Water-developable photosensitive resin composition for flexographic printing and photosensitive resin original plate for flexographic printing obtained therefrom

Patent metadata

Field	Value
Publication number	US-11656551-B2
Application number	US-201816644343-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Sep 5, 2017
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

A photosensitive resin composition for a flexographic printing original plate is disclosed which exhibits reduced adhesion of dust, dirt, and paper powder, resistance to UV ink and allows storage of the printing original plate for a long period of time. A water-developable photosensitive resin composition for flexographic printing, contains at least a polyamide and/or a polyamide block copolymer (a), a cross-linking agent having one or more unsaturated group(s) (b), a photo-polymerization initiator (c), and a fatty acid ester (d), wherein the fatty acid ester (d) has two or more hydroxyl groups and 24 or 25 carbon atoms in a molecule, wherein the fatty acid ester (d) is a fatty acid ester of a compound selected from fatty acids having a number of carbon atoms of 12 to 22, and wherein a content of the fatty acid ester (d) in the photosensitive resin composition is 0.2 to 6% by weight.

First claim

The invention claimed is:

1. A water-developable photosensitive resin composition for flexographic printing, comprising at least a polyamide and/or a polyamide block copolymer (a), a cross-linking agent having one or more unsaturated group(s) (b), a photo-polymerization initiator (c), and a fatty acid ester (d),
wherein the fatty acid ester (d) has two or more hydroxyl groups and 24 or 25 carbon atoms in a molecule, wherein the fatty acid ester (d) is a fatty acid ester of a compound selected from fatty acids having a number of carbon atoms of 12 to 22, and wherein a content of the fatty acid ester (d) in the photosensitive resin composition is 0.2 to 6% by weight, and
wherein the water-developable photosensitive resin composition does not contain rubber component.

2. The water-developable photosensitive resin composition for flexographic printing according to claim 1 , wherein the photosensitive resin composition contains 40 to 60% by weight of the polyamide and/or the polyamide block copolymer (a), 20 to 50% by weight of the cross-linking agent having one or more unsaturated group(s) (b), and 0.1 to 10% by weight of the photo-polymerization initiator (c), and wherein the polyamide and/or the polyamide block copolymer (a) contain(s), in a molecule, 50% by weight or more of a structural unit constituted from an amide bond in a block form.

3. The water-developable photosensitive resin composition for flexographic printing according to claim 1 , wherein the fatty acid ester (d) is sorbitan monooleate, sorbitan monostearate or glycerol monobehenate.

4. A photosensitive resin original plate for flexographic printing, comprising a photosensitive resin layer constituted from the water-developable photosensitive resin composition for flexographic printing according to claim 1 , a support and an adhesive layer for adhering them.

5. The photosensitive resin original plate for flexographic printing according to claim 4 , in combination with a UV ink or a UV varnish.

6. The water-developable photosensitive resin composition for flexographic printing according to claim 1 , wherein the content of the fatty acid ester (d) in the photosensitive resin composition is 4 to 6% by weight.

Assignees

• Toyo Boseki

Inventors

• Kawashima Wataru
• Hasuike Jun

Classifications

• G03F7/11

  having cover layers or intermediate layers, e.g. subbing layers {(G03F7/091 - G03F7/093, B41N3/03 take precedence)} · CPC title

• G03F7/037 Primary

  the binders being polyamides or polyimides · CPC title

• C08G69/14

  Lactams · CPC title

• B41N1/12

  non-metallic other than stone {, e.g. printing plates or foils comprising inorganic materials in an organic matrix (B41N1/003, B41N1/006 take precedence)} · CPC title