Patent US4476293A successfully refreshed from Google Patents.
US4476293A
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Polymeric carbonate diols of copolyether glycols and polyurethanes prepared therefrom
Assignee: EIDP Inc
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Filing: 1983-01-24
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Granted: 1984-10-09
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Expires: 2003-01-24
Abstract
Abstract Polymeric carbonate diols are prepared by coupling segments of copolyether glycols with a dialkyl carbonate, with a cyclic carbonate, or with phosgene. The carbonate diols are useful in preparing polyurethanes.
Inventors
- 👤 Ivan M. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
41 words
A polymeric carbonate diol made by coupling segments of a tetrahydrofuran/alkylene oxide copolymer with a dialkyl carbonate whose alkyl group contains 1-4 carbon atoms or phosgene, the diol having a number average molecular weight of 1200-12,000, as determined by hydroxyl number.
Claim 2
Dependent Claim
41 words
A polymeric carbonate diol made by coupling segments of a tetrahydrofuran/alkylene oxide copolymer with a dialkyl carbonate whose alkyl group contains 1-4 carbon atoms or phosgene, the diol having a number average molecular weight of 1200-12,000, as determined by hydroxyl number.
Claim 3
Dependent Claim
18 words
The carbonate diol of claim 1 in which the alkylene oxide is ethylene oxide or a propylene oxide.
Claim 4
Dependent Claim
32 words
A polyurethane which is the reaction product of (a) a polymeric carbonate diol of claim 1, (b) an organic polyisocyanate, and (c) a chain extender which is an aliphatic polyol or polyamine.
Claim 5
Dependent Claim
32 words
A polyurethane which is the reaction product of (a) a polymeric carbonate diol of claim 2, (b) an organic polyisocyanate, and (c) a chain extender which is an aliphatic polyol or polyamine.
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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |