|Publication number||US3900632 A|
|Publication date||19 Aug 1975|
|Filing date||3 Apr 1972|
|Priority date||27 Feb 1970|
|Publication number||US 3900632 A, US 3900632A, US-A-3900632, US3900632 A, US3900632A|
|Inventors||Robinson James E|
|Original Assignee||Kimberly Clark Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (13), Referenced by (127), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 1 Robinson Aug. 19, 1975 1 LAMINATE OF TISSUE AND RANDOM LAID CONTINUOUS FILAMENT WEB  lnventor: James E. Robinson, Crescent Drive,
 Assignee: Kimberly-Clark Corporation,
Neenah. Wis. a
22] Filed: Apr.3, 1972  Appl. No.: 240,754
Related U.S. Application Data  Continuation-impart of Ser. No. 15,033, Feb. 27,
2,902,395 9/1959 Hirschy et a1 161/129 3,025,199 3/1962 Harwood 161/129 3.063.454 11/1962 Coates et al.. 161/150 3,276,944 10/1966 Levy 161/150 3,327,708 6/1967 Sokolowski... 161/128 3,341,394 9/1967 Kinney 161/150 3,368,934 2/1968 Vosburgh 161/148 3,424,643 1/1969 Lewis et al.... 161/150 3,509,009 4/1970 I-Iartmann 161/150 3,708,383 1/1973 Thomas et a1. 161/146 FOREIGN PATENTS OR APPLICATIONS 803.714 3/1963 Canada [5 7 ABSTRACT Laminates comprising cellulose wadding and a web of continuous thermoplastic filaments are disclosed. The
laminates have a good hand, are strong, attractive in appearance, and absorb and retain fluid.
11 Claims, 3 Drawing Figures LAMINATE OF TISSUE AND RANDOM LAID CONTINUOUS FILAMENT WEB Laminate of Tissue and Random Laid Continuous Filament Web and which application is now abandoned.
DESCRIPTION o rHE INVENTION This invention relates to nonwoven fabrics and, more particularly, to lightweight nonwoven laminates including websof continuous thermoplastic filaments.
Nonwoven webs comprised of a plurality of continuous filaments of synthetic polymers arenow widely known. As opposed to webs made by conventional spinning, weaving or knitting operations, webs of continuous filaments are generally prepared by continuous polymer extrusion and immediate deposition on .a supporting surface in a generally random manner. Ordinarily, in order to achieve fiber tenacity, the filaments are molecularly oriented after extrusion and prior to deposition on the supporting surface. U.S. Pat. Nos. 3,338,992 and 3,341,394 to Kinney illustrate types of continuous filament nonwoven webs.
These webs have been used in a wide variety of product applications. For example, they have been employed as curtain drape material, bookbinding material, insulation, and backings for carpet. However, while the webs are generally suitable for uses such as have been described, there has been no substantial use of these materials in the filed of disposable fabric products, such as clothing, bed sheets, pillow cases, and the like. While products in these areas have employed nonwoven webs, the nonwovens have been prepared from staple length fibers that are either resin bonded or bonded to tissue. Also, scrim-reinforced materials, i.e., crossed sets of threads bonded at their points of intersection and employed as a reinforcing layer for one or more plies of tissue have been used as disposable nonwovens. The optimum suitability of these nonwovens for disposable fabric uses is generally restricted with respect to either their appearance, their strength characteristics, or their ability to absorb energy under strain.
The use of continuous filament nonwoven webs for disposable fabrics has been limited because of the need for a desirable hand in combination with a pleasing appearance and adequate strength characteristics. In this respect, it has been found that continuous filament webs possessing a desirable hand such that they would be suitable for uses such as bed sheets, hospital gowns and the like, do not possess the necessary uniform and functional opaque appearance required in such applications. On the other hand, while the opaqueness can be increased by using webs with higher basis weights, the webs do not have the required desirable hand, particularly if subsequent softening techniques such as embossing are not employed. In this respect, it should be noted that the webs of the aforementioned Kinney patents as well as others are principally'high basis weight webs possessing an accompanying undesirable hand. Other methods for improving the opacity of low basis weight webs, such as by using lower denier filaments, have processing drawbacks since, for practical purposes. it is difficult toextrude such low denier ,filaments. 7
Moreover, even if a continuous filament web was prepared with an acceptable combination of hand, opacity, and strength, such a web would still be lacking in one very important characteristic. Because such websare comprised predominantly of hydrophobic thermoplastic polymers having an inherently low capacity for absorbing and retaining fluids such as water,
the webs themselves also have such low capacity and retentiveness. This behavior is particularly troublesome where it is desirable to treat the web with an agent such as a flame retardant, a necessity for any type of a disposable product where the user comes into direct contact with the material. Customarily, flame retardants are inexpensively applied with an aqueous carrier. Accordingly, the inability to easily absorb and retain water is a serious drawback necessitating complicated and expensive treating methods to achieve the desired flame retardancy, which methods can adversely affect the physical properties of the fiber. Also, because of this same characteristic, fabrics prepared from the continuous thermoplastic polymer webs do not acquire a high moisture content from the atmosphere, and this detracts from a natural fabric feel as well as presenting potential static problems.
Accordingly, it is an object of the present invention to provide a nonwoven material including a web of continuous thermoplastic filaments which possesses a desirable combination of hand and appearance; A related object is to provide such a material wherein the contin- --uous filament web has a low basis weight.
It is a further object to provide a nonwoven material with the above-described characteristics which also has a good capaicty for absorbing and retaining fluids. A still further object is to provide such a material wherein the strength characteristics are quite isotropic.
It is a still further object to provide a nonwoven material as above described which can be prepared in an eeonomical manner.
Other objects and advantages of the present invention will become apparent by reference to the following description and the accompanying drawings in which:
FIG. l is a schematic illustration of apparatus, and showing one means for forming the nonwoven materials of the present invention.
FIG. 2 is a schematic cross-sectional view of a laminate in various stages of preparation and showing levels of adhesive penetration therein; and
FIG. 3 is a fragmentary plan view of the laminate prepared as illustrated by FIG. I, and with sections of individual layers broken away.
While the present invention is susceptible of various modifications and alternative constructions, there is shown in the drawings and will herein be described in detail the preferred embodiments. It is to be understood, however, that it is not intended to limit the invention to the specific forms disclosed. On the contrary, it is intended to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in the appended claims.
Briefly, the process hereinafter described involves preparing a laminate comprised of a web of continuous thermoplastic polymer filaments and a cellulose wadding web. Lamination is accomplished in a manner such that the desirable attributes of the laminated product are not detrimentally affected.
Turning now to the drawings, FIG. 1 schematically illustrates apparatus which can be used in preparing a three ply laminate of the present invention, wherein the outer plies are cellulosic webs. As shown, a web comprised of a plurality of substantially continuous filaments of a synthetic polymer is unwound from a roll 12 and passed to an adhesive printing station 14. The manner of initial formation of the web 10 is not particularly important, and a variety of well known techniques can be used. In general, such techniques involve continuously extruding a polymer through a spinneret, drawing the spun filaments, and thereafter depositing the drawn filaments on a continuously moving surface in a substantially random fashion. Drawing serves to give the polymer filaments tenacity, while substantially random deposition gives the web desirable isotropic strength characteristics. The aforementioned Kinney patents as well as other patents, such as Levy, US. Pat. No. 3,276,944, illustrate useful techniques of initial web formation.
A particularly useful technique is described in copending application Ser. No. 865,128, titled Continuous Filament Non Woven Web And Process For Producing The Same, and filed on Oct. 9, 1969 and now US. Pat. No. 3,692,618. Use of the method therein disclosed permits high rates of web formation. In general, the disclosed method involves conventional spinning of continuous filaments of synthetic polymer by, for example, extruding the polymer through a multiple number of downwardly directed spinning nozzles preferably extending in a row or multiple number of rows. The filaments as they are spun are gathered into a straight row of side-by-side, evenly spaced apart, untwisted bundles each containing at least 15 and preferably from 50 to 150 filaments. These filament bundles are simultaneously drawn downwardly at a velocity of at least 3,000 meters per minute, and preferably from 3,500 to 8,000 meters per minute, in individually surrounding gas columns flowing at a supersonic velocity and thus directed to impinge on a substantially horizontal carrier.
, The gathering of the filaments into the bundles and their drawing and directing to impinge on the carrier'is preferably effected by passing the bundles through air guns which surround the filaments with a column or jet of air which is directed downward at supersonic velocity. The air guns are arranged so as to extend in a straight row in a direction extending across the carrier at right angles to its direction of movement, so that the bundles contained in the gas columns as they strike the moving carrier extend in a line or row at right angles across the carrier. In order to enhance intermingling of the bundles, the air guns can be made to oscillate, the plane of oscillation being transverse to the direction of carrier movement. The carrier can be a conventional carrier used in the nonwoven art, such as an endless carrier or belt screen or the upper portion of a drum, as for example a screen drum.
When prepared as described above, the filament bundles containing a number of parallel filaments are laid down on the carrier in a loop-like arrangement with primary loops extending back and forth across the width of a section defined by the impingement of the air column from one air gun on the carrier. Before and as the parallel filament bundles impinge the carrier, they are broken up into sub-bundles containing a lesser number of parallel filaments and forming secondary smaller loops and swirls. The secondary loops and swirls overlap each other, and those of adjacent sections, to result in substantially complete intermingling with the overlapping portions of adjacent sections. Thus, the laid-down filament bundles form a continuous uniform nonwoven web.
Referring again to FIG. 1, the thermoplastic polymer used in preparing the continuous filament web 10 must be crystallizable and spinnable and also capable of being bonded as hereinafter discussed. Due to its cost, predominantly isotactic polypropylene is preferred; however, other polymers such as other polyolefins, e. g., linear polyethylene, polyisobutylene, polybutadiene, etc., polyurethanes, polyvinyls, polyamides, and polyesters can also be used. In addition, mixtures of the above polymers and copolymers prepared from monomers used in preparing the above polymers are useful.
For use in the process illustrated in FIG. 1, the web 10 generally can have a basis weight of about 0.3 l oz./yd. with the filaments thereof having a denier of about 0.5 6. Especially preferred laminates can be prepared with webs having basis weights of 0.3 0.7 oz./yd. and filament deniers of about 0.8 2.5.
In order to facilitate web handling, particularly during the subsequently described adhesive application step, it is preferred that the web 10 be bonded. While web bonding can be accomplished by a variety of known techniques, a patterned method of bonding wherein the web is spot bonded at a number of intermittent points throughout the web is preferably employed. As described in copending Brock et al. application, Ser. No. 177,078, filed Sept. 1, 1971 entitled Nonwoven Laminate Containing Bonded Continuous Filament Web, now US. Pat. No. 3,788,936, which is a continuation-in-part of an earlier filed application, Ser. No. 14,943, filed Feb 27, 1970, entitled Nonwoven Laminate Containing Bonded Continuous Filament Web, now abandoned, laminates with a particularly desirable hand are obtained when a pattern bonded continuous filament web is employed. Furthermore, as described in the Brock et al. application, when pattern bonding is accomplished in a manner such that the web is a release bonded" web, laminates with improved properties with respect to energy absorption can be obtained. The manner of preparing a release bonded web is disclosed in copending Hansen et al. application, Ser. 177,077, filed Sept. 1, 1971 entitled Pattern Bonded Continuous Filament Web, now US. Pat. No. 3,855,046, which is a continuation-in-part of an earlier filed and now abandoned application, Ser. No. 121,880, filed Mar. 8, 1971, which is a continuation-inpart application of now abandoned application Ser. No. 15,034, filed Feb. 27, 1970. When the web 10 is pattern bonded with a regular intermittent pattern of bonds, the total bonded area of the web should be about 550% of the web area, and the density of individual bonds should be about 503 200 per square inch. Preferred webs have a total bond area of 820% and a bond density of about -500 per square inch.
Referring again to FIG. 1, at the printing station 14 the continuous filament web 10 is printed on the bottom surface with a discontinuous adhesive pattern. Thus, as is shown, the web passes between an adhesive printing roll 16 and back-up roll 18, the printing roll 16 being partially submerged in the tank 20 containing adhesive 22. The surface of the printing roll 16 is provided with a series of grooves which serve to pick up the adhesive 22 from the tank 20 and transfer the adhesive to the bottom surface of the web 10. A doctor blade can be used to control the amount of adhesive applied.
The grooves on the roll 16 can be in any patterned configuration; however, it is important that the pattern be substantially open and that, after printing, the area.
of the web which is occupied by adhesive be not more than about 25 of the total area, and preferably only about l5% or less of the area. The selection of the appropriate groove pattern on the roll 16 and the effect thereof on the characteristics of the resultant laminate is well known in the art.
While other types of adhesives such as hot melts, latexes, and the thermoplastic'fibers themselves can be employed in the process described herein, it is preferred to employ a'p'lastis'o ladhesive because of the ease of application and the'ability to cure without adversely affecting the desirable laminate characteristics. For example, a plastisol comprised of a polyvinyl chloride resin plasticized' with dioctyl phthalate or any other well known plasticizer can advantageously be used so long as curing can be accomplished at a temperature which does not adversely affect the components of the laminate. At application, the viscosity of i the plastisol is generally about 800-6000 cps. and, preferably l2003200 cps., in order to obtain satisfactory transfer to the web.
Following the adhesive addition, the cellulose wadding webs 24 and 26, generally having basis weights of about 0.3 0.7 oz./yd. and unwound from rolls 28 and 30, are brought into contact with the adhesively printed web at the roll 32 to form the laminate 84. The prime requirements of the cellulose wadding are that it provide the desired opacity for the product laminate and that it have sufficient absorbency to retain any aqueous-borne additives such as flame retardants, printing inks, etc., that might be necessary for a particular application. After formation, the laminate is passed around the heated drum 36 in order to cure the plastisol. The roll 32 and the take off roll 38 serve to maintain contact between the laminate 34 and the heateddrurn 36. If only a two ply laminate is desired,
only the bottom cellulosic web 24 can be employed.
As is apparent from the above discussion, when the web 10 is bonded, adhesive can be directly printed thereon. On the other hand, direct printing is difficult when the web is unbonded. Accordingly, when an unbonded web is used, the adhesive is generally printed directly on the cellulosic webs 24 and 26. Alternatively, if only a two ply laminate is being prepared, the cellulosic web and the unbonded continuous filament web can be reversed in the positions designated in FIG. 1.
In order to obtain a laminate which is both aesthetically pleasing and possesses high delamination resistance, the manner in which the laminate is formed is important. Thus, laminate formation is accomplished such that the adhesive used in bonding sufficiently penetrates the cellulosic layers to assure good laminate strength, and yet adhesive strike-through to the outer surfaces of the cellulose and adhesive spreading within the laminate is minimized. Adhesive strike-through adversely affects laminate appearance, while adhesive spreading gives rise to an undesirable increase in laminate stiffness.
With reference again to FIG. 1, suitable laminate bonding with a plastisol adhesive can be accomplished by appropriately coordinatingthe temperature of the contact with the drum (dwell time), and the pressure exerted on the laminate in the nip formed between the drum and the roll 32. In understanding the manner in .which these parameters are coordinated, reference is and thus, is low. Consequently, on bringing the web into contact with the cellulose wadding webs and subsequently bringing the laminate into contact with the drum, care must be exercised to avoid excessive adhesive penetration and spreading. Nip pressures between the roll 32 and the drum on the order of about -100 pli. are sufficient to achieve a desirable penetration as illustrated-in embodiment (b) of FIG. A
On the other hand, as the laminate' tra velson the drum surface, plastisol temperature and viscosity rise, and the problem of excessive adhesive penetration becomes less significant. Regardingtravelfon the drum surface, the laminate must remainin contact with the surface for a sufficient time to permit the plastisol to cure and develop maximum strength characteristics. For drum temperatures of about 250F. .300F., dwell times of 0.5 3 seconds are usually sufficient. Embodiment (0) of FIG. 2 depicts a cross-section of the finished laminate with the plastisol substantially cured. As can be seen, little additional adhesive penetration occurs during curing on the drum surface.
Referring again to FIG. 1, after leaving the drum 36, the laminate can be passed through the calender stack 40 to provide a smooth surface finish and then wound up on the roll 42. Typically, the calender stack 40 comprises three rolls, 44, 46, and 48, with the top roll 44 generally being at about the same temperature as the drum 36 in order to assure complete plastisol curing. Pressures about equivalent to the nip pressure between the roll 37 and the drum are useful calender pressures.
FIG. 3 illustrates a laminate prepared by thernethod described above. As shown, the laminate has outer plies of cellulosic webs 24 and 26 and a single inner ply of a continuous filament web 10. The individual filaments in the web 10 are bonded together by means of the intermittent pattern of bonds. The layers 24, 10 and 26 are united together by means of the spaced pattern of plastisol adhesive 22.
As should be apparent from the above discussion, the apparatus and process illustrated by FIG. 1 can readily be used to prepare a laminate wherein the outer plies are the continuous filament webs and the inner ply is a cellulosic web. Such laminates are disclosed in co- 0 tinuation-in-part application, Ser. No. 247,962, filed Apr. 27, 1972, now U.S. Pat. No. 3,870,592. In addition to possessing the desirable attributes discussed above with respect to the laminates illustrated in FIG.
3, the laminates disclosed in the Brock and Hudson apheated drum, the time during which the laminate is in plication additionally possess exceptionally surprising textile-like features, are wrinkle resistant, and can be washed several times.
The following example illustrates the invention. All parts and percentages are by weight unless otherwise indicated. As reported in the example, Tensile Strength Elongation (7:
(Ts) and Elongation (E) are measured on l X 3 inch samples using a cross-head speed of 12 in/min. according to ASTM D l 1 17-63. Wrinkle Recovery (WR) and Opacity (Op) are measured using the following standard procedures:
(WR) A TC 66 1959T (Op) TAPPIT 425M 6O EXAMPLE I A laminate having outer plies of creped cellulose wadding (each being 12 wide and having a basis weight of 13 g/yd?) and an inner ply of an intermittently bonded continuous filament polypropylene web (12" wide with basis weight of 15 g/yd. bonded according to Example of Hansen et al.) was prepared in a manner described above with reference to FIG. 1. The conditions of preparation were as follows: Web Speed 50 ft./min. Roll 32 6.5 inch dia., 200 pli. pressure against drum 36; Drum 36 30 inch dia., 285F.; 11011544, 46, and 48 inch dia., roll 44 at 225F., calender pressure at 200 pli. Laminate wrap on drum surface 4.25 feet. The adhesive applied at the printing station 14 was a plastisol consisting of: 100 parts polyvinyl chloride copolymer (Geon 130 X 10), 100 parts dioctyl phthalate plasticizer (BFG 264) and 10 parts low odor mineral spirits (No. 17 The plastisol was applied to the web in an amount of 5 grams/yd. and at a Brookfield viscosity of 1400 cps. (No. 4 spindle, 20 rpm.s C). After printing, the plastisol occupied 10% of the web area and was disposed thereon in a rectangular block (0.02 X 0.20) pattern with 43,200 blocks/yd? TABLE 1 Test M.D C.D
Tensile Strength (lbs) 5.9 4.9
Wrinkle Recovery Opacity (7( light ab.)
As can be seen the laminate prepared above possesses desirable isotropic strength characteristics and a desirable opaque appearance. In addition, it has a desirable hand and good capacity for absorbing and retaining fluids. Accordingly, the laminate fully satisfies the aims, objectives and advantages set forth above. Reference is also directed to copending Beaudoin, et a1. application, Ser. No. 126,530, filed on Feb. 22, 1972 which application has been abandoned in favor of continuation-in-part application Ser. No. 228,349, filed Feb. 22, 1972, and now US Pat. No. 3,793,133. Therein, it is disclosed that a laminate comprised of an intermittently bonded continuous filament web and a web of cellulose wadding can be fashioned with especially desirable energy absorbing and strength characteristics by appropriately controlling the intensity of the intermittent bonds and the ply attaching adhesive.
I claim as my invention: 1. A nonwoven fabric-like laminate comprising, in
combination, 1 a. a low basis weight, single ply nonwoven web of substantially continuous and randomly deposited, molecula rly oriented filaments of a hydrophobic thermoplastic polymer, said web prepared by continuous polymer extrusion through a spinneret and filament deposition on a supporting surface and having a basis weight of up to about 0.7 oz./yd. with the filaments thereof having a denier of about 0.5-about 6,
b. a web of cellulose wadding having a basis weight of about 0.3-about 0.7 oz./yd. disposed in laminar relationship with respect to the single ply web (a), and
c. patterned areas of adhesive disposed between said webs which penetrate into said cellulose wadding web at spaced open areas in a manner so as to provide delamination resistance in combination with fabric-like flexibility, said nonwoven web and cellulose wadding web combining to provide a material with desirable isotropic strength characteristics, fabric-like opaqueness, absorbency, and a natural fabric feel.
2. The nonwoven fabric-like laminate of claim 1 wherein the nonwoven web has a basis weight of about 0.3-about 0.7 oz./yd. the thermoplastic polymer is polypropylene, and the filaments have a denier of about 0.8-about 2.5.
3. The nonwoven fabric-like laminate of claim 1 comprising outer plies of cellulose wadding and, as an inner ply, the single ply nonwoven web.
4. The nonwoven fabric-like laminate of claim 3 wherein the continuous filament web is bonded by the application of heat and pressure at intermittent areas occupying about 5-50% of the web area and in a density of about 50-3200 per square inch. 7
5. The nonwoven fabric-like laminate of claim 4 wherein the thermoplastic polymer is polypropylene.
6. The nonwoven fabric-like laminate of claim 3 wherein the nonwoven web has a basis weight of about O.3-about 0.7 oz./yd. the thermoplastic polymer is polypropylene, and the filaments have a denier of about O.8about 2.5.
7. A nonwoven fabric-like laminate comprising, in combination,
a. a low basis weight, single ply nonwoven web of substantially continuous and randomly deposited, molecularly oriented filaments of a hydrophobic'thermoplastic polymer selected from polyolefins, polyurethanes, polyvinyls, polyamides and polyesters, said web prepared by continuous polymer extrusion through a spinneret and filament deposition on a supporting surface and having a basis weight of up to 0.7 oz./yd. with the filaments thereof having a denier of about 0.5-about 6,
b. a web of cellulose wadding having a basis weight of about 0.3-about 0.7 oz./yd. disposed in laminar relationship with respect to the single ply web (a), and
c. patterned areas of a plastisol adhesive disposed between said webs which penetrate into said cellulose wadding web at spaced open areas occupying less than about 25% surface area in a manner so as to provide delamination resistance in combination with fabric-like flexibility, said nonwoven web and cellulose wadding web combining to provide a material with desirable isotropic strength characteristics, fabric-like opaqueness, absorbency, and a natural fabric feel.
8. The nonwoven fabric-like laminate of claim 7 wherein the continuous filament web is bonded by the.
application of heat and pressure at intermittent areas occupying about 5-50% of the web area and in a density of about 50-3200 per square inch.
comprising outer plies of cellulose wadding and, as an inner ply, the single ply nonwoven web.
11. The nonwoven fabric-like laminate of claim 10 wherein the spaced open areas of plastisol adhesive occupy less than about 15% surface area.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2410884 *||26 Jan 1943||12 Nov 1946||Utility Fabrics Company Inc||Composite fabric|
|US2638146 *||7 Jan 1949||12 May 1953||Glas Kraft Inc||Reinforced paper and method and apparatus for the manufacture thereof|
|US2693844 *||30 Dec 1950||9 Nov 1954||Owens Corning Fiberglass Corp||Apparatus for reinforcing sheet material|
|US2902395 *||30 Sep 1954||1 Sep 1959||Kimberly Clark Co||Absorbent wiping sheet|
|US3025199 *||31 Jul 1959||13 Mar 1962||Kimberly Clark Co||Puffed cellulosic product and method of manufacture|
|US3063454 *||26 Feb 1959||13 Nov 1962||Cleanese Corp Of America||Non-woven products|
|US3276944 *||30 Aug 1963||4 Oct 1966||Du Pont||Non-woven sheet of synthetic organic polymeric filaments and method of preparing same|
|US3327708 *||21 Jun 1965||27 Jun 1967||Kimberly Clark Co||Laminated non-woven fabric|
|US3341394 *||21 Dec 1966||12 Sep 1967||Du Pont||Sheets of randomly distributed continuous filaments|
|US3368934 *||13 May 1964||13 Feb 1968||Du Pont||Nonwoven fabric of crimped continuous polyethylene terephthalate fibers|
|US3424643 *||8 Nov 1965||28 Jan 1969||Kimberly Clark Co||Sheet material creped tissue product|
|US3509009 *||6 Feb 1967||28 Apr 1970||Freudenberg Carl Kg||Non-woven fabric|
|US3708383 *||4 Jun 1971||2 Jan 1973||Kimberly Clark Co||Non-woven roll towel material|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3973066 *||16 Jan 1975||3 Aug 1976||The Fiberwoven Corporation||Electric blanket shell and method of production|
|US4507351 *||11 Jan 1983||26 Mar 1985||The Proctor & Gamble Company||Strong laminate|
|US4588457 *||2 Aug 1985||13 May 1986||The Procter & Gamble Company||Two-ply nonwoven fabric laminate|
|US4610915 *||11 Mar 1983||9 Sep 1986||The Procter & Gamble Company||Two-ply nonwoven fabric laminate|
|US5629077 *||27 Jun 1994||13 May 1997||Advanced Cardiovascular Systems, Inc.||Biodegradable mesh and film stent|
|US5766710 *||19 Jun 1996||16 Jun 1998||Advanced Cardiovascular Systems, Inc.||Biodegradable mesh and film stent|
|US5910224 *||11 Sep 1997||8 Jun 1999||Kimberly-Clark Worldwide, Inc.||Method for forming an elastic necked-bonded material|
|US5981037 *||30 Jan 1998||9 Nov 1999||Owens Corning Fiberglas Technology, Inc.||Patterned bonding of encapsulation material to an insulation assembly|
|US6527801||13 Apr 2000||4 Mar 2003||Advanced Cardiovascular Systems, Inc.||Biodegradable drug delivery material for stent|
|US6537644 *||13 Dec 1999||25 Mar 2003||First Quality Nonwovens, Inc.||Nonwoven with non-symmetrical bonding configuration|
|US6872274 *||5 Oct 2001||29 Mar 2005||First Quality Nonwovens, Inc.||Method of making nonwoven with non-symmetrical bonding configuration|
|US7077860||24 Jun 2004||18 Jul 2006||Advanced Cardiovascular Systems, Inc.||Method of reducing or eliminating thrombus formation|
|US7186789||11 Jun 2003||6 Mar 2007||Advanced Cardiovascular Systems, Inc.||Bioabsorbable, biobeneficial polyester polymers for use in drug eluting stent coatings|
|US7198675||30 Sep 2003||3 Apr 2007||Advanced Cardiovascular Systems||Stent mandrel fixture and method for selectively coating surfaces of a stent|
|US7229471||10 Sep 2004||12 Jun 2007||Advanced Cardiovascular Systems, Inc.||Compositions containing fast-leaching plasticizers for improved performance of medical devices|
|US7258891||7 Apr 2003||21 Aug 2007||Advanced Cardiovascular Systems, Inc.||Stent mounting assembly and a method of using the same to coat a stent|
|US7285304||25 Jun 2003||23 Oct 2007||Advanced Cardiovascular Systems, Inc.||Fluid treatment of a polymeric coating on an implantable medical device|
|US7291166||18 May 2005||6 Nov 2007||Advanced Cardiovascular Systems, Inc.||Polymeric stent patterns|
|US7297159||21 Jul 2004||20 Nov 2007||Advanced Cardiovascular Systems, Inc.||Selective coating of medical devices|
|US7297758||2 Aug 2005||20 Nov 2007||Advanced Cardiovascular Systems, Inc.||Method for extending shelf-life of constructs of semi-crystallizable polymers|
|US7301001||20 Dec 2006||27 Nov 2007||Advanced Cardiovascular Systems, Inc.||Bioabsorbable, biobeneficial polyester polymers for stent coatings|
|US7312299||20 Dec 2006||25 Dec 2007||Advanced Cardiovascular Systems, Inc.||Bioabsorbabl, biobeneficial polyester polymers for stent coatings|
|US7329366||18 Jun 2004||12 Feb 2008||Advanced Cardiovascular Systems Inc.||Method of polishing implantable medical devices to lower thrombogenecity and increase mechanical stability|
|US7381048||12 Apr 2005||3 Jun 2008||Advanced Cardiovascular Systems, Inc.||Stents with profiles for gripping a balloon catheter and molds for fabricating stents|
|US7390333||10 Jan 2003||24 Jun 2008||Advanced Cardiovascular Systems, Inc.||Biodegradable drug delivery material for stent|
|US7470283||10 Jan 2003||30 Dec 2008||Advanced Cardiovascular Systems, Inc.||Biodegradable drug delivery material for stent|
|US7476245||16 Aug 2005||13 Jan 2009||Advanced Cardiovascular Systems, Inc.||Polymeric stent patterns|
|US7553377||27 Apr 2004||30 Jun 2009||Advanced Cardiovascular Systems, Inc.||Apparatus and method for electrostatic coating of an abluminal stent surface|
|US7563324||29 Dec 2003||21 Jul 2009||Advanced Cardiovascular Systems Inc.||System and method for coating an implantable medical device|
|US7604700||16 Jan 2007||20 Oct 2009||Advanced Cardiovascular Systems, Inc.||Stent mandrel fixture and method for selectively coating surfaces of a stent|
|US7622070||20 Jun 2005||24 Nov 2009||Advanced Cardiovascular Systems, Inc.||Method of manufacturing an implantable polymeric medical device|
|US7632307||16 Dec 2004||15 Dec 2009||Advanced Cardiovascular Systems, Inc.||Abluminal, multilayer coating constructs for drug-delivery stents|
|US7658880||29 Jul 2005||9 Feb 2010||Advanced Cardiovascular Systems, Inc.||Polymeric stent polishing method and apparatus|
|US7662326||27 Apr 2007||16 Feb 2010||Advanced Cardiovascular Systems, Inc.||Compositions containing fast-leaching plasticizers for improved performance of medical devices|
|US7699890||28 Jan 2004||20 Apr 2010||Advanced Cardiovascular Systems, Inc.||Medicated porous metal prosthesis and a method of making the same|
|US7708548||10 Apr 2008||4 May 2010||Advanced Cardiovascular Systems, Inc.||Molds for fabricating stents with profiles for gripping a balloon catheter|
|US7731890||15 Jun 2006||8 Jun 2010||Advanced Cardiovascular Systems, Inc.||Methods of fabricating stents with enhanced fracture toughness|
|US7740791||30 Jun 2006||22 Jun 2010||Advanced Cardiovascular Systems, Inc.||Method of fabricating a stent with features by blow molding|
|US7757543||13 Jul 2006||20 Jul 2010||Advanced Cardiovascular Systems, Inc.||Radio frequency identification monitoring of stents|
|US7758881||24 Mar 2005||20 Jul 2010||Advanced Cardiovascular Systems, Inc.||Anti-proliferative and anti-inflammatory agent combination for treatment of vascular disorders with an implantable medical device|
|US7761968||25 May 2006||27 Jul 2010||Advanced Cardiovascular Systems, Inc.||Method of crimping a polymeric stent|
|US7794495||17 Jul 2006||14 Sep 2010||Advanced Cardiovascular Systems, Inc.||Controlled degradation of stents|
|US7794776||29 Jun 2006||14 Sep 2010||Abbott Cardiovascular Systems Inc.||Modification of polymer stents with radiation|
|US7823263||9 Jul 2007||2 Nov 2010||Abbott Cardiovascular Systems Inc.||Method of removing stent islands from a stent|
|US7829008||30 May 2007||9 Nov 2010||Abbott Cardiovascular Systems Inc.||Fabricating a stent from a blow molded tube|
|US7842737||29 Sep 2006||30 Nov 2010||Abbott Cardiovascular Systems Inc.||Polymer blend-bioceramic composite implantable medical devices|
|US7867547||19 Dec 2005||11 Jan 2011||Advanced Cardiovascular Systems, Inc.||Selectively coating luminal surfaces of stents|
|US7875233||18 Jul 2005||25 Jan 2011||Advanced Cardiovascular Systems, Inc.||Method of fabricating a biaxially oriented implantable medical device|
|US7875283||16 Jun 2005||25 Jan 2011||Advanced Cardiovascular Systems, Inc.||Biodegradable polymers for use with implantable medical devices|
|US7886419||18 Jul 2006||15 Feb 2011||Advanced Cardiovascular Systems, Inc.||Stent crimping apparatus and method|
|US7901452||27 Jun 2007||8 Mar 2011||Abbott Cardiovascular Systems Inc.||Method to fabricate a stent having selected morphology to reduce restenosis|
|US7923022||13 Sep 2006||12 Apr 2011||Advanced Cardiovascular Systems, Inc.||Degradable polymeric implantable medical devices with continuous phase and discrete phase|
|US7951185||6 Jan 2006||31 May 2011||Advanced Cardiovascular Systems, Inc.||Delivery of a stent at an elevated temperature|
|US7951194||22 May 2007||31 May 2011||Abbott Cardiovascular Sysetms Inc.||Bioabsorbable stent with radiopaque coating|
|US7955381||29 Jun 2007||7 Jun 2011||Advanced Cardiovascular Systems, Inc.||Polymer-bioceramic composite implantable medical device with different types of bioceramic particles|
