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), R1 denotes a hydrogen atom or an alkyl group having a carbon number of from 1 to 8; either one of R2 and R3 is a methyl group and the other is a hydrogen atom; and 10 ≤ m ≤ 40 and 1 ≤ n ≤ 50).
本发明提供了一种聚氧亚烷基改性的
乙烯醇基聚合物,其侧链中包含聚氧亚烷基,其中聚合物的粘度平均聚合度不小于 150 且不大于 5000,皂化度不小于 40 mol% 且不大于 99.99摩尔%,聚氧亚烷基改性率不小于0.05摩尔%,不大于10摩尔%;聚氧亚烷基由聚氧
丙烯嵌段和(聚)氧
乙烯嵌段组成,并由以下通式(I)表示。这种聚合物具有优异的温敏增稠性能。
(在通式(I)中,R1 表示氢原子或碳原子数为 1 至 8 的烷基;R2 和 R3 中的一个为甲基,另一个为氢原子;10≤m≤40,1≤n≤50)。