Resin printing plate precursor for laser engraving

Patent metadata

Field	Value
Publication number	US-9499002-B2
Application number	US-201414765270-A
Country	US
Kind code	B2
Filing date	Jan 20, 2014
Priority date	Feb 20, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

It is an object of the present invention to provide a resin printing plate precursor for laser engraving that is able to form a relief by laser engraving, the relief having excellent image reproducibility, and moreover has toughness and improved printing durability. The present invention is a resin printing plate precursor for laser engraving comprising a substrate and a resin layer on the substrate, the resin layer containing:
(A) a modified partially saponified polyvinyl acetate having reactive groups in its side chain; (B) a polyamide having basic nitrogen; (C) a compound having a 5- to 7-membered ring and a polymerizable ethylenic double bond; and (D) a photopolymerization initiator.

First claim

The invention claimed is:

1. A method of manufacturing a printing plate, comprising the steps of:
cross-linking a resin printing plate precursor for laser engraving to provide a cross-linked resin printing plate precursor for laser engraving, said resin printing plate precursor for laser engraving comprising:
a substrate and a resin layer on the substrate, the resin layer containing:
(A) a modified partially saponified polyvinyl acetate having reactive groups in its side chain;
(B) a polyamide having basic nitrogen;
(C) a compound having a 5- to 7-membered ring and a polymerizable ethylenic double bond; and
(D) a photopolymerization initiator; and

applying patterned laser radiation to the cross-linked plate precursor to engrave a relief on the resin layer.

2. The method of manufacturing a printing plate according to claim 1 , wherein the compound (C) has a molecular weight of 300 or less.

3. The method of manufacturing a printing plate according to claim 1 , wherein the compound (C) has at least one functional group selected from hydroxyl, carboxyl, and amino.

4. The method of manufacturing a printing plate according to claim 1 , wherein the 5- to 7-membered ring in the compound (C) comprises a heterocyclic ring.

5. The method of manufacturing a printing plate according to claim 4 , wherein the 5- to 7-membered ring in the compound (C) comprises a heterocyclic aliphatic ring.

6. The method of manufacturing a printing plate according to claim 1 , wherein the compound (A) comprises a modified partially saponified polyvinyl acetate having a structure in which carboxyl groups are introduced into a polymer side chain by reacting a partially saponifie polyvinyl acetate with an acid anhydride, and reactive groups are introduced by reacting the carboxyl groups with an unsaturated epoxy compound.

7. The method of manufacturing a printing plate according to claim 1 , wherein the compound (A) has a structure in which an unsaturated epoxy compound is added to an anionically modified polyvinyl alcohol having a degree of saponification of 60 to 90 mol % obtained by saponifying a copolymer of vinyl acetate with an unsaturated carboxylic acid or sail thereof, or with an unsaturated carboxylic ester.

8. The method of manufacturing a printing plate according to claim 1 , wherein the compound (A) has a structure formed by a reaction of a partially saponified polyvinyl acetate with an acrylic compound having an N-methylol group.

9. The method of manufacturing a printing plate according to claim 1 , wherein the compound (B) comprises a piperazine ring.

10. The method of manufacturing a printing plate according to claim 1 , further comprising rinsing the relief with water or a liquid containing water after applying patterned laser radiation.

Assignees

• Toray Industries

Inventors

• Kawahara Hiroyuki
• Abura Tsutomu

Classifications

• B41N1/12 Primary

  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

• G03F7/037

  the binders being polyamides or polyimides · CPC title

• B29B13/00

  Conditioning or physical treatment of the material to be shaped (chemical aspects C08J3/00 {; heating, cooling or curing during shaping B29C35/00; thermal after-treatment B29C71/02}) · CPC title

• B29L2031/767

  Printing equipment or accessories therefor · CPC title

• B29C35/0805

  using electromagnetic radiation · CPC title