	US 12,359,076 B2
	Water-soluble resin for printing
Ryo Shibutani, Wakayama (JP); Gota Katayanagi, Wakayama (JP); Tadanori Yoshimura, Wakayama (JP); Akihiro Onoue, Wakayama (JP); Takahiro Noro, Wakayama (JP); and Keiji Sasaki, Wakayama (JP)
Assigned to KAO CORPORATION, Tokyo (JP)
Appl. No. 17/605,610
Filed by KAO CORPORATION, Tokyo (JP)
PCT Filed Apr. 24, 2020, PCT No. PCT/JP2020/017691 § 371(c)(1), (2) Date Oct. 22, 2021, PCT Pub. No. WO2020/218509, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-085036 (JP), filed on Apr. 26, 2019; and application No. 2019-119695 (JP), filed on Jun. 27, 2019.
Prior Publication US 2022/0315778 A1, Oct. 6, 2022
Int. Cl. C09D 11/00 (2014.01); C09D 11/102 (2014.01); C09D 181/08 (2006.01)

CPC C09D 11/102 (2013.01) [C09D 181/08 (2013.01)]

18 Claims

1. A method for removing a printing layer, the method comprising:

treating a printed matter comprising a water-soluble printing layer with neutral water at 30° C. or more to remove the water-soluble printing layer,

wherein the water-soluble printing layer comprises a water-soluble resin for printing comprising:

a monomer unit A having a sulfonate group; and

a monomer unit B derived from a monomer having no hydrophilic groups other than groups that constitute polymerization in producing the water-soluble resin,

wherein a percentage of the monomer unit A based on a total of all monomer units is 5 to 35 mol %.