VINYL ALCOHOL POLYMER, THICKENER, STABILIZER FOR EMULSION POLYMERIZATION, STABILIZER FOR SUSPENSION POLYMERIZATION, COATING AGENT, COATING, SIZING AGENT FOR FIBERS, AND METHOD FOR PRODUCING SIZED YARN AND TEXTILE

摘要

The purpose of the present invention is to provide PVA having suitable water solubility, highly balanced thickening property and film strength, and excellent storage stability of viscosity in aqueous solution. The present invention is a vinyl alcohol polymer (A) having a ratio (Mw (A)/Mn (A)) of the weight-average molecular weight (Mw (A)) to the number-average molecular weight (Mn (A)) of from 3 to 8, wherein the ratio (Mw (B)/Mn (B)) of the weight-average molecular weight (Mw (B)) to the number-average molecular weight (Mn (B)) of a vinyl alcohol polymer (B) obtained by treating the vinyl alcohol polymer (A) for one hour at 40°C in sodium hydroxide solution is from 2 to less than 3.