|US7959857||1 Jun 2007||14 Jun 2011||Abbott Cardiovascular Systems Inc.||Radiation sterilization of medical devices|
|US7959940||30 May 2006||14 Jun 2011||Advanced Cardiovascular Systems, Inc.||Polymer-bioceramic composite implantable medical devices|
|US7964210||31 Mar 2006||21 Jun 2011||Abbott Cardiovascular Systems Inc.||Degradable polymeric implantable medical devices with a continuous phase and discrete phase|
|US7967998||3 Jan 2008||28 Jun 2011||Advanced Cardiocasvular Systems, Inc.||Method of polishing implantable medical devices to lower thrombogenecity and increase mechanical stability|
|US7971333||30 May 2006||5 Jul 2011||Advanced Cardiovascular Systems, Inc.||Manufacturing process for polymetric stents|
|US7989018||31 Mar 2006||2 Aug 2011||Advanced Cardiovascular Systems, Inc.||Fluid treatment of a polymeric coating on an implantable medical device|
|US7998404||13 Jul 2006||16 Aug 2011||Advanced Cardiovascular Systems, Inc.||Reduced temperature sterilization of stents|
|US8003156||4 May 2006||23 Aug 2011||Advanced Cardiovascular Systems, Inc.||Rotatable support elements for stents|
|US8007529||1 Aug 2008||30 Aug 2011||Advanced Cardiovascular Systems, Inc.||Medicated porous metal prosthesis|
|US8016879||27 Jun 2007||13 Sep 2011||Abbott Cardiovascular Systems Inc.||Drug delivery after biodegradation of the stent scaffolding|
|US8017237||23 Jun 2006||13 Sep 2011||Abbott Cardiovascular Systems, Inc.||Nanoshells on polymers|
|US8034287||15 May 2007||11 Oct 2011||Abbott Cardiovascular Systems Inc.||Radiation sterilization of medical devices|
|US8043553||30 Sep 2004||25 Oct 2011||Advanced Cardiovascular Systems, Inc.||Controlled deformation of a polymer tube with a restraining surface in fabricating a medical article|
|US8048441||25 Jun 2007||1 Nov 2011||Abbott Cardiovascular Systems, Inc.||Nanobead releasing medical devices|
|US8048448||15 Jun 2006||1 Nov 2011||Abbott Cardiovascular Systems Inc.||Nanoshells for drug delivery|
|US8099849||13 Dec 2006||24 Jan 2012||Abbott Cardiovascular Systems Inc.||Optimizing fracture toughness of polymeric stent|
|US8109994||2 Jan 2008||7 Feb 2012||Abbott Cardiovascular Systems, Inc.||Biodegradable drug delivery material for stent|
|US8128688||19 Jun 2007||6 Mar 2012||Abbott Cardiovascular Systems Inc.||Carbon coating on an implantable device|
|US8172897||28 Jun 2004||8 May 2012||Advanced Cardiovascular Systems, Inc.||Polymer and metal composite implantable medical devices|
|US8173062||30 Sep 2004||8 May 2012||Advanced Cardiovascular Systems, Inc.||Controlled deformation of a polymer tube in fabricating a medical article|
|US8197879||16 Jan 2007||12 Jun 2012||Advanced Cardiovascular Systems, Inc.||Method for selectively coating surfaces of a stent|
|US8202528||5 Jun 2007||19 Jun 2012||Abbott Cardiovascular Systems Inc.||Implantable medical devices with elastomeric block copolymer coatings|
|US8241554||29 Jun 2004||14 Aug 2012||Advanced Cardiovascular Systems, Inc.||Method of forming a stent pattern on a tube|
|US8262723||9 Apr 2007||11 Sep 2012||Abbott Cardiovascular Systems Inc.||Implantable medical devices fabricated from polymer blends with star-block copolymers|
|US8293260||5 Jun 2007||23 Oct 2012||Abbott Cardiovascular Systems Inc.||Elastomeric copolymer coatings containing poly (tetramethyl carbonate) for implantable medical devices|
|US8293367||15 Jul 2011||23 Oct 2012||Advanced Cardiovascular Systems, Inc.||Nanoshells on polymers|
|US8333000||19 Jun 2006||18 Dec 2012||Advanced Cardiovascular Systems, Inc.||Methods for improving stent retention on a balloon catheter|
|US8343530||22 Dec 2006||1 Jan 2013||Abbott Cardiovascular Systems Inc.||Polymer-and polymer blend-bioceramic composite implantable medical devices|
|US8414642||1 Dec 2008||9 Apr 2013||Advanced Cardiovascular Systems, Inc.||Biodegradable stent of a polyorthoester polymer or a polyanhydride polymer|
|US8425591||11 Jun 2007||23 Apr 2013||Abbott Cardiovascular Systems Inc.||Methods of forming polymer-bioceramic composite medical devices with bioceramic particles|
|US8435550||13 Aug 2008||7 May 2013||Abbot Cardiovascular Systems Inc.||Anti-proliferative and anti-inflammatory agent combination for treatment of vascular disorders with an implantable medical device|
|US8465789||18 Jul 2011||18 Jun 2013||Advanced Cardiovascular Systems, Inc.||Rotatable support elements for stents|
|US8470014||14 Aug 2007||25 Jun 2013||Advanced Cardiovascular Systems, Inc.||Stent-catheter assembly with a releasable connection for stent retention|
|US8486135||9 Apr 2007||16 Jul 2013||Abbott Cardiovascular Systems Inc.||Implantable medical devices fabricated from branched polymers|
|US8535372||18 Jun 2007||17 Sep 2013||Abbott Cardiovascular Systems Inc.||Bioabsorbable stent with prohealing layer|
|US8568469||28 Jun 2004||29 Oct 2013||Advanced Cardiovascular Systems, Inc.||Stent locking element and a method of securing a stent on a delivery system|
|US8585754||13 Jan 2012||19 Nov 2013||Abbott Cardiovascular Systems Inc.||Stent formed of a Biodegradable material|
|US8592036||20 Sep 2012||26 Nov 2013||Abbott Cardiovascular Systems Inc.||Nanoshells on polymers|
|US8596215||18 Jul 2011||3 Dec 2013||Advanced Cardiovascular Systems, Inc.||Rotatable support elements for stents|
|US8603530||14 Jun 2006||10 Dec 2013||Abbott Cardiovascular Systems Inc.||Nanoshell therapy|
|US8637110||18 Jul 2011||28 Jan 2014||Advanced Cardiovascular Systems, Inc.||Rotatable support elements for stents|
|US8739727||8 Oct 2012||3 Jun 2014||Boston Scientific Scimed, Inc.||Coated medical device and method for manufacturing the same|
|US8741379||18 Jul 2011||3 Jun 2014||Advanced Cardiovascular Systems, Inc.||Rotatable support elements for stents|
|US8747878||28 Apr 2006||10 Jun 2014||Advanced Cardiovascular Systems, Inc.||Method of fabricating an implantable medical device by controlling crystalline structure|
|US8747879||31 May 2006||10 Jun 2014||Advanced Cardiovascular Systems, Inc.||Method of fabricating an implantable medical device to reduce chance of late inflammatory response|
|US8752267||9 Aug 2013||17 Jun 2014||Abbott Cardiovascular Systems Inc.||Method of making stents with radiopaque markers|
|US8752268||9 Aug 2013||17 Jun 2014||Abbott Cardiovascular Systems Inc.||Method of making stents with radiopaque markers|
|US8778256||30 Sep 2004||15 Jul 2014||Advanced Cardiovascular Systems, Inc.||Deformation of a polymer tube in the fabrication of a medical article|
|US8808342||23 Apr 2013||19 Aug 2014||Abbott Cardiovascular Systems Inc.||Nanoshell therapy|
|US8846070||29 Jul 2008||30 Sep 2014||Advanced Cardiovascular Systems, Inc.||Biologically degradable compositions for medical applications|
|US8925177||17 Jul 2012||6 Jan 2015||Abbott Cardiovascular Systems Inc.||Methods for improving stent retention on a balloon catheter|
|US9038260||8 May 2014||26 May 2015||Abbott Cardiovascular Systems Inc.||Stent with radiopaque markers|
|US9072820||26 Jun 2006||7 Jul 2015||Advanced Cardiovascular Systems, Inc.||Polymer composite stent with polymer particles|
|US9173733||21 Aug 2006||3 Nov 2015||Abbott Cardiovascular Systems Inc.||Tracheobronchial implantable medical device and methods of use|
|US9198785||4 Dec 2013||1 Dec 2015||Abbott Cardiovascular Systems Inc.||Crush recoverable polymer scaffolds|
|US9248034||23 Aug 2005||2 Feb 2016||Advanced Cardiovascular Systems, Inc.||Controlled disintegrating implantable medical devices|
|US9259341||27 Feb 2013||16 Feb 2016||Abbott Cardiovascular Systems Inc.||Methods for improving stent retention on a balloon catheter|
|US9283099||25 Aug 2004||15 Mar 2016||Advanced Cardiovascular Systems, Inc.||Stent-catheter assembly with a releasable connection for stent retention|
|US9295570||23 Feb 2005||29 Mar 2016||Abbott Laboratories Vascular Enterprises Limited||Cold-molding process for loading a stent onto a stent delivery system|
|US9358325||22 Apr 2015||7 Jun 2016||Abbott Cardiovascular Systems Inc.||Stents with radiopaque markers|
|US9532888||31 Dec 2014||3 Jan 2017||Abbott Cardiovascular Systems Inc.||Stents with radiopaque markers|
|US9579225||24 Nov 2014||28 Feb 2017||Abbott Cardiovascular Systems Inc.||Methods for improving stent retention on a balloon catheter|
|US9694116||10 May 2016||4 Jul 2017||Abbott Cardiovascular Systems Inc.||Stents with radiopaque markers|
|US20030097173 *||10 Jan 2003||22 May 2003||Debashis Dutta||Biodegradable drug delivery material for stent|
|US20030105518 *||10 Jan 2003||5 Jun 2003||Debashis Dutta||Biodegradable drug delivery material for stent|
|US20040253203 *||11 Jun 2003||16 Dec 2004||Hossainy Syed F.A.||Bioabsorbable, biobeneficial polyester polymers for use in drug eluting stent coatings|
|US20050232971 *||16 Jun 2005||20 Oct 2005||Hossainy Syed F||Biodegradable polymers for use with implantable medical devices|
|US20060271170 *||31 May 2005||30 Nov 2006||Gale David C||Stent with flexible sections in high strain regions|
|US20060292690 *||21 Jun 2006||28 Dec 2006||Cesco Bioengineering Co., Ltd.||Method of making cell growth surface|
|US20070123689 *||20 Dec 2006||31 May 2007||Advanced Cardiovascular Systems, Inc.||Bioabsorbable, biobeneficial polyester polymers for stent coatings|
|US20080103583 *||2 Jan 2008||1 May 2008||Debashis Dutta||Biodegradable drug delivery material for stent|
|EP0689807A3 *||27 Jun 1995||7 Aug 1996||Advanced Cardiovascular System||Biodegradable mesh-and-film stent|
|U.S. Classification||428/196, 428/198, 428/219, 442/389|
|International Classification||D04H5/04, D04H5/00|