Patent US4490300A successfully refreshed from Google Patents.
US4490300A
Expired / Lapsed
US
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Liquid diphenylmethane diisocyanate compositions
Assignee: Bayer Corp
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Filing: 1983-09-30
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Granted: 1984-12-25
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Expires: 2003-09-30
Abstract
Abstract The 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 a diol of the formula, ##STR1## wherein R is a C 2 to a C 5 aliphatic radical, at a temperature of from 20° to 110° C., in a ratio such that the resultant product has an isocyanate group content of from 20 to 30%, by weight and to the products produced therefrom.
Inventors
- 👤 Gary F. Allen
- 👤 Richard S. Pantone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8012; C08G18/8019; C07; C07C; C07C263/00; C07C263/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 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 a diol of the formula, ##STR4## wherein R ia a C 2 to C 5 aliphatic radical, at a temperature of from 20° to 110° C., in a ratio such that the resultant product has an isocyanate group content of from 20 to 30%, by weight.
Claim 2
Dependent Claim
73 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 a diol of the formula, ##STR4## wherein R ia a C 2 to C 5 aliphatic radical, at a temperature of from 20° to 110° C., in a ratio such that the resultant product has an isocyanate group content of from 20 to 30%, by weight.
Claim 3
Dependent Claim
10 words
A process according to claim 1, wherein R is ##STR5##
Claim 4
Dependent Claim
10 words
A process according to claim 1, wherein R is ##STR6##
Claim 5
Dependent Claim
14 words
The process of claim 1, wherein the temperature is from 40° to 80° C.
Claim 6
Dependent Claim
14 words
The process of claim 4, wherein the temperature is from 50° to 70° C.
Claim 7
Dependent Claim
18 words
The process of claim 1, wherein the weight ratio of isocyanate to diol is from 5:1 to 15:1.
Claim 8
Dependent Claim
21 words
The process of claim 1, wherein the product has an isocyanate group content of from 22 to 28 percent by weight.
Claim 9
Dependent Claim
59 words
An isocyanate prepared by reacting pure diphenylmethane diisocyanate or crude diphenylmethane diisocyanate with a diol of the formula, ##STR7## wherein R is a C 2 to C 5 aliphatic radical, at a temperature of from 20° to 110° C., in a ratio such that the resultant product has an isocyanate group content of from 20 to 30%, by weight.
Claim 10
Dependent Claim
59 words
An isocyanate prepared by reacting pure diphenylmethane diisocyanate or crude diphenylmethane diisocyanate with a diol of the formula, ##STR7## wherein R is a C 2 to C 5 aliphatic radical, at a temperature of from 20° to 110° C., in a ratio such that the resultant product has an isocyanate group content of from 20 to 30%, by weight.
Claim 11
Dependent Claim
18 words
The product of claim 8 having an isocyanate group content of 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 |