Flexographic printing raw plate and manufacturing method of flexographic printing plate

Patent metadata

Field	Value
Publication number	US-12099302-B2
Application number	US-201917299002-A
Country	US
Kind code	B2
Filing date	Dec 9, 2019
Priority date	Dec 10, 2018
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A flexographic printing raw plate comprising at least a support, a photosensitive resin composition layer, an intermediate layer, and an infrared ablation layer sequentially stacked, whereinthe intermediate layer comprises a hydrophilic resin (A) and a layered inorganic compound (B), andthe intermediate layer has a film thickness of 2 μm or more and 30 μm or less.

First claim

The invention claimed is:

1. A flexographic printing raw plate comprising at least a support, a photosensitive resin composition layer, an intermediate layer, and an infrared ablation layer sequentially stacked, wherein
the intermediate layer comprises a hydrophilic resin (A), a layered inorganic compound (B), and a water-dispersible latex (C), and
the intermediate layer has a film thickness of 2 μm or more and 30 μm or less.

2. The flexographic printing raw plate according to claim 1 , wherein
the intermediate layer comprises 5 to 45 parts by mass of the water-dispersible latex (C) per 100 parts by mass of the hydrophilic resin (A).

3. The flexographic printing raw plate according to claim 1 , wherein
the layered inorganic compound (B) contains a clay mineral,
wherein the hydrophilic resin (A) includes a functional group enabling formation of a covalent bond and/or an ion bond with the clay mineral.

4. The flexographic printing raw plate according to claim 1 , wherein
the intermediate layer comprises 0.1 to 20 parts by mass of the layered inorganic compound (B) per 100 parts by mass of the hydrophilic resin (A).

5. The flexographic printing raw plate according to claim 1 , wherein
the layered inorganic compound (B) is water-swellable synthetic mica.

6. The flexographic printing raw plate according to claim 1 , wherein
a gel fraction of the intermediate layer is 10% or more and 90% or less, the gel fraction being calculated according to the following equation:
gel fraction (%)=(mass of intermediate layer having been immersed in pure water at room temperature for 72 hours followed by drying at 50° C. for three hours/mass of intermediate layer before being immersed in pure water)×100.

7. A manufacturing method of a flexographic printing plate, comprising:
producing a negative pattern by subjecting the infrared ablation layer of the flexographic printing raw plate according to claim 1 to laser ablation;
selectively exposing the photosensitive resin composition layer through the negative pattern; and
removing an unexposed part of the photosensitive resin composition layer.

Assignees

• Asahi Chemical Ind

Inventors

• Fujiki Yuzo
• Ogawa Hiroshi
• Saito Hideo

Classifications

• B41N1/006

  made entirely of inorganic materials other than natural stone or metals, e.g. ceramics, carbide materials, ferroelectric materials · CPC title

• B41C1/05

  Heat-generating engraving heads, e.g. laser beam, electron beam · CPC title

• G03F7/092

  characterised by backside coating or layers, by lubricating-slip layers or means, by oxygen barrier layers or by stripping-release layers or means · CPC title

• G03F7/027

  Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds (G03F7/075 takes precedence) · CPC title

• G03F7/202

  Masking pattern being obtained by thermal means, e.g. laser ablation · CPC title