Patent US4614786A successfully refreshed from Google Patents.
US4614786A
Expired / Lapsed
US
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Stable isocyanate/epoxide prepolymers and thermoset polyurethanes produced therefrom
Assignee: Ashland LLC
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Filing: 1985-08-12
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Granted: 1986-09-30
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Expires: 2005-08-12
Abstract
Abstract A process for preparing a polyurethane by reaction of A, a prepolymer prepared by the low temperature reaction of a polyisocyanate and a polyepoxide, with B, a polyol, is described.
Inventors
- 👤 Anil B. Goel
- 👤 Peggy A. Blackburn
- 👤 Timothy A. Tufts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:35
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/58; C08G18/003; C08G18/08; C08G18/10; C08G2115/00; C08G2115/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
The process for preparing a polyurethane comprising reacting A. A prepolymer prepared by the low temperature reaction of a polyisocyanate and a polyepoxide containing no or very low levels of hydroxyl groups in the absence of any catalyst with B. A polyol.
Claim 2
Dependent Claim
42 words
The process for preparing a polyurethane comprising reacting A. A prepolymer prepared by the low temperature reaction of a polyisocyanate and a polyepoxide containing no or very low levels of hydroxyl groups in the absence of any catalyst with B. A polyol.
Claim 3
Dependent Claim
26 words
The process of claim 1 in which A is carried out at a temperature in the range of from about room temperature to about 100° C.
Claim 4
Dependent Claim
24 words
The process of claim 2 wherein the polyepoxide contains less than 20% by weight of hydroxyl groups based on the weight of epoxy groups.
Claim 5
Dependent Claim
28 words
The process of claim 3 wherein the equivalent ratio of isocyanate to epoxy groups in the prepolymer of A is in the range of from 1:0.001 to 1:1.
Claim 6
Dependent Claim
26 words
The process of claim 3 wherein the equivalent ratio of isocyanate to combined epoxy and hydroxy groups is in the range of from 0.8:1 to 3:1.
Claim 7
Dependent Claim
25 words
The process of claim 1 A and B carried out at a temperature in the range of from about room temperature to about 200° C.
Claim 8
Dependent Claim
32 words
The process of claim 5 wherein the polyisocyanate is methylene bis(phenyl isocyanate), the polyepoxide is the diglycidyl ether of bisphenol-A, and the polyol is a mixture of dipropylene glycol and trimethylol propane.
Claim 9
Dependent Claim
10 words
The polymer prepared according to the process of claim 1.
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) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |