US 11,939,441 B2
Water-soluble film, manufacturing method, and package
Osamu Kazeto, Kurashiki (JP); and Masahiro Takafuji, Saijo (JP)
Assigned to KURARAY CO., LTD., Okayama (JP)
Appl. No. 18/036,639
Filed by KURARAY CO., LTD., Okayama (JP)
PCT Filed Sep. 30, 2022, PCT No. PCT/JP2022/036859
§ 371(c)(1), (2) Date May 11, 2023,
PCT Pub. No. WO2023/054720, PCT Pub. Date Apr. 6, 2023.
Claims priority of application No. 2021-163139 (JP), filed on Oct. 1, 2021.
Prior Publication US 2023/0323046 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C11D 17/00 (2006.01); C08F 16/06 (2006.01); C08J 5/18 (2006.01); C08K 5/053 (2006.01); C08L 29/04 (2006.01)
CPC C08J 5/18 (2013.01) [C08K 5/053 (2013.01); C08F 16/06 (2013.01); C08J 2300/14 (2013.01); C08J 2329/04 (2013.01); C11D 17/00 (2013.01)] 20 Claims
 
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.