Polyesters which can be prepared by reacting a carbonic acid aryl ester with a polyester prepared from a polyhydric alcohol and a polybasic carboxylic acid which is aliphatic

摘要

Polyesters containing carbonate groups and consisting of repeating structural units corresponding to the general formula ##STR1## in which X is the residue of a reaction product of a polyhydric alcohol with a polybasic aliphatic carboxylic acid having a molecular weight of from 800 to 3500,PPX' has the same meaning as X or represents the residue of an aliphatic polyether having a molecular weight of from 800 to 3500,PPn=0 or 1 to 10 andP Pm=is a number 20,PPthe intrinsic viscosity in tetrahydrofuran being from 0.8 to 2.5 dl/g.