Patent ID: 11939452
Assignee: MITSUBISHI CHEMICAL CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 10:
11. A polyvinyl alcohol film comprising:
(A) not less than 50 wt % of a polyvinyl alcohol resin relative to the total weight of the film, the polyvinyl alcohol resin comprising a carboxyl-modified polyvinyl alcohol having a saponification degree of 85 to 99.9 mol %;
(B) as ester of a C2 to C4 fatty acid (b1) and a polyhydric alcohol (b2);
(C) a plasticizer;
(D) 1 to 30 parts by weight relative to 100 parts by weight of the polyvinyl alcohol resin of a filler comprising starch particles having an average particle size D50 of from 15 to 35 μm; and
(E) 0.1 to 3 parts by weight relative to 100 parts by weight of the polyvinyl alcohol resin of a surfactant selected from the group consisting of a polyoxyethylene alkyl allyl ether, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, a polyoxyalkylene alkyl ether phosphate monoethanolamine salt, and a polyoxyethylene alkylamino ether;
wherein the ester (B) is present in an amount of 1 to 1,500 ppm,
wherein the ester (B) and the plasticizer (C) are present in a weight ratio of (B)/(C) of 0.00001 to 0.005,
wherein the plasticizer (C) is a combination of glycerin and one selected from the group consisting of sorbitol, sucrose, and trehalose
wherein the plasticizer (C) is present in an amount of 5 to 70 parts by weight relative to 100 parts by weight of the polyvinyl alcohol resin, and
wherein the polyhydric alcohol (b2) is a C2 to C6 polyhydric alcohol.