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US3692813A
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US
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Stabilization of organic isocyanates
Assignee: Bayer AG
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Filing: 1970-01-02
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Granted: 1972-09-19
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Expires: 1990-01-02
Abstract
Abstract Organic isocyanates are stabilized against decomposition, which results in precipitate formation and discoloration, by the addition of a small amount of an organic isocyanate compound, preferably an oxycarbonyl isocyanate containing at least one -OCO-NCO group in the molecule. Polyurethane elastomers prepared from isocyanates stabilized in this manner also exhibit a very high resistance to hydrolysis.
Inventors
- 👤 Hermann Hagemann
- 👤 Erwin Muller
- 👤 Peter Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:04
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C07; C07C; C07C263/00; C07C263/18; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G18/70; C08G18/72; C08G18/77; C08G18/771
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
The composition of claim 1 wherein the oxycarbonyl isocyanate is selected from the group consisting of
Claim 2
Dependent Claim
14 words
The composition of claim 1 wherein the storage stable organic isocyanate is 4,4''-diphenylmethane diisocyanate.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |