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US 4,734,462 AGranted
Preparation of block polyurethane-amides
AssigneeEMS-Inventa AG
InventorsHanns-Jorg Liedloff, Hans-Joachim Schultze
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Abstract
A method for the preparation of block polyurethane amides in a melt by the reaction of (a) a linear polyamide having terminal carboxylic acid ester groups and which melts at not more than 210.degree. C.; and (b) a polyurethane having hydroxyl groups at its chain ends; at a temperature of 160.degree. C. to 240.degree. C., and in the presence of a trans-esterification accelerator.
Claims27
A method for the preparation of block polyurethane amides in a melt by the reaction of
- (a) a linear polyamide having terminal carboxylic acid ester groups and which melts at not more than 210.degree. C.;
- and
- (b) a polyurethane having hydroxyl groups at its chain ends;
- at a temperature of 160.degree. C. to 240.degree. C., and in the presence of a trans-esterification accelerator.
1 more element
Dependencies are inferred from the claim text.