Patent ID: 8772400

Claim:
A polyvinyl alcohol-based film comprising a polyvinyl alcohol-based resin, the polyvinyl alcohol-based resin comprising: a polyvinyl alcohol-based resin (A) containing a 1,2-glycol bond at a side chain; and a polyvinyl alcohol-based resin (B) other than the polyvinyl alcohol-based resin (A), having a degree of saponification of 98% by mol or more, wherein a difference in a degree of saponification between the polyvinyl alcohol-based resin (A) and the polyvinyl alcohol-based resin (B) is in a range of 3% by mol or less, a content of the polyvinyl alcohol-based resin (A) is 5 to 30% by weight relative to a total amount of the polyvinyl alcohol-based resin (A) and the polyvinyl alcohol-based resin (B), and the polyvinyl alcohol-based resin satisfies the following expression (1): 0.01 ≦A×G /( A+B )≦6 (1), wherein A represents the content (weight %) of the polyvinyl alcohol-based resin (A) relative to the total amount of the polyvinyl alcohol-based resin (A) and the polyvinyl alcohol-based resin (B), B represents a content (weight %) of the polyvinyl alcohol-based resin (B) relative to the total amount of the polyvinyl alcohol-based resin (A) and the polyvinyl alcohol-based resin (B), and G represents an amount (mol %) of the 1,2-glycol bond at a side chain.