Patent ID: 11939441
Assignee: KURARAY CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC C

Claim 0:
1. A water-soluble film comprising polyvinyl alcohol having a polymerization degree of 100 to 3,000 and a polyhydric alcohol plasticizer in an amount of 1 to 50 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol,
wherein in a case where the water-soluble film is used for a package in which a model detergent is packaged, the model detergent containing 8.6 mass % of monoethanolamine, 23.8 mass % of dodecylbenzenesulfonic acid, 9.5 mass % of propylene glycol, 23.8 mass % of a lauryl alcohol ethoxylate-7 ethylene oxide adduct, 19.1 mass % of oleic acid, 9.5 mass % of diethylene glycol, and 5.7 mass % of water, a weight reduction rate of the package when the package is stored at 23° C. and 50% RH is 1.0 to 6.0 g/(m2·day) per surface area of the water-soluble film in contact with the model detergent of the package,
when the water-soluble film is immersed in the model detergent in an environment of 23° C. and 50% RH for 24 hours and then a tensile test is performed at 23° C. and 50% RH, an elastic modulus of the water-soluble film when the water-soluble film is stretched to 100% is 9 to 35 MPa, and
when the water-soluble film is immersed in the model detergent in an environment of 23° C. and 50% RH for 24 hours and then the water-soluble film is immersed in deionized water at 5° C., a complete dissolution time is within 100 seconds.