Method for producing printed matter

Patent metadata

Field	Value
Publication number	US-2019105894-A1
Application number	US-201716094639-A
Country	US
Kind code	A1
Filing date	May 19, 2017
Priority date	May 27, 2016
Publication date	Apr 11, 2019
Grant date	—

Abstract

The present invention aims to provide a method of producing a printed matter that shows suppressed scumming in planography. A method of producing a printed matter, the method including the steps of: allowing a dampening water to adhere to a hydrophilic layer of a planographic printing plate having at least the hydrophilic layer and a heat sensitive layer; allowing an ink to adhere to the heat sensitive layer; and transferring the ink adhering to the heat sensitive layer to an object to be printed; wherein the pH (A) of the ink and the pH (B) of the dampening water are both from 1 to 6.5.

First claim

1 . A method of producing a printed matter, the method comprising the steps of:
allowing a dampening water to adhere to a hydrophilic layer of a planographic printing plate having at least the hydrophilic layer and a heat sensitive layer; allowing an ink to adhere to the heat sensitive layer; and transferring the ink adhering to the heat sensitive layer to an object to be printed;
wherein the pH (A) of the ink and the pH (B) of the dampening water are both from 1 to 6.5.

2 . The method of producing a printed matter according to claim 1 , wherein the pH (A) of the ink and the pH (B) of the dampening water satisfy (A)>(B).

3 . The method of producing a printed matter according to claim 1 , wherein the pH (B) of the dampening water is from 3 to 6.

4 . The method of producing a printed matter according to claim 1 , wherein the pH (A) of the ink is from 3 to 6.

5 . The method of producing a printed matter according to claim 1 , wherein the difference between the pH (A) of the ink and the pH (B) of the dampening water (pH (A)−pH (B)) is from 1 to 2.

6 . The method of producing a printed matter according to claim 1 , wherein the step of transferring the adhering ink to the object to be printed is a step of transferring the adhering ink to the object to be printed, directly or through a blanket.

7 . The method of producing a printed matter according to claim 1 , comprising a step of irradiating the ink transferred to the object to be printed, with an active energy ray.

8 . The method of producing a printed matter according to claim 7 , wherein the active energy ray is an emission line having a wavelength of from 350 to 420 nm emitted from a light emitting diode.

9 . The method of producing a printed matter according to claim 1 , comprising a step of washing the printing plate and/or the blanket with wash water after printing.

10 . The method of producing a printed matter according to claim 9 , wherein the wash water has a pH of from 8 to 13.

11 . The method of producing a printed matter according to claim 1 , wherein the ink comprises a pigment, a resin having an acidic group, or a polyfunctional (meth)acrylate having a hydroxyl group.

12 . The method of producing a printed matter according to claim 11 , wherein the acidic group of the resin having an acidic group has at least one selected from the group consisting of a carboxyl group, a sulfo group, and a phosphate group.

13 . The method of producing a printed matter according to claim 11 , wherein the resin having an acidic group has an acid value of from 30 mg KOH/g to 250 mg KOH/g.

14 . The method of producing a printed matter according to claim 11 , wherein the resin having an acidic group has an ethylenically unsaturated group.

15 . The method of producing a printed matter according to claim 14 , wherein the resin having an acidic group has an iodine value of from 0.5 mol/kg to 3.0 mol/kg.

16 . The method of producing a printed matter according to claim 11 , wherein the polyfunctional (meth)acrylate having a hydroxyl group has a hydroxyl value of from 50 mg KOH/g to 200 mg KOH/g.

17 . The method of producing a printed matter according to claim 11 , wherein the ink comprises a photopolymerization initiator.

18 . The method of producing a printed matter according to claim 1 , wherein the ink comprises a surfactant.

19 . The method of producing a printed matter according to claim 18 , wherein the surfactant has an HLB value of from 8 to 18.

20 . The method of producing a printed matter according to claim 18 , wherein the content of the surfactant in the ink is from 1% by mass to 10% by mass.

Assignees

• Toray Industries

Inventors

• Tsuji Yuichi
• Inoue Takejiro

Classifications

• B41M5/26

  Thermography (B41M5/20, B41M5/24 take precedence); {Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used (B23K takes precedence; thermographic or photothermographic systems using noble metal compounds G03C1/494)} · CPC title

• C09D11/101

  Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing · CPC title

• B41M1/06 Primary

  Lithographic printing · CPC title

• B41M7/0081

  using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams · CPC title

• H01M4/366

  as layered products · CPC title