US 12,332,564 B2
Photosensitive resin composition for flexographic printing
Shota Osumi, Chiba (JP)
Assigned to NIPPON SODA CO., LTD., Tokyo (JP)
Appl. No. 17/923,873
Filed by NIPPON SODA CO., LTD., Tokyo (JP)
PCT Filed May 12, 2021, PCT No. PCT/JP2021/017988
§ 371(c)(1), (2) Date Nov. 7, 2022,
PCT Pub. No. WO2021/230270, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 2020-085991 (JP), filed on May 15, 2020.
Prior Publication US 2023/0176478 A1, Jun. 8, 2023
Int. Cl. G03F 7/033 (2006.01); C08F 287/00 (2006.01); C08F 297/04 (2006.01); G03F 7/029 (2006.01); G03F 7/038 (2006.01)
CPC G03F 7/033 (2013.01) [G03F 7/029 (2013.01); G03F 7/0384 (2013.01)] 7 Claims
 
1. A photosensitive resin composition for flexographic printing, comprising:
(A) a first styrene-butadiene-styrene block copolymer (SBS),
wherein
a weight ratio of the styrene block to the butadiene block is 10:90 to 80:20, and
a molar ratio of 1,2 bond structures to 1,4 bond structures in the butadiene block is 0:100 to 70:30;
(B) a second styrene-butadiene-styrene block copolymer (SBS),
wherein
a weight ratio of the styrene block to the butadiene block is 10:90 to 80:20, and
a molar ratio of 1,2 bond structures to 1,4 bond structures in the butadiene block is 80:20 to 100:0;
(C) a polybutadiene or a derivative thereof,
wherein
a molar ratio of 1,2 bond structures to 1,4 bond structures is 80:20 to 100:0;
(D) a photopolymerizable monomer; and
(E) a photopolymerization initiator,
comprising 5 to 100 wt % of the second styrene-butadiene-styrene block copolymer (SBS) (B) with respect to the amount of the first styrene-butadiene-styrene block copolymer (SBS) (A),
comprising 10 to 40 wt % of the polybutadiene or a derivative thereof (C) with respect to the amount of the first styrene-butadiene-styrene block copolymer (SBS) (A),
comprising 40 to 200 wt % of the photopolymerizable monomer (D) with respect to the amount of the first styrene-butadiene-styrene block copolymer (SBS) (A), and
comprising 4 to 20 wt % of the photopolymerization initiator (E) with respect to the amount of the first styrene-butadiene-styrene block copolymer (SBS) (A).