US4199524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable liquid carbodiimide-containing polyisocyanate compositions
Assignee: BASF Corp
•
Filing: 1978-10-30
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Granted: 1980-04-22
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Expires: 1998-10-30
Abstract
Abstract Highly stable liquid 4,4'-diphenylmethane diisocyanate (MDI) containing MDI-carbodiimide adducts are prepared by heating MDI at a temperature of from 180 DEG C. to 250 DEG C. for a period of from one hour to ten hours in the presence of tris(chloromethyl)phosphine oxide and thereafter equilibrating the adduct formation. Equilibration can occur by any of several methods, i.e., by cooling the composition to a temperature of from 60 DEG C. to 90 DEG C. within twenty minutes, maintaining the composition at this temperature for a period of from one hour to four hours and thereafter cooling the composition to room temperature or by cooling the composition to a temperature less than 100 DEG C. within twenty minutes, further cooling to room temperature, and maintaining the composition at room temperature for one week to two weeks. The resulting compositions have very low sediment contents and are particularly useful in the preparation of microcellular polyurethane foams.
Inventors
- 👤 Robert L. Schaaf
- 👤 Peter T. Kan
- 👤 Moses Cenker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:14
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C08G18/721; C08G18/725
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
A highly stable liquid 4,4'-diphenylmethane diisocyanate composition containing diphenylmethane diisocyanate-carbodiimide adducts having an isocyanate content of from 20 to 32 percent by weight prepared by heating 4,4'-diphenylmethane diisocyanate or crude mixtures thereof at a temperature between 180° C. and 250° C. for a period of from one hour to ten hours in the presence of from 0.001 part to 0.05 part per 100 parts of said diisocyanate of tris(chloromethyl)phosphine oxide and thereafter equilibrating the adduct formation.
Claim 2
Dependent Claim
76 words
A highly stable liquid 4,4'-diphenylmethane diisocyanate composition containing diphenylmethane diisocyanate-carbodiimide adducts having an isocyanate content of from 20 to 32 percent by weight prepared by heating 4,4'-diphenylmethane diisocyanate or crude mixtures thereof at a temperature between 180° C. and 250° C. for a period of from one hour to ten hours in the presence of from 0.001 part to 0.05 part per 100 parts of said diisocyanate of tris(chloromethyl)phosphine oxide and thereafter equilibrating the adduct formation.
Claim 3
Dependent Claim
44 words
The composition of claim 1 wherein the adduct formation is equilibrated by cooling the composition to a temperature between 60° C. and 90° C. within twenty minutes, maintaining the composition at this temperature for one to four hours and thereafter cooling to room temperature.
Claim 4
Dependent Claim
43 words
The composition of claim 1 wherein the adduct formation is equilibrated by cooling the composition to a temperature less than 100° C. within twenty minutes, further cooling to room temperature and maintaining the composition at room temperature for one week to two weeks.
Claim 5
Dependent Claim
16 words
The composition of claim 1 wherein the reaction temperature is between 200° C. and 230° C.
Claim 6
Dependent Claim
15 words
The composition of claim 1 wherein the reaction time is from two to six hours.
Claim 7
Dependent Claim
30 words
The composition of claim 2 wherein the adduct formation is equilibrated by cooling to a temperature of 80° C. within ten minutes and maintained at that temperature for two hours.
Claim 8
Dependent Claim
28 words
A highly stable liquid polyisocyanate composition comprising from 15 to 75 weight percent of a composition of claim 1 and 85 to 25 weight percent of 4,4'-diphenylmethane diisocyanate.
Claim 9
Dependent Claim
76 words
A process for the preparation of highly stable liquid polyisocyanate compositions having an isocyanate content of from 20 to 32 percent by weight which comprises heating 4,4'-diphenylmethane diisocyanate or crude mixtures thereof at a temperature between 180° C. and 250° C. for a period of from one hour to ten hours in the presence of from 0.001 part to 0.05 part per 100 parts of said diisocyanate of tris(chloromethyl)phosphine oxide and thereafter equilibrating the adduct formation.
Claim 10
Dependent Claim
76 words
A process for the preparation of highly stable liquid polyisocyanate compositions having an isocyanate content of from 20 to 32 percent by weight which comprises heating 4,4'-diphenylmethane diisocyanate or crude mixtures thereof at a temperature between 180° C. and 250° C. for a period of from one hour to ten hours in the presence of from 0.001 part to 0.05 part per 100 parts of said diisocyanate of tris(chloromethyl)phosphine oxide and thereafter equilibrating the adduct formation.
Claim 11
Dependent Claim
44 words
The process of claim 8 wherein the adduct formation is equilibrated by cooling the composition to a temperature between 60° C. and 90° C. within twenty minutes, maintaining the composition at this temperature for one to four hours and thereafter cooling to room temperature.
Claim 12
Dependent Claim
43 words
The process of claim 8 wherein the adduct formation is equilibrated by cooling the composition to a temperature less than 100° C. within twenty minutes, further cooling to room temperature and maintaining the composition at room temperature for one week to two weeks.
Claim 13
Dependent Claim
16 words
The process of claim 8 wherein the reaction temperature is between 200° C. and 230° C.
Claim 14
Dependent Claim
15 words
The process of claim 8 wherein the reaction time is from two to six hours.
Claim 15
Dependent Claim
30 words
The process of claim 9 wherein the adduct formation is equilibrated by cooling to a temperature of 80° C. within ten minutes and maintained at that temperature for two hours.
References Cited (Backward Citations)
US3366661A
Cited
US3761502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |