NOVEL VINYL ALCOHOL BASED COPOLYMER, PRODUCTION METHOD FOR SAME, AND ION EXCHANGE MEMBRANE
申请人:Kuraray Co., Ltd.
公开号:EP3040350A1
公开(公告)日:2016-07-06
Provided are a modified vinyl alcohol (VA) having a reduced water content to exhibit a practically-required form stability, a producing method for the same, and an ion exchange membrane. (1) A copolymer (P) including, as structural units, a vinyl alcohol monomer unit (A), a vinylene monomer unit (B), and a polymer unit (C) having a polar group other than a hydroxyl group. (2) A method for producing the copolymer (P) including: providing a copolymer (P') including a vinyl alcohol polymer unit (A') and a polymer unit (C) having a polar group other than a hydroxyl group, and heat-treating the copolymer (P') under an acidic condition to form a polyene structure by dehydration so as to introduce a vinylene monomer unit (B). (3) An ion-exchange membrane containing as a main component a copolymer (PA) in which the polymer unit (C) having a polar group other than a hydroxyl group is a polymer unit (CA) having an ionic group.
本发明提供了一种改性乙烯醇(VA),其含水量降低,从而具有实际所需的形态稳定性,还提供了其生产方法和一种离子交换膜。(1) 共聚物 (P),包括作为结构单元的乙烯醇单体单元 (A)、乙烯单体单元 (B) 和具有羟基以外的极性基团的聚合物单元 (C)。(2) 生产共聚物(P)的方法,包括:提供包括乙烯醇聚合物单元(A')和具有羟基以外的极性基团的聚合物单元(C)的共聚物(P'),在酸性条件下对共聚物(P')进行热处理,通过脱水形成聚烯结构,从而引入乙烯单体单元(B)。(3) 一种离子交换膜,其主要成分是共聚物 (PA),其中具有羟基以外的极性基团的聚合物单元 (C) 是具有离子基团的聚合物单元 (CA)。