US3897401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid polyurethane reaction mixture
Assignee: Goodyear Tire and Rubber Co
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Filing: 1974-03-25
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Granted: 1975-07-29
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Expires: 1994-03-25
Abstract
Abstract A liquid polyurethane reaction mixture suitable for making rotary castings and characterized by a pot life of at least 30 minutes at 75*F. but less than 16 minutes at 150*F., the mixture comprising polypropylene ether diol, 4,4''-methylene bis(cyclohexyl isocyanate), and a curative comprising butanediol1,4 or a liquid mixture of trimethylol propane and butanediol1,4, or a polypropylene ether diol of 800 to 1,500 molecular weight, and the catalyst of di(alkyl) tin-S,S''-bis(alkyl mercapto alkylate).
Inventors
- 👤 Harold R Ringler
- 👤 David R Macfarland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:36
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/758; C08G18/08; C08G18/10; C08G18/16; C08G18/22; C08G18/24; C08G18/242
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
132 words
A LIQUID POLYURETHANE REACTION MIXTURE CHARACTERIZED BY A POT LIFE OF AT LEAST 30 MINUTES AT 75*F. BUT LESS THAN 16 MINUTES AT 150*F., CONSISTING OF A MIXTURE OF A REACTION PRODUCT OF ONE MOL OF A 700 TO 2,000 MOLECULAR WEIGHT POLYPROPYLENE ETHER DIOL WITH 2.5 TO 3.5 MOLS OF 4,4''-METHYLENE BIS-(CYCLOHEXYL ISOCYANATE), SUFFICIENT CURATIVE TO BE EQUIVALENT TO 90 TO 99 MOL PERCENT OF THE EXCESS ISOCYANATE IN THE REACTION PRODUCT AND 0.05 TO 0.25 WEIGHT PERCENT OF A CATALYST OF DI(ALKYL)TIN-S,S''-BIS(ALKYL MERCAPTO ALKYLATE) WHERE THE ALKYL RADICAL CONTAINS FROM ONE TO 20 CARBON ATOMS AND THE ALKYLATE RADICAL CONTAINS FROM ONE TO 20 CARBON ATOMS AND THE CURATIVE IS BUTANEDIOL-1,4 OR A LIQUID MIXTURE OF TRIMETHYLOL PROPANE AND BUTANEDIOL-1,4 OR POLYPROPYLENE ETHER DIOL OF 800 TO 1,500 MOLECULAR WEIGHT.
Claim 2
Dependent Claim
132 words
A LIQUID POLYURETHANE REACTION MIXTURE CHARACTERIZED BY A POT LIFE OF AT LEAST 30 MINUTES AT 75*F. BUT LESS THAN 16 MINUTES AT 150*F., CONSISTING OF A MIXTURE OF A REACTION PRODUCT OF ONE MOL OF A 700 TO 2,000 MOLECULAR WEIGHT POLYPROPYLENE ETHER DIOL WITH 2.5 TO 3.5 MOLS OF 4,4''-METHYLENE BIS-(CYCLOHEXYL ISOCYANATE), SUFFICIENT CURATIVE TO BE EQUIVALENT TO 90 TO 99 MOL PERCENT OF THE EXCESS ISOCYANATE IN THE REACTION PRODUCT AND 0.05 TO 0.25 WEIGHT PERCENT OF A CATALYST OF DI(ALKYL)TIN-S,S''-BIS(ALKYL MERCAPTO ALKYLATE) WHERE THE ALKYL RADICAL CONTAINS FROM ONE TO 20 CARBON ATOMS AND THE ALKYLATE RADICAL CONTAINS FROM ONE TO 20 CARBON ATOMS AND THE CURATIVE IS BUTANEDIOL-1,4 OR A LIQUID MIXTURE OF TRIMETHYLOL PROPANE AND BUTANEDIOL-1,4 OR POLYPROPYLENE ETHER DIOL OF 800 TO 1,500 MOLECULAR WEIGHT.
Claim 3
Dependent Claim
28 words
The liquid polyurethane reaction mixture of claim 1 wherein the polypropylene ether diol has a molecular weight of 800 to 1, 500 and the catalyst is di(N-octyl)tin-S,S''-bis(isooctyl mercaptoacetate).
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |