Patent US3907780A successfully refreshed from Google Patents.
US3907780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of carbodiimide-containing isocyanates
Assignee: Imperial Chemical Industries Ltd
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Filing: 1974-01-02
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Granted: 1975-09-23
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Expires: 1994-01-02
Abstract
Abstract A process for converting at least a proportion of the isocyanate groups in an organic isocyanate into carbodiimide groups by heating the organic isocyanate with an organic phosphorus containing catalyst for the carbodiimide-forming reaction and an active hydrogen containing compound as co-catalyst. Further reaction of the carbodiimide groups with isocyanate groups results in the formation of uretonimines. The products of the process are useful in the manufacture of polyurethanes.
Inventors
- 👤 Jeffrey Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:10
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C07; C07D; C07D229/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A PROCESS FOR CONVERTING ISOCYANATE GROUPS IN AN ORGANIC ISOCYANATE SELECTED FROM THE GROUP CONSISTING OF TOLYLENE DIISOCYANATES, DIPHENYLMETHANE DIISOCYANATES AND POLYISOCYANATE COMPOSITIONS COMPRISING DIPHENYLMETHANE DIISOCYANATE IN ADMIXTURE WITH HIGHER ISOCYANATE FUNCTIONALITY, INTO CARBODIIM ISOCYANATES OF HIGHER ISOCYANATE FUNCTIONALITY, INTO CARBODIIMIDE GROUPS BY HEATING THE ORGANIC ISOCYANATE WITH AN ORGANIC PHOSPHOURS CONTAINING CATALYST FOR THE CARBODIIMIDE-FORMING REACTION, SELECTED FROM THE GROUP CONSISTING OF ORGANIC PHOSPHATES OR PHOSPHONATES, PHOSPHORAMIDES, PHOSPHONAMIDES AND TRIARYLAMIDOPHOSPHATES, AND AN ACTIVE HYDROGEN CONTAINING COMPOUND AS CO-CATALYST, SELECTED FROM THE GROUP CONSISTING OF WATER AND ANILINE
Claim 2
Dependent Claim
88 words
A PROCESS FOR CONVERTING ISOCYANATE GROUPS IN AN ORGANIC ISOCYANATE SELECTED FROM THE GROUP CONSISTING OF TOLYLENE DIISOCYANATES, DIPHENYLMETHANE DIISOCYANATES AND POLYISOCYANATE COMPOSITIONS COMPRISING DIPHENYLMETHANE DIISOCYANATE IN ADMIXTURE WITH HIGHER ISOCYANATE FUNCTIONALITY, INTO CARBODIIM ISOCYANATES OF HIGHER ISOCYANATE FUNCTIONALITY, INTO CARBODIIMIDE GROUPS BY HEATING THE ORGANIC ISOCYANATE WITH AN ORGANIC PHOSPHOURS CONTAINING CATALYST FOR THE CARBODIIMIDE-FORMING REACTION, SELECTED FROM THE GROUP CONSISTING OF ORGANIC PHOSPHATES OR PHOSPHONATES, PHOSPHORAMIDES, PHOSPHONAMIDES AND TRIARYLAMIDOPHOSPHATES, AND AN ACTIVE HYDROGEN CONTAINING COMPOUND AS CO-CATALYST, SELECTED FROM THE GROUP CONSISTING OF WATER AND ANILINE
Claim 3
Dependent Claim
15 words
A process as claimed in claim 1 wherein the organic isocyanate is a tolylene diisocyanate.
Claim 4
Dependent Claim
16 words
A process as claimed in claim 1 wherein the organic isocyanate is a refined diphenylmethane diisocyanate.
Claim 5
Dependent Claim
41 words
A PROCESS AS CLAIMED IN CLAIM 1 WHEREIN THE CARBODIMIDE GROUPS ARE ALLOWED TO REACT FURTHER TO CONVERT AT LEAST A PROPORTION OF SUCH GROUPS TO URETONIMINE GROUPS AND THE FINAL PRODUCT CONTAINS FROM 3% TO 10% WEIGHT OF URETONIMINE GROUPS.
Claim 6
Dependent Claim
24 words
A process as claimed in claim 1 wherein the amount of phosphorus containing catalyst is from 0.1% to 10% by weight of the isocyanate.
Claim 7
Dependent Claim
23 words
A process as claimed in claim 1 wherein the amount of co-catalyst used is from 0.05% to 5% by weight of the isocyanate.
Claim 8
Dependent Claim
22 words
A process as claimed in claim 6 wherein the amount of co-catalyst is from 0.05% to 1% by weight of the isocyanate.
Claim 9
Dependent Claim
20 words
A process as claimed in claim 1 wherein heating is carried out at a temperature of from 40*C to 220*C.
Claim 10
Dependent Claim
13 words
A process as claimed in claim 1 wherein the catalyst is a phosphoramide.
Claim 11
Dependent Claim
26 words
A process as claimed in claim 9 wherein the phosphoramide catalyst is rendered inactive after the conversion, by complex formation with an equivalent amount of chloroform.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |