Patent US5404882A successfully refreshed from Google Patents.
US4374232A
Expired / Lapsed
US
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Graft copolymer membrane and processes of manufacturing and using the same
Assignee: Pall Corp
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Filing: 1981-05-13
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Granted: 1983-02-15
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Expires: 2001-05-13
Abstract
Abstract A cast film, sheet or coating of a crosslinked graft copolymer of an organic polymeric substrate and an ethylenically unsaturated organic monomer is formed by effecting the graft copolymerization while the polymeric substrate and monomer are in solution in a solvent thereby to form the crosslinked graft copolymer in the form of a gel, subjecting the gel to high shear forces to convert it to a thixotropic suspension, forming the thixotropic suspension into a layer, and removing the solvent from the layer.
Inventors
- 👤 William J. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:27
CPC Classifications
C; C08; C08F; C08F291/00; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/429; H01M50/449; H01M50/454; H01M50/489; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
139 words
A process for preparing a graft copolymer film, sheet or coating, which comprises forming a reaction mixture comprising an organic polymeric substrate and an ethylenically unsaturated monomer dissolved in an organic solvent, initiating graft copolymerization of said polymeric substrate and said monomer by forming free radicals on said polymeric substrate in said reaction mixture and copolymerizing and crosslinking said polymeric substrate and said monomer while dissolved in said solvent to form a crosslinked graft copolymer of said polymeric substrate and said monomer in the form of a gel, subjecting said graft copolymer in said solvent to high shear forces to convert it from a gel to a thixotropic suspension containing said graft copolymer, forming said thixotropic suspension into a layer thereof on a support, and removing the solvent from said layer thereby to form the film, sheet or coating.
Claim 2
Dependent Claim
139 words
A process for preparing a graft copolymer film, sheet or coating, which comprises forming a reaction mixture comprising an organic polymeric substrate and an ethylenically unsaturated monomer dissolved in an organic solvent, initiating graft copolymerization of said polymeric substrate and said monomer by forming free radicals on said polymeric substrate in said reaction mixture and copolymerizing and crosslinking said polymeric substrate and said monomer while dissolved in said solvent to form a crosslinked graft copolymer of said polymeric substrate and said monomer in the form of a gel, subjecting said graft copolymer in said solvent to high shear forces to convert it from a gel to a thixotropic suspension containing said graft copolymer, forming said thixotropic suspension into a layer thereof on a support, and removing the solvent from said layer thereby to form the film, sheet or coating.
Claim 3
Dependent Claim
38 words
The process according to claim 1, wherein prior to forming the thixotropic suspension into the layer thereof on the support, a portion of the solvent is removed from said thixotropic suspension to produce a more concentrated thixotropic suspension.
Claim 4
Dependent Claim
46 words
The process according to claim 2, wherein said portion of the solvent is removed by allowing the thixotropic suspension to regel and decanting solvent from said regelled product, said regelled product then being subjected to the high shear forces to form said more concentrated thixotropic suspension.
Claim 5
Dependent Claim
17 words
The process according to claim 1, wherein said film sheet or coating is removed from said support.
Claim 6
Dependent Claim
17 words
The process according to claim 1, wherein said film sheet or coating is adhered to said support.
Claim 7
Dependent Claim
24 words
The process according to claim 5, wherein said support is selected from the group consisting of non-woven material, microporous cellophane film or cellulose film.
Claim 8
Dependent Claim
36 words
The process according to claim 1, wherein said polymeric substrate is selected from the group consisting of homopolymers and copolymers of olefins, polyesters, polyvinylchloride, polyvinylidene chloride, polyvinylalcohol, polystyrene, polyvinylketones, polyamides, polyurethanes, polyvinylethers, polyacrylonitrile, polybutadiene and isoprene.
Claim 9
Dependent Claim
21 words
The process according to claim 1, wherein said polymeric substrate is selected from the group consisting of polyolefins, polyamides and poly(vinylhalides).
Claim 10
Dependent Claim
31 words
The process according to claim 1, wherein said polymeric substrate is selected from the group consisting of polyolefins having a molecular weight of from about 10,000 to 2 or 3 million.
Claim 11
Dependent Claim
38 words
The process according to claim 1, wherein said ethylenically unsaturated monomer is selected from the group consisting of ethylenically unsaturated organic acids, alcohols, ethers, ketones, esters, aldehydes, isocyanates, sulfonates, mercaptans, thioethers, disulfides, nitriles, nitrocompounds, amines, amides and halides.
Claim 12
Dependent Claim
17 words
The process according to claim 1, wherein said ethylenically unsaturated monomer is an ethylenically unsaturated carboxylic acid.
Claim 13
Dependent Claim
22 words
The process according to claim 1, wherein the ratio of said polymeric substrate to monomer is from about 50:1 to about 1:10.
Claim 14
Dependent Claim
24 words
The process according to claim 1, wherein said free radicals are formed on said polymeric substrate by irradiating said reaction mixture with ionizing radiation.
Claim 15
Dependent Claim
25 words
The process according to claim 1, wherein a free radical catalyst is dissolved in said reaction mixture to form free radicals on said polymeric substrate.
Claim 16
Dependent Claim
15 words
The process according to claim 14, wherein said free radical catalyst is a peroxide catalyst.
Claim 17
Dependent Claim
15 words
The process according to claim 14, wherein said free radical catalyst is an azo catalyst.
Claim 18
Dependent Claim
27 words
The process according to claim 15, wherein said peroxide catalyst is selected from the group consisting of alkyl, acyl and ketone peroxides, hydroperoxides, peresters and peroxy carbonates.
Claim 19
Dependent Claim
32 words
The process according to claim 14, wherein said free radical catalyst is present in an amount of from about 0.1 to about 10% by weight of said polymeric substrate and said monomer.
Claim 20
Dependent Claim
23 words
The process according to claim 14, wherein said reaction mixture is heated to a temperature of from about 60° to about 170° C.
Claim 21
Dependent Claim
28 words
The process according to claim 1, wherein said gels are subjected to said high shear forces while at a temperature of from about 30° to about 100° C.
Claim 22
Dependent Claim
43 words
The process according to claim 1 wherein said polymeric substrate is selected from the group consisting of the polyolefins, the polyamides and the polyvinylhalides and wherein said ethylenically unsaturated monomer is an ethylenically unsaturated carboxylic acid or a salt, anhydride or ester thereof.
References Cited (Backward Citations)
US3644584A
Cited
US3936411A
Cited
US3935136A
Cited
US4279795A
Cited
US4122133A
Cited
US4201641A
Cited
US4281083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |