Patent US4085140A successfully refreshed from Google Patents.
US4085140A
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US
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Carbodiimides
Assignee: Imperial Chemical Industries Ltd
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Filing: 1977-08-23
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Granted: 1978-04-18
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Expires: 1997-08-23
Abstract
Abstract A process for the conversion of isocyanate groups to carbodiimide groups which comprises contacting the compound containing the isocyanate groups with a cyclic phosphorus compound which catalyses said conversion in the presence of a nitrogeneous base and the use of the products thereof in the manufacture of isocyanate-based polymers.
Inventors
- 👤 Arthur Ibbotson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:29
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C07; C07C; C07C267/00; C08G18/02; C08G18/022; C08G18/025; C08G18/08; C08G18/09; C08G18/092; C08G18/28; C08G18/2805; C08G18/2815; C08G18/282; C08G18/2825; C08G18/30; C08G18/32; C08G18/3203; C08G18/3206; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G18/4241; C08G18/48; C08G18/4804; C08G18/4812; C08G18/4825; C08G18/4829; C08G18/4833; C08G18/4837; C08G18/485; C08G18/50; C08G18/5021; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/7671; C08G2101/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
In a process for the conversion of isocyanate groups to carbodiimide groups which comprises contacting a compound containing isocyanate groups with a cyclic phosphorus compound which catalyses said conversion the improvement which comprises carrying out said conversion in the presence of a nitrogeneous base selected from 1,4-diazobicyclo-[2,2,2]-octane, N,N-dimethylcyclohexylamine, triethylamine, pyrrolizidine and tetramethylguanidine.
Claim 2
Dependent Claim
52 words
In a process for the conversion of isocyanate groups to carbodiimide groups which comprises contacting a compound containing isocyanate groups with a cyclic phosphorus compound which catalyses said conversion the improvement which comprises carrying out said conversion in the presence of a nitrogeneous base selected from 1,4-diazobicyclo-[2,2,2]-octane, N,N-dimethylcyclohexylamine, triethylamine, pyrrolizidine and tetramethylguanidine.
Claim 3
Dependent Claim
15 words
A process as set forth in claim 1 in which said nitrogeneous base is 1,4-diazobicyclo-[2,2,2]-octane.
Claim 4
Dependent Claim
15 words
A process as set forth in claim 1 in which said nitrogeneous base is N,N-dimethylcyclohexylamine.
Claim 5
Dependent Claim
15 words
A process as set forth in claim 1 in which said nitrogeneous base is triethylamine.
Claim 6
Dependent Claim
15 words
A process as set forth in claim 1 in which said nitrogeneous base is pyrrolizidine.
Claim 7
Dependent Claim
15 words
A process as set forth in claim 1 in which said nitrogeneous base is tetramethylguanidine.
References Cited (Backward Citations)
US4014935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |