Lithographic printing plate precursor, method of producing same, and printing method using same

Patent metadata

Field	Value
Publication number	US-10759209-B2
Application number	US-201916399088-A
Country	US
Kind code	B2
Filing date	Apr 30, 2019
Priority date	Jan 29, 2015
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

Provided are a lithographic printing plate precursor for furnishing a lithographic printing plate in which adhesion to interleaving paper is prevented, contamination inside a device is prevented, and edge stain does not occur; a method of producing the same; and a printing method using the same. The lithographic printing plate precursor includes: a support; and an image recording layer on the support, in which a region of a surface of the lithographic printing plate precursor at a side of the image recording layer, which is from an end portion of the lithographic printing plate precursor to a portion inside the end portion by 5 mm, contains at least-one polymer selected from polyamide, polyurethane, polyurea, polyester and polycarbonate, and has a content of the polymer per unit area which is greater than a content of the polymer per unit area in a region other than the above-described region by an amount of 10 mg/m 2 or greater.

First claim

What is claimed is:

1. A lithographic printing plate precursor comprising:
a support; and
an image recording layer on the support,
wherein a region of a surface of the lithographic printing plate precursor at a side of the image recording layer, which is from an end portion of the lithographic printing plate precursor to a portion inside the end portion by 5 mm, contains at least one polymer selected from: a polymer having an amide bond of the structure —NRC(═O)— in which R represents a hydrogen atom or a substituent in a main chain or a graft chain and derivatives of the polymer; a polymer having a urethane bond of the structure —NRC(═O)O— in which R represents a hydrogen atom or a substituent in a main chain or a graft chain and derivatives of the polymer; a polymer having a urea bond of the structure —NRC(═O)NR— in which R represents a hydrogen atom or a substituent in a main chain or a graft chain and derivatives of the polymer; a polymer having an ester bond of the structure —C(═O)O— in a main chain or a graft chain and derivatives of the polymer; and a polymer having a carbonate bond of the structure —OCOO— in a main chain or a graft chain and derivatives of the polymer, and has a content of the polymer per unit area which is greater than a content of the polymer per unit area in a region other than the region of a surface of the lithographic printing plate precursor at a side of the image recording layer by an amount of 10 mg/m 2 or greater, and
wherein the end portion of the lithographic printing plate precursor has a shear drop shape.

2. The lithographic printing plate precursor according to claim 1 ,
wherein the end portion of the lithographic printing plate precursor has a shear drop shape in which an amount of the shear drop is in a range of 35 to 150 μm.

3. The lithographic printing plate precursor according to claim 1 ,
wherein the polymer has a weight average molecular weight of from 2,000 to 1,000,000.

4. The lithographic printing plate precursor according to claim 1 ,
wherein the region of a surface of the lithographic printing plate precursor at a side of the image recording layer, which is from an end portion of the lithographic printing plate precursor to a portion inside the end portion by 5 mm, further contains a hydrophilic compound.

5. The lithographic printing plate precursor according to claim 4 ,
wherein the hydrophilic compound is a phosphoric acid compound or a phosphonic acid compound.

6. The lithographic printing plate precursor according to claim 1 ,
wherein the image recording layer contains a borate compound.

7. The lithographic printing plate precursor according to claim 1 ,
wherein the image recording layer contains a polymer compound in the form of fine particles.

8. The lithographic printing plate precursor according to claim 7 ,
wherein the polymer compound in the form of fine particles comprises a copolymer containing styrene and acrylonitrile.

9. The lithographic printing plate precursor according to claim 8 ,
wherein the polymer compound in the form of fine particles is a thermoplastic polymer.

10. A method of producing a lithographic printing plate precursor which includes a support; and an image recording layer on the support, in which a region of a surface of the lithographic printing plate precursor at a side of the image recording layer, which is from an end portion of the lithographic printing plate precursor to a portion inside the end portion by 5 mm, contains at least one polymer selected from: a polymer having an amide bond of the structure —NRC(═O)— in which R represents a hydrogen atom or a substituent in a main chain or a graft chain and derivatives of the polymer; a polymer having a urethane bond of the structure —NRC(═O)O— in which R represents a hydrogen atom or a substituent in a main chain or a graft chain and derivatives of the polymer; a polymer having a urea bond of the structure —NRC(═O)NR— in which R represents a hydrogen atom or a substituent in a main chain or a graft chain and derivatives of the polymer; a polymer having an ester bond of the structure —C(═O)O— in a main chain or a graft chain and derivatives of the polymer; and a polymer having a carbonate bond of the structure —OCOO— in a main chain or a graft chain and derivatives of the polymer, and has a content of the polymer per unit area which is greater than a content of the polymer per unit area in a region other than the region of a surface of the lithographic printing plate precursor at a side of the image recording layer by an amount of 10 mg/m 2 or greater, the method comprising:
cutting the lithographic printing plate precursor; and
after the cutting, coating a part of the image recording layer with a coating solution containing the polymer.

Assignees

• Fujifilm Corp

Inventors

• Wariishi Koji

Classifications

• G03F7/092 Primary

  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

• B41N3/00

  Preparing for use and conserving printing surfaces · CPC title

• G03F7/004

  Photosensitive materials (G03F7/12, G03F7/14 take precedence) · CPC title

• G03F7/00

  Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor (using photoresist structures for special production processes, see the relevant places, e.g. B44C, H10P76/00, H05K) · CPC title

• G03F7/11

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