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Printing plate material

A printing plate and particle technology, applied in printing, printing plate, printing plate preparation, etc., can solve problems such as pollution, wet water or ink pollution, and reduced sensitivity, and achieve good stability in the bright room, good printing effect, and easy operation sex good effect

Inactive Publication Date: 2009-05-06
KONICA MINOLTA MEDICAL & GRAPHICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] When the content ratio of color material (pigment) particles in the protective coating is increased, the oxygen barrier property of the protective coating is reduced, resulting in the possibility of a decrease in sensitivity
Furthermore, when the content ratio of the color material (pigment) particles is not increased, and the thickness of the protective coating is increased, the light absorption ability is improved, and the printing effect is correspondingly poor (slow ink resistance), which is caused by the peeling residue of the protective coating. Significant concerns about ink roller-water roller contamination in printing presses
Furthermore, since the color material (pigment) particles are colored yellow, the light absorption ability is improved, that is, as the amount of the color material (pigment) particles is increased, there is a concern that the contamination of wet water or ink is obvious.
[0016] In this way, in the on-press development CTP of the polymerization method, no technology with good light room operability has been found.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0171] In order to prevent unnecessary polymerization of the polymerizable ethylenically unsaturated monomer during the preparation or storage of the printing plate material, the image forming layer of the present invention may contain a polymerization inhibitor in addition to the above components. Examples of suitable polymerization inhibitors include hydroquinone, p-methoxyphenol, di-tert-butyl-p-cresol, pyrogallol, tert-butylcatechol, benzoquinone, 4,4'-thio Bis(3-methyl-6-tert-butylphenol), 2,2'-methylenebis(4-methyl-6-tert-butylphenol), N-nitrosophenylhydroxylamine cerous salt , 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzyl)-4-methylphenylacrylate, etc.

[0172] The addition amount of the polymerization inhibitor is preferably about 0.01 mass % to about 5 mass % with respect to the mass of the image forming layer. Furthermore, as needed, in order to prevent oxygen from hindering polymerization, it is possible to add a higher fatty acid such as behenic acid or a h...

Embodiment

[0217] Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited thereto. In addition, the "part" in an Example means a "mass part" unless otherwise indicated.

[0218] (production of support body)

[0219] The support was prepared as follows.

[0220] [support body]

[0221] An aluminum plate (material 1050, tempered H16) with a thickness of 0.24mm is immersed in a 1% by mass sodium hydroxide aqueous solution at 50°C, and dissolved so that the dissolved amount becomes 2g / m 2 , After washing with water, it was immersed in a 5% by mass nitric acid aqueous solution at 25° C. for 30 seconds, and washed with water after the neutralization treatment.

[0222] Next, pass through the electrolyte containing 11g / L hydrochloric acid, 10g / L acetic acid, and 8g / L aluminum, using sinusoidal alternating current, at a peak current of 80A / dm 2 Under the condition of , the aluminum plate was subjected to electrolytic rough...

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Abstract

This invention provides a printing plate material that has high sensitivity, high printing properties and excellent stability in a light room, i.e., good storage stability and workability in a light room and is less likely to cause contamination of a printing machine. The printing plate material comprises a support having a hydrophilic surface, and (A) a press developable image forming layer and (B) a press developable overcoat layer provided in that order on the support and is characterized in that the press developable image forming layer (A) contains the following (a1) to (a3) and the press developable overcoat layer (B) contains the following (b). (a1) A compound having a radical polymerizable ethylenically unsaturated bond (a2) A polymerization initiator which can generate radicals upon interaction with an infrared absorbing agent (a3) An infrared absorbing agent (b) Water insoluble particles formed of a composite of a water insoluble compound (b1) having no ultraviolet absorbing capability and a compound (b2) having an ultraviolet absorbing capability.

Description

technical field [0001] The present invention relates to a printing plate material, in particular to a printing plate material capable of forming an image by computer to plate (CTP) method. Background technique [0002] With the digitalization of printing data, a CTP printing plate material that is cheap, easy to operate and has printability comparable to PS plates is being sought. In particular, in recent years, CTP printing plate materials (hereinafter referred to as CTP) of various systems based on ultraviolet (405 nm) to infrared laser recording have been proposed. [0003] As one of these CTPs, there is a method of changing the solubility of an image-forming layer of a printing plate material in a developer by exposure to form an image by liquid development, which is generally called a wet CTP method. However, this method has various problems as follows. Like the conventional PS plate, an alkaline developer dedicated to development is required, and development may be ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41N1/14G03F7/00G03F7/004G03F7/11
CPCG03F7/092B41C1/1016B41C1/1008B41C2201/02B41C2201/04B41C2201/10B41C2201/12B41C2201/14B41C2210/04B41C2210/08B41C2210/22B41C2210/24
Inventor 森孝博
Owner KONICA MINOLTA MEDICAL & GRAPHICS INC
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