Patent ID: 8722782

Claim:
A polyvinyl alcohol-based resin composition comprising: a water soluble polyvinyl alcohol-based resin which comprises a structural unit represented by formula (1), and has an absorbance of 0.1 to 0.3 of 280 nm in an ultraviolet absorbance spectrum when a 4 mass % aqueous solution thereof is prepared; a carboxylic acid; and at least one of an alkaline metal salt and an alkaline-earth metal salt, wherein, when an aqueous solution of the polyvinyl alcohol-based resin composition is prepared so as to have a content of the polyvinyl alcohol-based resin of 4 mass %, the pH of the aqueous solution at 20° C. is from 5.5 to 7 wherein formula (I) is: in which R 1 , R 2 , and R 3 independently represent a hydrogen atom or an organic group, X represents a single bond or a bonding chain, and R 4 , R 5 , and R 6 independently represent a hydrogen atom or an organic group.