Patent ID: 8569414

Claim:
A polyvinyl alcohol resin composition comprising (A) a polyvinyl alcohol resin (abbreviated as PVA resin); and (B) a mixture of block copolymers, said block copolymers each containing a block of an aromatic vinyl polymer, and at least one of a block of a conjugated diene polymer and a hydrogenated block of the conjugated diene polymer, wherein the (A) PVA resin contains a structural unit of the following formula (1), and wherein a weight ratio ((A)/(B)) of the contents of the (A) PVA resin to the (B) mixture of block copolymers is in the range of 90/10 to 75/25, and a ratio (η A /η B ) of the melt viscosity η A of the (A) PVA resin to the melt viscosity η B of the (B) mixture of block copolymers is in the range of 1/3 to 3/1, and wherein the (B) mixture of block copolymers includes (B1) a block copolymer having no carboxyl group and (B2) a block copolymer modified with a carboxyl group-containing compound, and a weight ratio ((B1)/(B2)) of the (B1) block copolymer to the (B2) block copolymer is in the range of 70/30 to 30/70: wherein each of R 1 , R 2 and R 3 independently represents a hydrogen or an organic group, X represents a single bond or a linking chain, and each of R 4 , R 5 and R 6 independently represents a hydrogen or an organic group.