EP0032011A1
Expired / Lapsed
EP
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Modified isocyanate compositions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1980-12-12
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Granted: —
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Expires: 2000-12-12
Abstract
Abstract A process for the production of a modified isocyanate by reacting a composition containing carbodiimide groups and free isocyanate groups with a diester of an aliphatic dicarboxylic acid in the presence of oxalic or formic acid. The process permits the production of liquid forms of diphenylmethane diisocyanate useful in the manufacture of polyurethanes.
Inventors
- 👤 Jeffrey Hughes
- 👤 Gerard John Murray
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 18:33
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
A process for the production of a modified isocyanate which comprises reacting a composition containing carbodiimide groups and free isocyanate groups with a diester of an aliphatic dicarboxylic acid in the presence of oxalic or formic acid.
Claim 2
Dependent Claim
37 words
A process for the production of a modified isocyanate which comprises reacting a composition containing carbodiimide groups and free isocyanate groups with a diester of an aliphatic dicarboxylic acid in the presence of oxalic or formic acid.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein the diester is a diester of oxalic acid.
Claim 4
Dependent Claim
39 words
A process according to claim 1 or claim 2 wherein the composition containing carbodiimide groups and free isocyanate groups is a composition obtained by converting a proportion of the isocyanate groups in a refined diphenylmethane diisocyanate to carbodiimide groups.
Claim 5
Dependent Claim
52 words
A process according to any one of the preceding claims wherein the diester is used in an amount of from 0.1 to 2.0 moles per gram equivalent of carbodiimide functionality and the oxalic or formic acid is used in an amount of from 0.3 to 1.5 gram equivalents per mole of diester.
Claim 6
Dependent Claim
26 words
A process according to claim 4 wherein the diester is used in an amount of from 0.2 to 1.5 moles per gram equivalent of carbodiimide functionality.
Claim 7
Dependent Claim
31 words
A process according to claim 4 or claim 5 wherein the oxalic or formic acid is used in an amount of from 0.8 to 1.2 gram equivalents per mole of diester.
Claim 8
Dependent Claim
23 words
The use in the manufacture of polyurethanes of a modified isocyanate produced by a process according to any one of the preceding claims.
Claim 9
Dependent Claim
28 words
A composition of matter containing structural units of the formula: wherein R is an optionally substituted alkyl or aryl radical and n is zero or a whole number.
Claim 10
Dependent Claim
28 words
A composition of matter containing structural units of the formula: wherein R is an optionally substituted alkyl or aryl radical and n is zero or a whole number.
References Cited (Backward Citations)
GB1476088A
Cited
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