Patent US3816170A successfully refreshed from Google Patents.
US3816170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor permeable compositions
Assignee: Unilever Bestfoods North America
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Filing: 1972-04-14
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Granted: 1974-06-11
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Expires: 1992-04-14
Abstract
Abstract WHEREIN R1 is selected from the group consisting of hydrogen and alkyl of up to four carbon atoms, R2 and R3 are alkyl of up to four carbon atoms; and (b) a hydrophobic polymeric material comprising from about 90 to about 40 parts by weight of a polymer selected from the group consisting of a polymer of vinyl chloride, polyurethane, poly(methyl methacrylate), polyamide, polypropylene and polyester. This invention discloses a water vapor permeable filmforming composition comprising: (a) a hydrophilic thermoplastic polymeric material comprising from about 10 to about 60 parts by weight of a homopolymer, copolymer or graft copolymer of an unsaturated amide of the formula:
Inventors
- 👤 J Mudde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C09; C09D; C09D133/00; C09D133/24; C09D133/26; C08L33/00; C08L33/24; C08L33/26; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
The process of claim 1, wherein said polymer of N,N-dimethylacrylamide is a homopolymer.
Claim 2
Dependent Claim
51 words
The process of claim 1, wherein said polymer of N,N-dimethylacrylamide is comprised of a copolymer or graft copolymer of N,N-dimethylacrylamide, wherein, said comonomers used for forming said copolymer or graft copolymer are comprised of a polymerizable monomer whose polymer has a glass transition temperature below that of a homopolymer of N,N-dimethylacrylamide.
Claim 3
Dependent Claim
24 words
The process of claim 3, wherein said comonomers are members selected from the group consisting of butyl acrylate, 2-ethylhexyl acrylate, acrylonitrile and vinyl acetate.
Claim 4
Dependent Claim
41 words
The process of claim 1, wherein the plasticizer for said polymer of vinyl chloride is present in amounts ranging from about 5 to about 100 parts by weight per 100 parts by weight of combined normally hydrophilic and hydrophobic polymeric materials.
Claim 5
Dependent Claim
12 words
The process of claim 1, wherein said organic liquid is an alcohol.
Claim 6
Dependent Claim
10 words
The process of claim 6, wherein said alcohol is n-butanol.
Claim 7
Dependent Claim
46 words
The process of claim 1, wherein said mixture is prepared by first dissolving said normally hydrophilic polymeric material in said organic liquid and in a subsequent step adding to the solution of the normally hydrophilic polymeric material and organic liquid said plasticized polymer of vinyl chloride.
Claim 8
Dependent Claim
17 words
The process of claim 1, wherein the film is cured subsequent to removal of the organic liquid.
Claim 9
Dependent Claim
13 words
A coated article comprising a substrate coated by the method of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |