| abstract |
An object of the present invention is to provide a novel polyvinyl alcohol-based resin excellent in viscosity stability of an aqueous solution, high-speed coatability, reactivity with a crosslinking agent and water solubility. The invention relates to a polyvinyl alcohol-based resin comprising a structural unit having a carboxyl group-containing long-chain alkyl group on a side chain, which is represented by the general formula (1): n [KA 1] n n n n n n n n n n wherein R 1 and R 2 each independently represents a hydrogen atom or an alkyl group, R 4 , R 5 and R 6 each independently represents a hydrogen atom or an alkyl group, R 3 represents a hydrogen atom, an alkyl group or an alkali metal, and n represents a positive integer. |