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US 4,963,640 AGranted
Process and compositions for production of moldings
AssigneeMobay Corporation
InventorJohn E. Dewhurst
Life of this patent
Estimating the term…
Abstract
The present invention relates to a novel chain extender for use in making moldings. The chain extender broadly comprises the reaction product of an aromatic diamine and a cyclic carboxylic acid dianhydride.
Claims7
A process for the production of moldings comprising reacting an organic polyisocyanate, an organic active hydrogen containing material having a molecular weight of from 1000 to 8000 and containing at least two active hydrogen groups, and a chain extender in a closed mold, said chain extender comprising the reaction product of
- (a) an aromatic diamine which contains at least one non-reactive substituent in the ortho position to a first amino group and at least one other non-reactive substituent in the ortho position to a second amino group, and
- (b) a cyclic carboxylic acid dianhydride at a molar ratio of component (a) to component (b) of from 3:1 to 25:1.
An isocyanate-reactive mixture comprising
- (i) an organic active hydrogen containing material having a molecular weight of from 1000 to 8000 and containing at least two active hydrogen groups, and
- (ii) the reaction product of
- (a) an aromatic diamine which contains at least one non-reactive substituent in the ortho position to a first amino group and at least one other non-reactive substituent in the ortho position to a second amino group, and
- (b) a cyclic carboxylic acid dianhydride at a molar ratio of component (a) to component (b) of from 3:1 to 5:1.
1 more element
Dependencies are inferred from the claim text.