US 11,939,452 B2
Polyvinyl alcohol film, and chemical agent package
Shouichi Kani, Tokyo (JP)
Assigned to MITSUBISHI CHEMICAL CORPORATION, Tokyo (JP)
Filed by Mitsubishi Chemical Corporation, Tokyo (JP)
Filed on Jan. 13, 2021, as Appl. No. 17/147,785.
Application 17/147,785 is a continuation of application No. PCT/JP2019/029582, filed on Jul. 29, 2019.
Claims priority of application No. 2018-143771 (JP), filed on Jul. 31, 2018; and application No. 2018-143772 (JP), filed on Jul. 31, 2018.
Prior Publication US 2021/0130576 A1, May 6, 2021
Int. Cl. B65D 75/28 (2006.01); C08K 5/053 (2006.01); C08K 5/103 (2006.01); C08K 5/53 (2006.01); B65D 65/46 (2006.01)
CPC C08K 5/103 (2013.01) [B65D 75/28 (2013.01); C08K 5/053 (2013.01); B65D 65/46 (2013.01)] 12 Claims
 
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.