US4051111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection moldable polyurethanes
Assignee: Goodrich Corp
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Filing: 1976-08-20
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Granted: 1977-09-27
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Expires: 1996-08-20
Abstract
Abstract Novel polyurethanes particularly useful in forming injection molded articles having a good balance of physical properties including, particularly, greater stiffness, low temperature impact and elevated heat distortion resistance are obtained by reacting hydroxyl-terminated polyesters or polylactones having molecular weights greater than about 2800, a cyclic diisocyanate and an aliphatic diol at decreased reaction temperatures.
Inventors
- 👤 John Ambrose Holloway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:53
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
140 words
Polyurethanes having low temperature impact and elevated heat distortion resistance with a Vicat value greater than 115° C., stiffness at 160° F. of greater than 4,000 psi and a 250° oven sag of less than 50 mm, prepared by reacting a hydroxyl-terminated polyester or polylactone macroglycol having a molecular weight greater than 2800 to about 8000, an aliphatic diol containing 2 to 6 carbon atoms present in amount so that the average hydroxyl molecular weight of a mixture of the hydroxyl-terminated macroglycol and butanediol is about 450 to less than about 650, and more than a molar equivalent of a cyclic diisocyanate, reacted together at a temperature below 160° C. in two stages, first at a temperature of greater than 50° C. to less than 100° C. and then at less than 160° C. to substantially complete the polyurethane reaction.
Claim 2
Dependent Claim
140 words
Polyurethanes having low temperature impact and elevated heat distortion resistance with a Vicat value greater than 115° C., stiffness at 160° F. of greater than 4,000 psi and a 250° oven sag of less than 50 mm, prepared by reacting a hydroxyl-terminated polyester or polylactone macroglycol having a molecular weight greater than 2800 to about 8000, an aliphatic diol containing 2 to 6 carbon atoms present in amount so that the average hydroxyl molecular weight of a mixture of the hydroxyl-terminated macroglycol and butanediol is about 450 to less than about 650, and more than a molar equivalent of a cyclic diisocyanate, reacted together at a temperature below 160° C. in two stages, first at a temperature of greater than 50° C. to less than 100° C. and then at less than 160° C. to substantially complete the polyurethane reaction.
Claim 3
Dependent Claim
122 words
The polyurethane of claim 1 wherein the macroglycol is a hydroxyl-terminated polyester of aliphatic dicarboxylic acids of the formula HOOC--R--COOH where R is a alkylidene radical containing 2 to 8 carbon atoms, and aliphatic glycols containing greater than 2 and up to 10, carbon atoms, the aliphatic diol is butanediol-1,4, and the cyclic diisocyanate is a dicyclic aromatic diisocyanate present in amounts of greater than about 2 up to about 10% molar excess of the diisocyanate required to react with said polyester and aliphatic glycol and the reaction is conducted initially at a temperature above 60° C. to less than 90° C. and then at a temperature above about 120° C. but less than 150° C. to substantially complete the polyurethane reaction.
Claim 4
Dependent Claim
62 words
A polyurethane of claim 2 wherein the polyester is hydroxyl-terminated poly(tetramethylene)adipate having a molecular weight of about 3000 to about 4000, the average molecular weight of the mixture of polyester and aliphatic glycol is from about 500 to about 600, and the aromatic diisocyanate is diphenylmethane-4,4'-diisocyanate present in amount of at least 3 mol percent excess diisocyanate based on the total diols.
Claim 5
Dependent Claim
40 words
A polyurethane of claim 3 wherein the molecular weight of the polyester is about 3100 to 3900, the blend molecular weight is about 550 and the amount of diisocyanate used is between about 104 and 110% of the other reactants.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |