US4780512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane acrylate compositions
Assignee: Tyndale Plains Hunter Ltd
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Filing: 1987-10-09
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Granted: 1988-10-25
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Expires: 2007-10-09
Abstract
Abstract Polyurethane acrylate compositions are obtained by reacting 100 parts of a hydrophilic polyurethane resin in the presence of from about 10 to about 50 parts of an acrylate. The resulting products will form a hydrogel upon immersion in water and are permeable to gases, ions and other low molecular weight species. The hydrophilic polyurethane acrylate compositions may be molded to form shaped products that swell in water and have a variety of uses.
Inventors
- 👤 Francis E. Gould
- 👤 Christian W. Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08F; C08F299/00; C08F299/02; C08F299/06; C08G18/40; C08G18/48; C08G18/4833; C08G2210/00; Y; Y10; Y10S; Y10S521/00; Y10S521/905
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
A hydrophilic polyurethane acrylate composition which is alcohol soluble will form a hydrogel upon immersion in water and is permeable to gases, ions and nonionic materials of various molecular weights, said composition comprising about 100 parts by weight of a hydrophilic polyurethane resin having an NCO/OH ratio of 0.85/1 to 1/1 and from about 10 to about 50 parts by weight of a monoacrylate whererin said monoacrylate is a monoacrylic or monomethacrylic ester of an alcohol having less than 13 carbon atoms.
Claim 2
Dependent Claim
82 words
A hydrophilic polyurethane acrylate composition which is alcohol soluble will form a hydrogel upon immersion in water and is permeable to gases, ions and nonionic materials of various molecular weights, said composition comprising about 100 parts by weight of a hydrophilic polyurethane resin having an NCO/OH ratio of 0.85/1 to 1/1 and from about 10 to about 50 parts by weight of a monoacrylate whererin said monoacrylate is a monoacrylic or monomethacrylic ester of an alcohol having less than 13 carbon atoms.
Claim 3
Dependent Claim
14 words
The hydrophilic polyurethane acrylate composition of claim 1 wherein said acrylate is hydroxyethyl methacrylate.
Claim 4
Dependent Claim
14 words
The hydrophilic polyurethane acrylate composition of claim 1 wherein said acrylate is methyl methacrylate.
Claim 5
Dependent Claim
14 words
The hydrophilic polyurethane acrylate composition of claim 1 wherein said acrylate is methyl acrylate.
Claim 6
Dependent Claim
19 words
The hydrophilic polyurethane acrylate composition of claim 1 wherein said acrylate is about 17 weight percent of said composition.
Claim 7
Dependent Claim
14 words
The hydrophilic polyurethane acrylate composition of claim 5 wherein said acrylate is hydroxyethly methacrylate.
Claim 8
Dependent Claim
22 words
The hydrophilic polyurethane acrylate composition of claim 1 wherein said polyurethane resin is derived from a mixture of polyols and a diisocyanate.
Claim 9
Dependent Claim
24 words
The hydrophilic polyurethane acrylate composition of claim 7 wherein one of said polyols is a polyol having a number average molecular weight of 8,000.
Claim 10
Dependent Claim
17 words
The hydrophilic polyurethane acrylate composition of claim 1 which has been molded to form a desired shape.
Claim 11
Independent Claim
49 words
A method of preparing an alcohol soluble hydrophilic polyurethane acrylate composition which comprises reacting from about 10 to about 50 parts by weight of a monoacrylate in the presence of from about 100 parts by weight of a hydrophilic polyurethane resin having an NCO/OH ratio of 0.85/1 to 1/1.
Claim 12
Independent Claim
49 words
A method of preparing an alcohol soluble hydrophilic polyurethane acrylate composition which comprises reacting from about 10 to about 50 parts by weight of a monoacrylate in the presence of from about 100 parts by weight of a hydrophilic polyurethane resin having an NCO/OH ratio of 0.85/1 to 1/1.
Claim 13
Dependent Claim
20 words
The composition of claim 1 wherein the polyurethane resin has a number average molecular weight of about 18,000 to 24,000.
Claim 14
Dependent Claim
20 words
The method of claim 10 wherein the polyurethane resin has a number average molecular weight of about 18,000 to 24,000.
References Cited (Backward Citations)
US3297745A
Cited
US4359558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |