US4463141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyether carbonate diols and polyurethanes prepared therefrom
Assignee: EIDP Inc
•
Filing: 1983-01-24
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Granted: 1984-07-31
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Expires: 2003-01-24
Abstract
Abstract Polyether carbonate diols are prepared by coupling segments of a poly(tetramethylene ether) glycol with a dialkyl carbonate, 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 02:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/44
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
A polyether carbonate diol represented by the structure ##STR2## where R is --CH 2 -- 4 n is 7-45, and m is 0-18.
Claim 2
Dependent Claim
23 words
A polyether carbonate diol represented by the structure ##STR2## where R is --CH 2 -- 4 n is 7-45, and m is 0-18.
Claim 3
Dependent Claim
13 words
The diol of claim 1 where n is 9-40 and m is 0-10.
Claim 4
Dependent Claim
23 words
A polyurethane which is the reaction product of (A) a diol of claim 1, (B) an organic polyisocyanate, and (C) a chain extender,
Claim 5
Dependent Claim
14 words
The polyurethane of claim 3 wherein the polyisocyanate is diphenylmethane-4,4'-diisocyanate or a toluene diisocyanate.
Claim 6
Dependent Claim
20 words
The polyurethane of claim 3 wherein the chain extender is an aliphatic polyol, an aliphatic polyamine or an aromatic polyamine.
Claim 7
Dependent Claim
17 words
The polyurethane of claim 5 wherein the chain extender is an aliphatic diol of 2-10 carbon atoms.
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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |