POLYOXYALKYLENE-MODIFIED VINYL ALCOHOL POLYMER AND USE THEREOF

摘要

Provided is a polyoxyalkylene modified vinyl alcohol-based polymer comprising a polyoxyalkylene group in a side chain, wherein the polymer has a viscosity average degree of polymerization of not less than 150 and not more than 5000, a degree of saponification of not less than 40 mol% and not more than 99. 99 mol%, and a polyoxyalkylene group modification rate of not less than 0.05 mol% and not more than 10 mol%; and the polyoxyalkylene group is composed of a polyoxypropylene block and a (poly) oxyethylene block and is represented by the following general formula (I). Such polymer is excellent in temperature-sensitive thickening properties.
(in the general formula (I), R 1 denotes a hydrogen atom or an alkyl group having a carbon number of from 1 to 8; either one of R 2 and R 3 is a methyl group and the other is a hydrogen atom; and 10 ‰¤ m ‰¤ 40 and 1 ‰¤ n ‰¤ 50).