US3892713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cure of polyurethanes with mixed curatives comprising hydroxy tertiary amines
Assignee: Uniroyal Chemical Co Inc
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Filing: 1974-03-25
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Granted: 1975-07-01
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Expires: 1994-03-25
Abstract
Abstract Polyurethane prepolymers are cured with a mixture of A. hydroquinone bis(beta-hydroxyethyl) ether, OR B. 1,4-butanediol, with, C. phenyl diethanol amine, and D. triisopropanol amine. This curative mixture makes possible short molding times and good physical properties.
Inventors
- 👤 John Burkus
- 👤 Robert G Leclerc
- 👤 Louis V Esposito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:51
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
85 words
A METHOD OF CURING AN ISOCYANATE TERMINATED POLYURETHANE PROPOLYMER COMPRISING ADMIXING THEREWITH, IN AMOUNT SUFFICIENT TO CURE THE PREPOLYMER, (A) HYDROQUINONE BIS (BETA-HYDROXYETHYL) ETHER OR (B) 1,4-BUTANEDIOL, WITH (C) PHENYL DIETHANOL AMINE AND (D) TRIISOPROPANOL AMINE, THE RATIO OF (C) TO (D) BEING FROM 98:2 TO 50950 BY WEIGHT, THE EQUIVALENT RATIO OF (A) TO (C) PLUS (D) BEING FROM 17:1 TO 295:18 AND THE EQUIVALENT RATIO OF (B) TO (C) PLUS (D) BEING FROM 18:1 TO 2.5:1, AND SUBJECTING THE MIXTURE TO CURING CONDITIONS.
Claim 2
Independent Claim
85 words
A METHOD OF CURING AN ISOCYANATE TERMINATED POLYURETHANE PROPOLYMER COMPRISING ADMIXING THEREWITH, IN AMOUNT SUFFICIENT TO CURE THE PREPOLYMER, (A) HYDROQUINONE BIS (BETA-HYDROXYETHYL) ETHER OR (B) 1,4-BUTANEDIOL, WITH (C) PHENYL DIETHANOL AMINE AND (D) TRIISOPROPANOL AMINE, THE RATIO OF (C) TO (D) BEING FROM 98:2 TO 50950 BY WEIGHT, THE EQUIVALENT RATIO OF (A) TO (C) PLUS (D) BEING FROM 17:1 TO 295:18 AND THE EQUIVALENT RATIO OF (B) TO (C) PLUS (D) BEING FROM 18:1 TO 2.5:1, AND SUBJECTING THE MIXTURE TO CURING CONDITIONS.
Claim 3
Dependent Claim
50 words
A method as in claim 1 in which the ratio of (C) to (D) is from 95:5 to 80:20 by weight, the equivalents ratio of (A) to (C) plus (D) is from 9:1 to 3.5:1, and the equivalents ratio of (B) to (C) plus (D) is from 9:1 to 2.5:1.
Claim 4
Dependent Claim
20 words
A curative mixture for isocyanate terminated prepolymers comprising (A) or (B), with (C) and (D) as recited in claim 1.
Claim 5
Dependent Claim
8 words
The product of the method of claim 1.
Claim 6
Independent Claim
141 words
A method of making shaped articles from a curable liquid polyurethane prepolymer having available isocyanate groups comprising admixing therewith, in amount sufficient to cure the prepolymer, a curative blend of (A) hydroquinone bis (beta-hydroxyethyl) ether or (B) 1,4with (C) phenyl diethanolamine and (D) triisopropanol amine, the ratio of (C) to (D) being from 98:2 to 50:50 by weight, the equivalents ratio of (A) to (C) plus (D) being from 17:1 to 2.5:1 and the equivalents ratio of (B) to (C) plus (D) being from 18:1 to 2.5:1, charging the mixture to a mold and subjecting to curing conditions to cure the mixture in a desired shape in the mold, whereby the mixture in the mold passes quickly through a cheesy stage to a stage wherein it has sufficiently high physical properties to be removed from the mold without damage or distortion.
Claim 7
Independent Claim
141 words
A method of making shaped articles from a curable liquid polyurethane prepolymer having available isocyanate groups comprising admixing therewith, in amount sufficient to cure the prepolymer, a curative blend of (A) hydroquinone bis (beta-hydroxyethyl) ether or (B) 1,4with (C) phenyl diethanolamine and (D) triisopropanol amine, the ratio of (C) to (D) being from 98:2 to 50:50 by weight, the equivalents ratio of (A) to (C) plus (D) being from 17:1 to 2.5:1 and the equivalents ratio of (B) to (C) plus (D) being from 18:1 to 2.5:1, charging the mixture to a mold and subjecting to curing conditions to cure the mixture in a desired shape in the mold, whereby the mixture in the mold passes quickly through a cheesy stage to a stage wherein it has sufficiently high physical properties to be removed from the mold without damage or distortion.
Claim 8
Dependent Claim
29 words
A method as in claim 5 wherein the said prepolymer is a reaction product of a polytetramethylene glycol having an hydroxyl number from 200 to 50 and p,p''-diphenylmethane diisocyanate.
Claim 9
Dependent Claim
43 words
A method as in claim 6 wherein the curative is (A) plus (C) and (D), the ratio of (C) to (D) being from 95:5 to 80:20 by weight and the equivalents ratio of (A) to (C) plus (D) beinG from 9:1 to 3.5:1.
Claim 10
Dependent Claim
43 words
A method as in claim 6 wherein the curative is (B) plus (C) and (D), the ratio of (C) to (D) being from 95:5 to 80:20 by weight and the equivalents ratio of (B) to (C) plus (D) being from 90:1 to 2.5:1.
Claim 11
Dependent Claim
30 words
A method as in claim 5 wherein the said prepolymer is a reaction product of a glycol-adipic acid polyester having an hydroxyl number of 50 to 100 and p,p''-diphenylmethane diisocyanate.
Claim 12
Dependent Claim
43 words
A method as in claim 9 wherein the curative is (A) plus (C) and (D), the ratio of (C) to (D) being from 95:5 to 80:20 by weight and the equivalents ratio of (A) to (C) plus (D) being from 9:1 to 3.5:1.
Claim 13
Dependent Claim
43 words
A method as in claim 9 wherein the curative is (B) plus (C) and (D), the ratio of (C) to (D) being from 95:5 to 80:20 by weight and the equivalents ratio of (B) to (C) plus (D) being from 9:1 to 2.5:1.
References Cited (Backward Citations)
US3044971A
Cited
US3476933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |