PURPOSE: To permeate gases and alcohols selectively at high speed and heighten the mechanical strength by using a permselective membrane made of copolymers of silicon and polycarbonic acid ester and having specified properties.
CONSTITUTION: A polycarbonic acid ester having a formula I (R stands for H, F, C1-10 alkyl or perfluoroalkyl, n is an integer) and dimethylsiloxane are copolymerized each other. The average molecular weight of the polycarbonic acid ester in the copolymer is set to be 2500-25000 and the content of the dimethylsiloxane in the copolymer is set to be 25-75wt.%. A permselective membrane prepared in this way permeates gases and/or alcohols selectively at high speed and has high mechanical strength and is able to be used as a thin film article.
UCHIDA MAKOTO
HIRATA TAKAYUKI
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