Patent ID: 11939442
Assignee: KURARAY CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | 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 when the water-soluble film is immersed in a 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 in an environment of 23° C. and 50% RH for 24 hours, and then deionized water is added dropwise to a surface of the film, a contact angle at 6 seconds after the dropwise addition is 20° or more,
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, and
a swelling degree of the water-soluble film when the water-soluble film is immersed in the model detergent in an environment of 23° C. and 50% RH for 1 hour is 30 to 50%.