Patent US3664979A successfully refreshed from Google Patents.
US3664979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane elastomer and method for preparation of same
Assignee: Kuraray Co Ltd
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Filing: 1969-12-15
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Granted: 1972-05-23
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Expires: 1989-12-15
Abstract
Abstract Polyurethane elastomers having excellent resistance to hydrolysis and which are readily wet coagulated are prepared via the reaction of polymeric diols having molecular weights of about 800 to about 5,000, organic diisocyanates and chain extenders selected from the group consisting of aliphatic diols having two to four carbon atoms. Said polymeric diols are polyester diols which are the reaction products of aliphatic dicarboxylic acids and mixed diols consisting of from 20 to 80 mol per cent of 2-ethyl hexane-1,3diol and from 80 to 20 mol per cent of a diol selected from the group consisting of diethylene glycol, ethylene glycol, propylene glycol and butylene glycol; or a mixture of said polyester diol and at most 50 weight per cent based on the mixture of polyalkylene ether glycols, such as polypropylene glycol or polytetramethylene glycol.
Inventors
- 👤 Masahisa Tanomura
- 👤 Kazuo Itoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:54
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664; C08G18/08; C08G18/10; C08G18/12; C08G18/40; C08G18/4009; C08G18/4018; C08G18/42; C08G18/4236; C08G18/4238; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T442/00; Y10T442/20; Y10T442/2033; Y10T442/2139; Y10T442/2148
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
The polyurethane elastomer according to claim 1 wherein said polyester diol is the reaction product of adipic acid and mixed diols comprising from 20 to 80 mol percent of 2-ethyl hexane-1,3-diol and from 80 to 20 mol percent of dipropylene glycol.
Claim 2
Dependent Claim
41 words
The polyurethane elastomer according to claim 1 wherein said polyester diol is the reaction product of adipic acid and mixed diols comprising from 20 to 80 mol percent of 2-ethyl hexane-1,3-diol and from 80 to 20 mol percent of ethylene glycol.
Claim 3
Dependent Claim
41 words
The polyurethane elastomer accordiNg to claim 1 wherein said polyester diol is the reaction product of adipic acid and mixed diols comprising from 20 to 80 mol percent of 2-ethyl hexane-1,3-diol and from 80 to 20 mol percent of butylene glycol.
Claim 4
Dependent Claim
38 words
The polyurethane elastomer according to claim 1 wherein said polyester diol is a reaction product of adipic acid and mixed diols comprising 20 to 80 mol percent of 2-ethyl hexane-1,3-diol and 80 to 20 percent of propylene glycol.
Claim 5
Dependent Claim
14 words
The polyurethane elastomer according to claim 1, wherein said chain extender is ethylene glycol.
Claim 6
Dependent Claim
27 words
The polyurethane elastomer according to claim 1, wherein the aliphatic dicarboxylic acid is selected from the group consisting of glutaric, adipic, pimelic, suberic, azelaic and sebacic acids.
Claim 7
Dependent Claim
14 words
A substrate coated or impregnated with the polyurethane elastomer as defined by claim 1.
Claim 8
Dependent Claim
13 words
A leather substitute comprised of the polyurethane elastomer as defined by claim 1.
Claim 9
Dependent Claim
175 words
In a polyurethane composition which is wet coagulable to form a microporous sheet having a smooth surface and resistance to hydrolysis by human perspiration, which comprises the reaction product of a polymeric diol having a molecular weight of from about 800 to 5,000, an organic diisocyanate and a chain extender selected from the group consisting of aliphatic diols having from two to four carbon atoms, the improvement comprising (a) the polymeric diol comprises an admixture of (i) from 50 to 100 weight percent of a polyester diol which is the reaction product of an aliphatic dicarboxylic acid and mixed diols comprising from 20 to 80 mol percent of 2-ethyl hexane-1,3-diol and from 80 to 20 mol percent of a diol selected from the group consisting of ethylene glycol, propylene glycol, dipropylene glycol, and butylene glycol, and (ii) from 50 to 0 weight percent of a polyalkylene ether glycol, (b) the organic diisocyanate is 4,4''-diphenylmethane diisocyanate and (c) the nitrogen content in said polyurethane elastomer is in the range from about 3.5 to 5.0 weight percent.
Claim 10
Dependent Claim
16 words
The polyurethane elastomer according to claim 10, wherein said polyalkylene ether glycol is polytetramethylene ether glycol.
Claim 11
Dependent Claim
16 words
The polyurethane elastomer according to claim 10, wherein said polyalkylene ether glycol is polypropylene ether glycol.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |