Process for producing polyether-polyester block copolymer
AssigneeRhodia (China) Co., Ltd.
InventorsZhaoqing Liu, Daobing Lin, Qiaobo Li
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Abstract
The present invention discloses a process for producing a polyether-polyester block copolymer with a di(C 1-C 4)alkyl ester of aromatic dicarboxylic acid, an aliphatic diol or aliphatic polyol and a polyether having at least one terminal hydroxyl group in an inert solvent. In the present invention, the inert solvent 5 is used to prevent the di(C 1-C 4)alkyl ester of aromatic dicarboxylic acid from sublimation instead of excessive polyol, such that the subsequent removal of excessive polyol under high temperature and high vacuum is avoided.
Claims25
A process for producing a polyether-polyester block copolymer, comprising:
- (a) transesterification reaction of at least one di(C1-C4)alkyl ester of aromatic dicarboxylic acid and at least one aliphatic diol or aliphatic polyol in an inert solvent, wherein the inert solvent has a boiling point higher than the boiling point of the alcohol by-product of the transesterification reaction;
- and
- (b) polycondensation reaction of the product of step (a) and at least one polyether, wherein the polyether has at least one terminal hydroxyl group.
Dependencies are inferred from the claim text.