申请人:Kuraray Co., Ltd.
公开号:EP2692749A1
公开(公告)日:2014-02-05
Provided are a vinyl acetal polymer that has sufficient plasticity and solubility in an alcohol solvent, imparts low viscosity, stability, etc., to a solution thereof, is less likely to cause phase separation from other components, and allows for formation of a slurry superior in dispersibility of particles and thixotropic nature, as well as a sheet superior in strength and flexibility, and the like. An alkyl-modified vinyl acetal polymer obtained by subjecting an alkyl-modified vinyl alcohol polymer to acetalization, in which the alkyl-modified vinyl alcohol polymer comprises a monomer unit represented by the following general formula (I), and has a viscosity average degree of polymerization P of 150 or greater and 5,000 or less, a degree of saponification of 20 mol% or greater and 99.99 mol% or less, and a percentage of alkyl modification S with the monomer unit of 0.05 mol% or greater and 5 mol% or less.
本发明提供了一种乙烯基缩醛聚合物,该聚合物在醇类溶剂中具有足够的可塑性和溶解性,可使其溶液具有低粘度和稳定性等,不易与其他成分发生相分离,并可形成在颗粒分散性和触变性方面更优越的浆料,以及在强度和柔韧性方面更优越的片材等。一种烷基改性乙烯基缩醛聚合物,通过对烷基改性乙烯基醇聚合物进行缩醛化而获得,其中烷基改性乙烯基醇聚合物包含由下式通式(I)表示的单体单元,其粘度平均聚合度 P 为 150 或以上、5000 或以下,皂化度为 20 摩尔%或以上、99.99 摩尔%或以下,烷基改性 S 与单体单元的百分比为 0.05 摩尔%或以上、5 摩尔%或以下。