Asahi Kasei Kabushiki Kaisha

Junichi Shishido

Shinya Hamasaki

Kenichi Sanechika

Hitoshi Mizomoto

Hirofumi Miura

[Problems] To provide a novel hydrophilized separation membrane for use in the treatment of a liquid, which comprises an aromatic ether polymer, is less likely to be degraded by sterilization with a high energy ray and has a controlled pore size and a high water permeability. [Means for Solving Problems] A porous separation membrane for use in the treatment of a liquid which is produced by a wet film formation process using an aromatic ether polymer and a hydrophilizing agent. The separation membrane can be used for medical purposes or in a pharmaceutical of food.

Separation membrane for use in treatment of liquid comprising aromatic ether polymer hydrophilized with hydrophilizing agent

A cyclic conjugated diene copolymer comprising a main chain comprised of (A) cyclic conjugated diene monomer units, (B) monomer units obtained from vinyl aromatic monomers each having a hydrogen atom at the &#x3b1;-position thereof, and optionally (C) monomer units obtained from commoners which are other than the monomers used for obtaining the monomer units A and B and which are copolymerizable with at least one of the monomers used for obtaining the monomer units A and B, wherein all monomer units A and the monomer units B together form one or more polymer chains each having an A/B random sequence, wherein the one or more polymer chains each having an A/B random sequence contain at least one polymer chain having a number average molecular weight of from 20,000 to 500,000 and contain no polymer chain having a number average molecular weight of more than 500,000. A process for producing the above-mentioned cyclic conjugated diene copolymer by living anionic polymerization.

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Tokyo, Japan

Junichi Shishido