflective sheeting
US6139158A (en) * 1995-07-26 2000-10-31 Reflexite Corporation Retroreflective articles with multiple size prisms in multiple locations
US20030170426A1 (en) * 1995-12-01 2003-09-11 W. Scott Thielman Cellular retroreflective sheeting
US5870643A (en) * 1995-12-28 1999-02-09 Eastman Kodak Company Single-use flash cameras with reflector or siren
USD383312S (en) * 1996-01-19 1997-09-09 Minnesota Mining And Manufacturing Company Seal pattern on retroreflective sheeting
US5706132A (en) * 1996-01-19 1998-01-06 Minnesota Mining And Manufacturing Company Dual orientation retroreflective sheeting
CH690442A5 (en) * 1996-03-07 2000-09-15 Schlaepfer & Co Ag A process for the manufacture of a decorative element on textiles, as well as produced by the process decoration element
US5814355A (en) * 1996-04-30 1998-09-29 Minnesota Mining And Manufacturing Company Mold for producing glittering cube-corner retroreflective sheeting
JP3580999B2 (en) 1997-11-17 2004-10-27 日本カーバイド工業株式会社 Triangular pyramidal cube corner retroreflective sheet
US6036322A (en) * 1997-12-01 2000-03-14 Reflexite Corporation Multi-orientation retroreflective structure
CN1134676C (en) * 1997-12-16 2004-01-14 瑞弗莱克塞特公司 Perforated retroreflective film
US6481857B2 (en) * 1997-12-16 2002-11-19 Reflexite Corporation Perforated retroreflective film
US6398287B1 (en) 1998-02-20 2002-06-04 Reflexite Corporation Retroreflective reinforcement webbing applied to an outer side of a tarpaulin
US6139928A (en) * 1998-06-18 2000-10-31 Printmark Industreis, Inc. Three-dimensional applique
AU771338B2 (en) * 1999-01-21 2004-03-18 Orafol Americas Inc. Durable, open-faced retroreflective prismatic construction
US20050185279A1 (en) * 1999-01-21 2005-08-25 Reflexite Corporation Durable, open-faced retroreflective prismatic construction
DE19934611C2 (en) * 1999-07-23 2002-03-28 Kautex Textron Gmbh & Co Kg Plastic sheets for strip curtains and gates
JP3975039B2 (en) 1999-12-13 2007-09-12 日本カーバイド工業株式会社 Triangular pyramid cube corner retroreflective element
EP1271189A4 (en) * 2000-01-31 2010-02-24 Nippon Carbide Kogyo Kk Triangular pyramidal cube corner retroreflection element
JP3468418B2 (en) * 2000-03-15 2003-11-17 日本カーバイド工業株式会社 Triangular pyramidal cube corner retroreflective sheet
US6325515B1 (en) 2000-03-21 2001-12-04 3M Innovative Properties Company Cube corner retroreflective article with enhanced pigmentation
JP4028155B2 (en) * 2000-04-11 2007-12-26 日本カーバイド工業株式会社 Fluorescent retroreflective sheet
WO2002063392A1 (en) * 2001-02-07 2002-08-15 Corning Incorporated Self-aligned aperture masks having high definition apertures
US6592967B2 (en) 2001-02-14 2003-07-15 Avery Dennison Corporation Microprism reflective sheeting with improved retention of reflectivity
ATE473491T1 (en) * 2001-06-19 2010-07-15 Nippon Carbide Kogyo Kk REFLECTIVE PRODUCT INCLUDING AN INTEGRATED CIRCUIT
US6931665B2 (en) 2001-07-30 2005-08-23 3M Innovative Properties Company Vapor permeable retroreflective garment
CA2456611C (en) * 2001-08-09 2010-09-21 Nippon Carbide Kogyo Kabushiki Kaisha Retroreflective device
US7010212B2 (en) * 2002-05-28 2006-03-07 3M Innovative Properties Company Multifunctional optical assembly
MXPA05003670A (en) * 2002-10-08 2005-06-08 Nippon Carbide Kogyo Kk Recursive-reflection display device.
US20040146677A1 (en) * 2003-01-24 2004-07-29 3M Innovative Properties Company Flexible reflective sleeve
EP1614299A1 (en) 2003-04-16 2006-01-11 Upstream Engineering Oy 2d/3d data projector
FI118991B (en) 2004-02-09 2008-06-13 Upstream Engineering Oy A method for manufacturing three-dimensional optical components
WO2005075182A1 (en) * 2004-02-09 2005-08-18 Upstream Engineering Oy Method for manufacturing three dimensional optical components
US7448273B2 (en) * 2004-11-16 2008-11-11 Hewlett-Packard Development Company, L.P. Effecting dynamic measurement of low mass devices
KR20130008643A (en) * 2004-12-28 2013-01-22 쓰리엠 이노베이티브 프로퍼티즈 컴파니 Prismatic retroreflective article with fluorine- or silicon-containing prisms
US7195360B2 (en) * 2004-12-28 2007-03-27 3M Innovative Properties Company Prismatic retroreflective article and method
US20070237578A1 (en) * 2006-03-31 2007-10-11 3M Innovative Properties Company Flexible sleeve
US7374297B2 (en) * 2006-03-31 2008-05-20 Reflexite Corporation Conformable retroreflective film structure
AU2007283578A1 (en) 2006-08-10 2008-02-14 Upstream Engineering Oy Illuminator method and device
US20080176972A1 (en) * 2007-01-19 2008-07-24 David Hews Radiation cured elastomeric urethane acrylate films and the process for making same
US7547105B2 (en) 2007-07-16 2009-06-16 3M Innovative Properties Company Prismatic retroreflective article with cross-linked image layer and method of making same
US9721825B2 (en) 2008-12-02 2017-08-01 Arizona Board Of Regents, A Body Corporate Of The State Of Arizona, Acting For And On Behalf Of Arizona State University Method of providing a flexible semiconductor device and flexible semiconductor device thereof
US9601530B2 (en) 2008-12-02 2017-03-21 Arizona Board Of Regents, A Body Corporated Of The State Of Arizona, Acting For And On Behalf Of Arizona State University Dual active layer semiconductor device and method of manufacturing the same
SG171917A1 (en) 2008-12-02 2011-07-28 Univ Arizona Method of preparing a flexible substrate assembly and flexible substrate assembly therefrom
US9991311B2 (en) 2008-12-02 2018-06-05 Arizona Board Of Regents On Behalf Of Arizona State University Dual active layer semiconductor device and method of manufacturing the same
TW201117262A (en) 2009-05-29 2011-05-16 Univ Arizona Method of providing a flexible semiconductor device at high temperatures and flexible semiconductor device thereof
EP2470931B1 (en) * 2009-08-25 2016-03-09 Avery Dennison Corporation Retroreflective article
CN102236445A (en) * 2010-04-26 2011-11-09 胜华科技股份有限公司 Composite board structure and cover mirror laminar structure for touch panel
WO2012021197A2 (en) 2010-05-21 2012-02-16 Arizona Board Of Regents, For And On Behalf Of Arizona State University Method of manufacturing electronic devices on both sides of a carrier substrate and electronic devices thereof
WO2012021196A2 (en) 2010-05-21 2012-02-16 Arizona Board Of Regents, For And On Behalf Of Arizona State University Method for manufacturing electronic devices and electronic devices thereof
US20120325585A1 (en) * 2011-06-24 2012-12-27 Trans-Tech LLC Reflective Friction-Enhancement For Surfaces
GB2493369B (en) 2011-08-02 2013-09-25 Rue De Int Ltd Improvements in security devices
CN103192554A (en) * 2013-04-07 2013-07-10 福建省晋江市夜光达反光材料有限公司 Microprism reflective membrane and manufacturing method thereof
JP6890011B2 (en) 2013-08-19 2021-06-18 スリーエム イノベイティブ プロパティズ カンパニー Retroreflective sheet material including low modulus layer
JP6890012B2 (en) 2013-08-19 2021-06-18 スリーエム イノベイティブ プロパティズ カンパニー Retroreflective sheet material with a substantially amorphous polymer layer
US10451780B2 (en) * 2013-12-12 2019-10-22 3M Innovative Properties Company Retroreflective article
WO2015156891A2 (en) 2014-01-23 2015-10-15 Arizona Board Of Regents, Acting For And On Behalf Of Arizona State University Method of providing a flexible semiconductor device and flexible semiconductor device thereof
WO2017034644A2 (en) 2015-06-09 2017-03-02 ARIZONA BOARD OF REGENTS a body corporate for THE STATE OF ARIZONA for and on behalf of ARIZONA STATE UNIVERSITY Method of providing an electronic device and electronic device thereof
US10381224B2 (en) 2014-01-23 2019-08-13 Arizona Board Of Regents On Behalf Of Arizona State University Method of providing an electronic device and electronic device thereof
CN106663640B (en) 2014-05-13 2020-01-07 代表亚利桑那大学的亚利桑那校董会 Method of providing an electronic device and electronic device thereof
US9741742B2 (en) 2014-12-22 2017-08-22 Arizona Board Of Regents, A Body Corporate Of The State Of Arizona, Acting For And On Behalf Of Arizona State University Deformable electronic device and methods of providing and using deformable electronic device
US10446582B2 (en) 2014-12-22 2019-10-15 Arizona Board Of Regents On Behalf Of Arizona State University Method of providing an imaging system and imaging system thereof
US11246366B2 (en) 2017-05-31 2022-02-15 Nike, Inc. Selective deposition of reflective materials for an apparel item
EP3702816A1 (en) * 2019-02-28 2020-09-02 D. Swarovski KG Decorative composite body
CN112684528A (en) * 2020-12-29 2021-04-20 福建夜光达科技股份有限公司 Reflective shell and preparation method thereof, and reflective integrated helmet comprising reflective shell and preparation method thereof

Family Cites Families (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1805224A (en) * 1928-03-16 1931-05-12 American Gasaccumulator Co Reflector and method of providing the reflecting surface thereof with means for coloring the light reflected therefrom
US2167149A (en) * 1937-08-20 1939-07-25 Nat Colortype Company Total reflecting prism sheet
US2481757A (en) * 1945-05-23 1949-09-13 Thoger G Jungersen Optical reflecting material
US3253146A (en) * 1962-08-16 1966-05-24 Prismo Safety Corp Fluorescent marker pigment for roadways
USB322986I5 (en) * 1963-01-04
US3420597A (en) * 1964-04-13 1969-01-07 Minnesota Mining & Mfg Retroreflective structure and method of making same
US3374044A (en) * 1964-11-03 1968-03-19 Gen Dynamics Corp Filtered wave-energy corner-reflector
US3493286A (en) * 1965-12-29 1970-02-03 William Garwood Bacon Jr Reflex light reflector
US3924929A (en) * 1966-11-14 1975-12-09 Minnesota Mining & Mfg Retro-reflective sheet material
US3496006A (en) * 1966-12-02 1970-02-17 Prismo Safety Corp Method of producing reflective marker
US3567307A (en) * 1966-12-02 1971-03-02 Prismo Universal Corp Reflective markers
US3607344A (en) * 1967-11-17 1971-09-21 Wyomissing Corp Fluorescent coatings
US3614199A (en) * 1968-07-03 1971-10-19 Gerald Altman Reflex reflecting products, processes and devices useful with such products
US3713939A (en) * 1970-03-04 1973-01-30 Polymer Corp Method of processing articles of very thin plastic film material
US3684348A (en) * 1970-09-29 1972-08-15 Rowland Dev Corp Retroreflective material
US3689346A (en) * 1970-09-29 1972-09-05 Rowland Dev Corp Method for producing retroreflective material
US3700305A (en) * 1970-12-14 1972-10-24 Minnesota Mining & Mfg Retroreflective microspheres having a dielectric mirror on a portion of their surface and retroreflective constructions containing such microspheres
US3802944A (en) * 1972-04-17 1974-04-09 Minnesota Mining & Mfg Retroreflective sheeting
US3811983A (en) * 1972-06-23 1974-05-21 Rowland Dev Corp Method for producing retroreflective sheeting
US3830682A (en) * 1972-11-06 1974-08-20 Rowland Dev Corp Retroreflecting signs and the like with novel day-night coloration
US3975083A (en) * 1974-07-24 1976-08-17 Reflexite Corporation Wide angle retroreflector assembly and method of making same
USRE30892E (en) * 1975-01-10 1982-03-30 Minnesota Mining And Manufacturing Company Area-retroreflectorization of fabrics
US4025159A (en) * 1976-02-17 1977-05-24 Minnesota Mining And Manufacturing Company Cellular retroreflective sheeting
US4099838A (en) * 1976-06-07 1978-07-11 Minnesota Mining And Manufacturing Company Reflective sheet material
US4082426A (en) * 1976-11-26 1978-04-04 Minnesota Mining And Manufacturing Company Retroreflective sheeting with retroreflective markings
US4153412A (en) * 1977-04-25 1979-05-08 Minnesota Mining And Manufacturing Company Process for printing reflective sheet material
US4145112A (en) * 1977-07-14 1979-03-20 Minnesota Mining And Manufacturing Company Low-profile raised retroreflective sheeting
JPS5812868A (en) * 1981-07-14 1983-01-25 Toyoda Mach Works Ltd Steering pressure regulator for power steering
AU552779B2 (en) * 1983-09-18 1986-06-19 Stimsonite Corporation Retroreflective laminate sheeting
JPS60163419A (en) * 1984-02-06 1985-08-26 東レ株式会社 Deposited laminated film for capacitor
US4555161A (en) * 1984-02-16 1985-11-26 Reflexite Corporation Encapsulated retroreflective material and method of making same
US4618518A (en) * 1984-08-10 1986-10-21 Amerace Corporation Retroreflective sheeting and methods for making same
US4637950A (en) * 1985-05-01 1987-01-20 Minnesota Mining And Manufacturing Company Delamination-resistant cellular retroreflective sheeting
CA1273687A (en) * 1986-01-31 1990-09-04 William C. Mooney Press-fit pin for circuit board connection
US4763985A (en) * 1986-08-01 1988-08-16 Minnesota Mining And Manufacturing Company Retroreflective sheet with enhanced brightness
US4801193A (en) * 1988-03-04 1989-01-31 Reflexite Corporation Retroreflective sheet material and method of making same

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FR2662268B1 (en) 1993-12-24
FR2662268A1 (en) 1991-11-22
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DE4115822C2 (en) 1997-06-19
US5264063A (en) 1993-11-23

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