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

Claim 0:
1. 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) an ester of a C2 to C4 fatty acid (b1) and a polyhydric alcohol (b2); and
(C) a plasticizer;
wherein the ester (B) is present in an amount of 1 to 4,000 ppm,
wherein the ester (B) and the plasticizer (C) are present in a weight ratio (B)/(C) of 0.00001 to 0.005,
wherein the plasticizer (C) is at least one selected from the group consisting of salicyl alcohol, catechol, resorcinol, hydroquinone, bisphenol-A, bisphenol-F, neopentyl glycol, phloroglucinol, erythritol, threitol, pentaerythritol, xylitol, arabitol, fucitol, glucose, fructose, mannitol, sorbitol, inositol, lactitol, sucrose, trehalose, maltitol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, tetraethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, tripropylene glycol, polyethylene glycols having a molecular weight of not greater than 2,000, glycerin, diglycerin, triethanolamine, trimethylolpropane, diethylene glycol monomethyl ether, cyclohexanol, carbitol, polypropylene glycol, dibutyl ether, stearic acid, oleic acid, linoleic acid, linolenic acid, sorbic acid, citric acid, adipic acid, cyclohexanone, monoethanolamine, triethanolamine, ethylenediamine, imidazole compounds, alanine, glycine, aspartic acid, glutamic acid, histidine, lysine, and cysteine,
wherein the polyhydric alcohol (b2) is a C2 to C6 polyhydric alcohol, and
wherein the film exhibits a dissolution time of 120 seconds or less in water at a temperature of 5° C.