Lithographic printing plate precursor, method of producing same, lithographic printing plate precursor laminate, and lithographic printing method

Patent metadata

Field	Value
Publication number	US-10919331-B2
Application number	US-202016937776-A
Country	US
Kind code	B2
Filing date	Jul 24, 2020
Priority date	Mar 31, 2017
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

Provided are a lithographic printing plate precursor including: a hydrophilized aluminum support, and a water-soluble or water-dispersible negative type image recording layer provided on the aluminum support, in which an arithmetic average height Sa of a surface of an outermost layer on a side opposite to a side where the image recording layer is provided is in a range of 0.3 μm to 20 μm; a method of producing the lithographic printing plate precursor; a lithographic printing plate precursor laminate formed of the lithographic printing plate precursor; and a lithographic printing method.

First claim

What is claimed is:

1. A lithographic printing plate precursor comprising:
a hydrophilized aluminum support; and
a water-soluble or water-dispersible negative type image recording layer on the aluminum support,
an arithmetic average height Sa of a surface of an outermost layer on a side opposite to a side where the image recording layer is provided being in a range of from 0.3 μm to 20 μm,
the image recording layer comprising an infrared absorbing agent, a polymerization initiator, and a microgel that is a cross-linked polymer particle.

2. The lithographic printing plate precursor according to claim 1 , wherein the microgel is a reactive microgel that has a radical polymerizable group on a surface thereof.

3. The lithographic printing plate precursor according to claim 1 , wherein the microgel is a particle of a polymer compound obtainable by reacting a polyvalent isocyanate compound which is an adduct of a polyhydric phenol compound containing two or more hydroxy groups in a molecule and isophorone diisocyanate with a compound containing an active hydrogen atom.

4. The lithographic printing plate precursor according to claim 1 , wherein the image recording layer further comprises a hydrophilic resin.

5. The lithographic printing plate precursor according to claim 1 , wherein the infrared absorbing agent has a water-soluble group.

6. The lithographic printing plate precursor according to claim 1 , wherein the image recording layer further comprises a surfactant having a polyoxyalkylene group or a hydroxy group.

7. The lithographic printing plate precursor according to claim 1 , wherein a Bekk smoothness of a surface of the outermost layer on a side opposite to a side where the image recording layer is provided is 1000 seconds or less.

8. The lithographic printing plate precursor according to claim 1 , wherein the outermost layer on a side opposite to a side where the image recording layer is provided is a resin layer which contains at least one kind of particles having an average particle diameter of 0.5 μm to 20 μm.

9. The lithographic printing plate precursor according to claim 8 , wherein a film thickness of the resin layer is in a range of 0.6 μm to 2 μm.

10. The lithographic printing plate precursor according to claim 9 , satisfying the following Expression (A):
0.2≤(the film thickness of the resin layer/the average particle diameter of the particles contained in the resin layer)≤0.5.  Expression (A):

11. The lithographic printing plate precursor according to claim 8 , wherein a density of the particles in the resin layer is in a range of 500 pcs/m 2 to 500000 pcs/m 2 .

12. The lithographic printing plate precursor according to claim 1 , wherein an arithmetic average height Sa of a surface of an outermost layer on a side where the image recording layer is provided is smaller than the arithmetic average height Sa of the surface of the outermost layer on the side opposite to the side where the image recording layer is provided.

13. The lithographic printing plate precursor according to claim 1 , satisfying the following Expressions (1) and (2) in a case where a Bekk smoothness of a surface of an outermost layer on a side where the image recording layer is provided is set as a seconds and a Bekk smoothness of the surface of the outermost layer on the side opposite to the side where the image recording layer is provided is set as b seconds:
a≤ 1000  (1)

1/ a+ 1/ b≤ 0.002  (2).

14. The lithographic printing plate precursor according to claim 1 , wherein:
the aluminum support comprises an aluminum plate and an aluminum anodized film disposed on the aluminum plate;
the anodized film is positioned closer to the image recording layer than to the aluminum plate;
the anodized film has micropores extending in a depth direction from the surface of the image recording layer side; and
the average diameter of the micropores in the surface of the anodized film is in a range of from 7 nm to 150 nm.

15. The lithographic printing plate precursor according to claim 14 , wherein the average diameter of the micropores in the surface of the anodized film is in a range of 10 nm to 100 nm.

16. The lithographic printing plate precursor according to claim 14 ,
wherein the micropores are formed of large-diameter pores extending to a position at a depth of 10 nm to 1000 nm from the surface of the anodized film and small-diameter pores communicating with a bottom of the large-diameter pores and extending to a position at a depth of 20 nm to 2000 nm from a communication position,
the average diameter of the large-diameter pores in the surface of the anodized film is in a range of 15 nm to 150 nm, and
the average diameter of the small-diameter pores in the communication position is 13 nm or less.

17. A lithographic printing method, comprising:
image-exposing the lithographic printing plate precursor according to claim 1 ;
supplying at least any of printing ink or dampening water and removing an unexposed portion of the image recording layer on a printing press to prepare a lithographic printing plate; and
performing printing using the obtained lithographic printing plate.

18. A lithographic printing method, comprising:
image-exposing the lithographic printing plate precursor according to claim 1 ;
supplying a developer having a pH of 2 to 14 and removing an unexposed portion to prepare a lithographic printing plate; and
performing printing using the obtained lithographic printing plate.

Assignees

• Fujifilm Corp

Inventors

• Ikeyama yusuke
• Watanabe Shumpei
• Oshima Atsushi
• Shimanaka Shuji

Classifications

• G03F7/027

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

• B41C1/1016 Primary

  characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers · CPC title

• G03F7/004

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

• G03F7/09

  characterised by structural details, e.g. supports, auxiliary layers (supports for printing plates in general B41N) · CPC title

• G03F7/033

  the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers · CPC title