Patent US4167464A successfully refreshed from Google Patents.
US4167464A
Expired / Lapsed
US
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Photopolymerized hydrophilic interpolymers of unsaturated carboxylic acid and esters
Assignee: Goodrich Corp
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Filing: 1978-10-16
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Granted: 1979-09-11
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Expires: 1998-10-16
Abstract
Abstract Highly water absorbent films and fibers are prepared by photopolymerizing an alkaline metal salt of acrylic acid, at least one alkyl acrylate or methacrylate wherein the alkyl group contains 10 to 30 carbon atoms, at least one alkyl acrylate or methacrylate wherein the alkyl group contains 1 to 4 carbon atoms and a photoinitiator. The resulting interpolymers are particularly useful in the preparation of highly absorbent personal hygiene and care products.
Inventors
- 👤 Paul J. George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:20
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; Y; Y10; Y10S; Y10S526/00; Y10S526/923
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
127 words
An interpolymer prepared by photopolymerization of: (a) 50 to 90 weight percent of acrylic acid, 70 to 100% of the carboxylic groups having been neutralized with an alkali metal or ammonium base prior to polymerization. (b) 2 to 25 weight percent of a higher acrylic ester monomer of the formula ##STR8## wherein R' is hydrogen, methyl or ethyl and R is an alkyl group of 10 to 30 carbon atoms, (c) 5 to 30 weight percent of a lower acrylic ester monomer of the formula ##STR9## wherein R" is a lower alkyl group having 1 to 8 carbon atoms, 0 to 50 percent of said lower acrylic ester being replaced by acrylic or methacrylic nitrile or amide, and (d) 0.01 to 5 weight percent of a photoinitiator.
Claim 2
Dependent Claim
127 words
An interpolymer prepared by photopolymerization of: (a) 50 to 90 weight percent of acrylic acid, 70 to 100% of the carboxylic groups having been neutralized with an alkali metal or ammonium base prior to polymerization. (b) 2 to 25 weight percent of a higher acrylic ester monomer of the formula ##STR8## wherein R' is hydrogen, methyl or ethyl and R is an alkyl group of 10 to 30 carbon atoms, (c) 5 to 30 weight percent of a lower acrylic ester monomer of the formula ##STR9## wherein R" is a lower alkyl group having 1 to 8 carbon atoms, 0 to 50 percent of said lower acrylic ester being replaced by acrylic or methacrylic nitrile or amide, and (d) 0.01 to 5 weight percent of a photoinitiator.
Claim 3
Dependent Claim
14 words
A composition of claim 1 containing additionally 0.1 to 5 percent of a dispersant.
Claim 4
Dependent Claim
103 words
An interpolymer of claim 2, wherein (a) acrylic acid is in the amount of from 65 to 85 weight percent, (b) the higher acrylic ester is an acrylate or methacrylate wherein R is an alkyl group of 16 to 21 carbon atoms, said ester being in the amount of from 5 to 20 percent, (c) the lower acrylic ester is an alkyl acrylate or methacrylate which is in the amount of from 5 to 20 percent, (d) the photoinitiator is in the amount of from 0.3 to 1.0 percent, and (e) the dispersant is in the amount of from 0.1 to 1 percent.
Claim 5
Dependent Claim
31 words
An interpolymer of claim 3 wherein (b) the higher acrylic ester is selected from lauryl or stearyl acrylate or methacrylate, and (c) the lower acrylic ester is methyl acrylate or methacrylate.
Claim 6
Dependent Claim
19 words
An interpolymer of claim 3 wherein the photoinitiator is 2,2-dimethoxy-2-phenylacetophenone, N,n'-bis(diethylamino)bgenzophenone, benzophenone, benzoin ethyl ether, or a mixture thereof.
Claim 7
Dependent Claim
76 words
An interpolymer of claim 1 prepared from (a) 83 weight percent of acrylic acid, 80 to 100% of the carboxylic groups having been neutralized, (b) 7 weight percent of lauryl or stearyl methacrylate, or tridecyl acrylate, (c) 10 weight percent of methyl acrylate or methacrylate, (d) 0.3 to 1.0 weight percent of 2,2-dimethoxy 2-phenylacetophenone, N,N'-bis(diethylamino)benzophenone, benzophenone or benzoin ethyl ether, and benzophenone or benzoin ethyl ether, and (e) 0.1 to 0.3 weight percent of a dispersant.
Claim 8
Dependent Claim
71 words
An interpolymer of claim 1 prepared from (a) 78 weight percent of acrylic acid, 80 to 100% of the carboxylic groups having been neutralized, (b) 7 weight percent of lauryl or stearyl methacrylate or tridecyl acrylate, (c) 15 weight percent of methyl acrylate or methyl methacrylate, (d) 0.3 to 1.0 weight percent of 2,2-dimethoxy 2-phenylacetophenone, N,N'-bis(diethylamino)benzophenone, benzophenone or benzoin ethyl ether, and (e) 0.1 to 0.3 weight percent of a dispersant.
Claim 9
Dependent Claim
18 words
An interpolymer of claim 1 or 3 containing additionally up to 15 weight percent of a cross-linking agent.
Claim 10
Dependent Claim
18 words
An interpolymer of claim 1 in the form of a film which is highly absorbent of aqueous liquids.
Claim 11
Dependent Claim
18 words
An interpolymer of claim 1 in the form of a fiber which is highly absorbent of aqueous liquids.
Claim 12
Dependent Claim
28 words
An article of manufacture designed for absorbing body fluids comprising an absorbent cellulose material and a polymer of claim 1 in the form of a film or fibers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-10 | 1983-03-12 | 1983-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-10 | 1987-03-12 | 1987-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-10 | 1991-03-12 | 1991-09-11 | $7700.00 | Window Closed / Lapsed |