Patent US4032468A successfully refreshed from Google Patents.
US4032468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrolytically stable urethane foam precursors
Assignee: Air Products and Chemicals Inc
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Filing: 1976-09-13
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Granted: 1977-06-28
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Expires: 1996-09-13
Abstract
Abstract The hydrolytic stability of catalyst-containing precursors for both flexible and rigid polyurethane foams wherein the catalyst is a tin compound is considerably increased when the catalyst is a triorganotin compound wherein the hydrocarbon groups bonded to the tin atom are methyl or methoxymethyl.
Inventors
- 👤 Kenneth Treadwell
- 👤 Melvin H. Gitlitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:56
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/24; C08G18/242; C08G2110/00; C08G2110/0008; C08G2110/0025; C08G2110/0083
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A hydrolytically stable precursor for preparing flexible or rigid cellular polyurethanes, said precursor consisting essentially of 100 parts by weight of a polyalkylene polyol, between 0.5 and 5 parts of water, between 0.05 and 0.5 parts of a foaming catalyst, between 0.05 and 2 parts of a silicone surfactant and between 0.05 and 0.5 parts of a gel catalyst, said gel catalyst being selected from the group consisting of organotin compounds of the formulae R a SnX 4 -- a , R 2 SnO and (R 3 Sn) 2 O wherein R is CH 3 -- or CH 3 OCH 2 --, X is selected from the group consisting of the chlorine, bromine and iodine atoms and radicals of the formula --OOCCH 3 or --OOCCH 2 CH 3 and a is the integer 2 or 3.
Claim 2
Dependent Claim
136 words
A hydrolytically stable precursor for preparing flexible or rigid cellular polyurethanes, said precursor consisting essentially of 100 parts by weight of a polyalkylene polyol, between 0.5 and 5 parts of water, between 0.05 and 0.5 parts of a foaming catalyst, between 0.05 and 2 parts of a silicone surfactant and between 0.05 and 0.5 parts of a gel catalyst, said gel catalyst being selected from the group consisting of organotin compounds of the formulae R a SnX 4 -- a , R 2 SnO and (R 3 Sn) 2 O wherein R is CH 3 -- or CH 3 OCH 2 --, X is selected from the group consisting of the chlorine, bromine and iodine atoms and radicals of the formula --OOCCH 3 or --OOCCH 2 CH 3 and a is the integer 2 or 3.
Claim 3
Dependent Claim
17 words
A hydrolytically stable precursor as described in claim 1 wherein X is chlorine or --OOCCH 3 .
Claim 4
Dependent Claim
13 words
A hydrolytically stable precursor as described in claim 2 wherein R is methyl.
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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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |