	US 12,173,105 B2
	A-B block copolymer, polymer emulsion and water-based inkjet ink
Hiroyuki Shimanaka, Tokyo (JP); Jun Kamabayashi, Tokyo (JP); Akifumi Tanaka, Tokyo (JP); Toshie Okubo, Tokyo (JP); Lu Tian, Tokyo (JP); Yoshikazu Murakami, Tokyo (JP); and Sachio Yoshikawa, Tokyo (JP)
Assigned to DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD., Tokyo (JP)
Appl. No. 18/006,785
Filed by DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD., Tokyo (JP)
PCT Filed Aug. 12, 2021, PCT No. PCT/JP2021/029730 § 371(c)(1), (2) Date Jan. 25, 2023, PCT Pub. No. WO2022/044825, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 2020-141665 (JP), filed on Aug. 25, 2020.
Prior Publication US 2023/0348651 A1, Nov. 2, 2023
Int. Cl. B41J 2/01 (2006.01); B41M 5/00 (2006.01); C08F 2/24 (2006.01); C08F 293/00 (2006.01); C09D 11/32 (2014.01); C09D 11/326 (2014.01)

CPC C08F 293/00 (2013.01) [B41M 5/0064 (2013.01); C08F 2/24 (2013.01); C09D 11/326 (2013.01)]

9 Claims

1. An A-B block copolymer having a chain A and a chain B and satisfying the following requirements (1-1) to (1-3):

(1-1) comprising 90% by mass or more of a constituent unit derived from at least one selected from the group consisting of methacrylic acid and a methacrylate-based monomer,

having a number average molecular weight of 20,000 to 60,000, and

having a molecular weight distribution (weight average molecular weight/number average molecular weight) of 1.8 or less;

(1-2) the chain A has a constituent unit (A-i) derived from at least one selected from a monomer group (i) consisting of methyl methacrylate, benzyl methacrylate, cyclohexyl methacrylate, and t-butylcyclohexyl methacrylate, and a constituent unit (A-ii) derived from at least one selected from a monomer group (ii) consisting of 2-ethylhexyl methacrylate, lauryl methacrylate, tridecyl methacrylate, stearyl methacrylate, and behenyl methacrylate,

a total content of the constituent unit (A-i) and the constituent unit (A-ii) is 80% by mass or more and a content of the constituent unit (A-ii) is 20 to 80% by mass in the chain A, and

the chain A has a glass transition temperature of 30° C. or lower,

has a number average molecular weight of 15,000 to 50,000, and

has a molecular weight distribution (weight average molecular weight/number average molecular weight) of 1.6 or less; and

(1-3) the chain B has a constituent unit (B) derived from methacrylic acid, a constituent unit (B-i) derived from at least one selected from the monomer group (i) consisting of methyl methacrylate, benzyl methacrylate, cyclohexyl methacrylate, and t-butylcyclohexyl methacrylate, and a constituent unit (B-ii) derived from at least one selected from the monomer group (ii) consisting of 2-ethylhexyl methacrylate, lauryl methacrylate, tridecyl methacrylate, stearyl methacrylate, and behenyl methacrylate,

a total content of the constituent unit (B-i) and the constituent unit (B-ii) in the chain (B) is 80% by mass or more based on a total content of the constituent units other than the constituent unit (B), and

the chain B has an acid value of 50 to 250 mgKOH/g, and

has a number average molecular weight of 1,000 to 10,000.