VINYL ALCOHOL POLYMER AND USE THEREOF

摘要

A vinyl alcohol polymer having an ethylenic double bond and a saponification degree of 70% by mole or more, which is characterized by being soluble in water and is also characterized in that: the molar ratio of the ethylenic double bond to the total of a vinyl alcohol unit and a vinyl acetate unit is from 0.05/100 to 2/100; and the limiting viscosity [η] and the weight average molecular weight Mw of a vinyl ester polymer that is obtained by esterifying the vinyl alcohol polymer satisfy the following formulae (1) and (2). 4.7 ≤ logMw ≤ 6.3 (1) 0.60 < (log[η] + 3.75)/logMw < 0.69 (2)