METHOD FOR PRODUCING POLYESTER-ADDED POLYVINYL ALCOHOL/ VINYL ACETATE COPOLYMER

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a polyester-modified polyvinyl alcohol/vinyl acetate copolymer capable of forming a coating layer endowed with both hydrophilicity and water resistance. SOLUTION: A polyvinyl alcohol/vinyl acetate copolymer having a content vinyl alcohol units of 20-80 mol% is made an addition reaction with a carboxyl- terminated polyester to form bonds between the hydroxyl groups of the former and he carboxyl group of the latter.