Patent US3684770A successfully refreshed from Google Patents.
US3684770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Segmented polyurethane elastomers based on polyether and polyester diols
Assignee: Bayer AG
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Filing: 1970-07-30
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Granted: 1972-08-15
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Expires: 1990-07-30
Abstract
Abstract Polyurethane elastomers are prepared by reacting a prepolymer (A) of a polyether diol and a diisocyanate with a mixture (B) of a polyester diol and a lower molecular weight glycol at a temperature of from about 60*C. to about 180*C. The reaction product of (A) and (B) is resistant to separation and the polyurethane elastomers combine all of the advantageous properties of both polyether polyurethanes and polyester polyurethanes and are useful as foils and coatings and can be molded into a variety of elastomeric products.
Inventors
- 👤 Ernst Meisert
- 👤 Albert Awater
- 👤 Cornelius Muhlhausen
- 👤 Uwe Jens Dobereiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4812; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/902; Y10S528/906
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
11 words
The elastomer of claim 1 wherein the diisocyanate is 4,4''-diisocyanato diphenylmethane.
Claim 2
Dependent Claim
21 words
The elastomer of claim 1 wherein the polyether diol is a polypropylene glycol ether or a mixture of polypropylene glycol ethers.
Claim 3
Dependent Claim
20 words
The elastomer of claim 1 wherein the mixture (B) is a mixture of a polyester of adipic acid and butane-1,4-diol.
Claim 4
Dependent Claim
13 words
The elastomer of claim 1 wherein the polyester diol is a hexanediol polycarbonate.
Claim 5
Dependent Claim
10 words
The elastomer of claim 1 wherein the glycol is butane-1,4-diol.
References Cited (Backward Citations)
US2948691A
Cited
US2929800A
Cited
US2729618A
Cited
US2888432A
Cited
US2917489A
Cited
US3036042A
Cited
US2953539A
Cited
US3192185A
Cited
US3248373A
Cited
US3544524A
Cited
US3541183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |