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US4490301A
Expired / Lapsed
US
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Liquid diphenylmethane diisocyanate compositions
Assignee: Bayer Corp
•
Filing: 1983-09-30
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Granted: 1984-12-25
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Expires: 2003-09-30
Abstract
Abstract The present invention is directed to a process for the production of an isocyanate which is both stable and liquid at room temperature comprising reacting pure diphenylmethane diisocyanate or crude diphenylmethane diisocyanate with the monoallyl ether of trimethylolpropane at a temperature of from 20° to 110° C., in such a ratio that the resultant product has an isocyanate group content of from 20 to 30%, by weight, and the product resulting therefrom.
Inventors
- 👤 Richard S. Pantone
- 👤 Helmut F. Reiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/81; C08G18/8141; C08G18/815
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A process for the production of an isocyanate which is both stable and liquid at room temperature comprising reacting pure diphenylmethane diisocyanate or crude diphenylmethane diisocyanate with the monoallyl ether of trimethylolpropane at a temperature of from 20° to 110° C., in such a ratio that the resultant product has an isocyanate group content of from 20 to 30%, by weight.
Claim 2
Dependent Claim
61 words
A process for the production of an isocyanate which is both stable and liquid at room temperature comprising reacting pure diphenylmethane diisocyanate or crude diphenylmethane diisocyanate with the monoallyl ether of trimethylolpropane at a temperature of from 20° to 110° C., in such a ratio that the resultant product has an isocyanate group content of from 20 to 30%, by weight.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the temperature is from 40° to 80° C.
Claim 4
Dependent Claim
14 words
The process of claim 2, wherein the temperature is from 50° to 70° C.
Claim 5
Dependent Claim
21 words
The process of claim 1, wherein the isocyanate group content of the product is from 22 to 28 perecent by weight.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein the weight ratio of the isocyanate to the monoallyl ether of trimethylolpropane is from 5:1 to 15:1.
Claim 7
Dependent Claim
47 words
An isocyanate prepared by reacting pure diphenylmethane diisocyanate or crude diphenylmethane diisocyanate with the monoallyl ether of trimethylolpropane at a temperature of from 20° to 110° C., in such a ratio that the resultant product has an isocyanate group content of from 20 to 30%, by weight.
Claim 8
Dependent Claim
47 words
An isocyanate prepared by reacting pure diphenylmethane diisocyanate or crude diphenylmethane diisocyanate with the monoallyl ether of trimethylolpropane at a temperature of from 20° to 110° C., in such a ratio that the resultant product has an isocyanate group content of from 20 to 30%, by weight.
Claim 9
Dependent Claim
18 words
The product of claim 6 wherein the isocyanate group content is from 22 to 28 percent by weight.
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |