Process for making an ester containing polyether sulfone

Details Process for making an ester containing polyether sulfone Process for making an ester containing polyether sulfone

C - Chemistry, Metallurgy

08

G

C08G 75/23 (2006.01) C08G 63/688 (2006.01) C08G 65/48 (2006.01) C08G 75/20 (2006.01)

Patent

CA 2113503

A PROCESS FOR MAKING AN ESTER CONTAINING POLYETHER SULFONE ABSTRACT OF THE DISCLOSURE A two step process for the preparation of an ester group-containing polyether sulfone is disclosed. In the first step a dihalogenodiphenyl sulfone is reacted with excess amount of an aromatic dihydroxy compound and in a second step the reaction product is reacted with a dicarboxylic acid derivative. The excess amount of the aromatic dihydroxy compound is that amount which is sufficient to react with said derivative to form the corresponding ester. The process of the invention is characterized by its economics and good yield and by the high purity of the product. The thus produced polyether sulfone is useful as a thermoplastic resin and as a reactant in the melt blending process for the preparation of block copolymers.

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