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

Patent metadata

Field	Value
Publication number	US-10322597-B2
Application number	US-201715661175-A
Country	US
Kind code	B2
Filing date	Jul 27, 2017
Priority date	Jan 29, 2015
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

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/m2 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 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 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.

2. The lithographic printing plate precursor according to claim 1 ,
wherein the polymer comprises at least one group selected from a carboxy group, a sulfo group, a phosphoric acid group, a phosphonic acid group, a sulfuric acid group, an amino group and a polyalkylene oxide group.

3. 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 X of shear drop is in a range of 35 to 150 μm and a width Y of shear drop is in a range of 70 to 300 μm.

4. The lithographic printing plate precursor according to claim 1 ,
wherein the image recording layer contains an infrared absorbing agent, a polymerization initiator, a polymerizable compound and a binder polymer.

5. The lithographic printing plate precursor according to claim 1 ,
wherein the image recording layer contains an infrared absorbing agent, a polymerization initiator, a polymerizable compound and a polymer compound having a fine particle shape.

6. The lithographic printing plate precursor according to claim 1 ,
wherein the image recording layer contains an infrared absorbing agent and a thermoplastic polymer fine particles.

7. 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 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 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:
an image recording layer forming step a of forming the image recording layer;
a coating step b of coating a region of a part of the image recording layer which is formed by the step a with a coating solution containing the polymer so that the coating solution and the region overlap each other; and
a cutting step c of cutting so that the region coated with the coating solution is within the region of a surface of the lithographic printing plate precursor at a side of the image recording layer which is from the end portion of the cut lithographic printing plate precursor to a portion inside the end portion by 5 mm,
wherein the steps are performed in order of the step a, the step b and the step c or in order of the step b, the step a and the step c, on the support.

8. The method of producing a lithographic printing plate precursor according to claim 7 ,
wherein an undercoat layer forming step d of forming an undercoat layer is performed on the support before the step a.

9. The method of producing a lithographic printing plate precursor according to claim 7 ,
wherein a protective layer forming step e of forming a protective layer is performed on the image recording layer after the step a and before the step c.

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 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 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:
an image recording layer forming step a of forming the image recording layer; and
a coating step f of coating a region of a surface of the lithographic printing plate precursor at a side of the image recording layer, which is from the end portion of the lithographic printing plate precursor to a portion inside the end portion by 5 mm, with a coating solution containing the polymer,
wherein the steps are performed in order of the step a and the step f on the support.

11. The method of producing a lithographic printing plate precursor according to claim 10 ,
wherein an undercoat layer forming step d of forming an undercoat layer is performed on the support before the step a.

12. The method of producing a lithographic printing plate precursor according to claim 10 ,
wherein a protective layer forming step e of forming a protective layer is performed on the image recording layer after the step a and before the step f.

13. The method of producing a lithographic printing plate precursor according to claim 7 ,
wherein the polymer comprises at least one group selected from a carboxy group, a sulfo group, a phosphoric acid group, a phosphonic acid group, a sulfuric acid group, an amino group and a polyalkylene oxide group.

14. The method of producing a lithographic printing plate precursor according to claim 10 ,
wherein the polymer comprises at least one group selected from a carboxy group, a sulfo group, a phosphoric acid group, a phosphonic acid group, a sulfuric acid group, an amino group and a polyalkylene oxide group.

15. A lithographic printing plate precursor which is obtained by the production method according to claim 7 .

16. A printing method comprising:
image-exposing the lithographic printing plate precursor according to claim 1 ; and
supplying printing ink and dampening water to remove an unexposed portion of the image recording layer and performing printing on a printing press.

17. The printing method according to claim 16 ,
wherein the printing is performed with printing paper having a width wider than a width of the lithographic printing plate precursor.

Assignees

• Fujifilm Corp

Inventors

• Wariishi Koji

Classifications

• G03F7/11

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

• B41N1/14 Primary

  Lithographic printing foils {(B41N1/003, B41N3/03 take precedence; compositions of the image-forming layer B41C1/10)} · 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

• G03F7/092 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