Photosensitive resin composition for flexographic printing

Patent metadata

Field	Value
Publication number	US-12332564-B2
Application number	US-202117923873-A
Country	US
Kind code	B2
Filing date	May 12, 2021
Priority date	May 15, 2020
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A photosensitive resin composition for flexographic printing includes components (A) to (E) below: (A) a first styrene-butadiene-styrene block copolymer (SBS); (B) a second styrene-butadiene-styrene block copolymer (SBS); (C) a polybutadiene or a derivative thereof; (D) a photopolymerizable monomer; and (E) a photopolymerization initiator, and comprises with respect to (A), 5 to 100 wt % of (B), 10 to 40 wt % of (C), 40 to 200 wt % of (D), and 4 to 20 wt % of (E).

First claim

The invention claimed is:

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).

2. The photosensitive resin composition for flexographic printing according to claim 1 , wherein the first styrene-butadiene-styrene block copolymer (SBS) (A) has a weight-average molecular weight (Mw) of 50,000 to 500,000.

3. The photosensitive resin composition for flexographic printing according to claim 1 , wherein the first styrene-butadiene-styrene block copolymer (SBS) (A) has a molecular weight distribution (Mw/Mn) of 1 to 10.

4. The photosensitive resin composition for flexographic printing according to claim 1 , wherein the second styrene-butadiene-styrene block copolymer (SBS) (B) has a weight-average molecular weight (Mw) of 10,000 to 100,000.

5. The photosensitive resin composition for flexographic printing according to claim 1 , wherein the second styrene-butadiene-styrene block copolymer (SBS) (B) has a molecular weight distribution (Mw/Mn) of 1 to 3.

6. The photosensitive resin composition for flexographic printing according to claim 1 , wherein the polybutadiene or a derivative thereof (C) has a weight-average molecular weight (Mw) of 1,000 to 10,000.

7. The photosensitive resin composition for flexographic printing according to claim 1 , wherein the polybutadiene or a derivative thereof (C) has a molecular weight distribution (Mw/Mn) of 1 to 3.

Assignees

• Nippon Soda Co

Inventors

• Osumi Shota

Classifications

• C08F297/04

  polymerising vinyl aromatic monomers and conjugated dienes · CPC title

• C08F287/00

  Macromolecular compounds obtained by polymerising monomers on to block polymers · CPC title

• G03F7/0384

  with ethylenic or acetylenic bands in the main chain of the photopolymer · CPC title

• G03F7/029

  Inorganic compounds; Onium compounds; Organic compounds having hetero atoms other than oxygen, nitrogen or sulfur · CPC title

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title