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Photosensitive layer for UV-CTP

A UV-CTP and photosensitive layer technology, applied in the field of photosensitive layer, can solve harmful and other problems, and achieve the effect of good lipophilicity, high printing resistance and good repayment

Pending Publication Date: 2016-11-16
XINGRAPHICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the addition of diazo compounds and resins is detrimental to plates intended for "no treatment" plates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The chemical-free negative photosensitive composition suitable for UV-CTP of the present invention mainly includes the following six components: (1) an unsaturated water-soluble polymer of -(X)-(Y)-(Z)-structure , and (2) a photopolymerizable prepolymer, and (3) a polyfunctional monomer, and (4) one or more photopolymerization initiators, and (5) one or one More than one kind of dyes or pigments, and (6) one or more solvents; wherein, X represents a copolymerization unit containing a sulfonic acid group, and Y represents a branched carboxylic acid copolymerization unit containing two unsaturated double bonds , Z represents an acrylate copolymerized unit containing an unsaturated double bond branch.

[0022] In the present invention, X is selected from ethylenesulfonic acid, styrenesulfonic acid and isoprenesulfonic acid. X accounts for 10% molar ratio of the copolymer. Y is a branched acrylic or methacrylic copolymerized unit containing two unsaturated double bonds. ...

Embodiment 2

[0026] The -(X)-(Y)-(Z)-structure polymer in the photosensitive composition of the present invention is a water-soluble polymer containing an unsaturated double bond. Wherein, X represents a copolymerization unit containing sulfonic acid groups, Y represents a carboxylic acid copolymerization unit containing two unsaturated double bond branches, and Z represents an acrylate copolymerization unit containing one unsaturated double bond branch chain.

[0027] As the copolymerized unit represented by X, any compound may be used as long as it is a compound containing an ethylenically unsaturated group and a sulfonic acid group. The ethylenically unsaturated group guarantees copolymerization with other units, and the sulfonic acid group ensures better water solubility. X may be selected from ethylenesulfonic acid, styrenesulfonic acid, isoprenesulfonic acid and the like. The proportion of X in the whole polymer is in the range of 10% to 20% molar ratio, preferably 15% to 25%. When...

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Abstract

The invention discloses a photosensitive layer for UV-CTP. The photosensitive layer comprises (1) an unsaturated water soluble polymer with a -(X)-(Y)-(Z)- structure, (2) a photopolymerisable prepolymer, (3) a polyfunctional monomer, (4) one or more photoplymerization initiator and (5) one or more dye or pigment, wherein the photosensitive layer is characterized in that X represents a copolymer unit containing a sulfonic acid group; Y represents a carboxylic acid copolymer unit containing two unsaturated double bonds; and Z represents an acrylate copolymer unit containing an unsaturated double-bond branched chain. According to the photosensitive layer, the lithograph plate photosensibility is high and the dot reducibility is good after a photosensitive composition is utilized; an ultraviolet light source can be directly washed by running water or can be printed on a computer without any washing or processing step after being exposed; and high pressrun can be obtained.

Description

technical field [0001] The invention relates to a UV-CTP, in particular to a photosensitive layer for UV-CTP. Background technique [0002] As we all know, the plate-making process of lithographic plates requires at least two steps to complete. One is to expose the printing plate coated with the photosensitive composition to a specific light source through a mask (such as a positive film type and a negative film type mask), thereby And form a light image latent image; the second is to carry out a so-called subsequent development step on the printing plate after the upper exposure, through this process, remove the excess coating. Pre-coated photosensitive lithography is a sheet-like material supported by aluminum or polyester, and can be prepared through the above two steps to have both lipophilic and hydrophilic surfaces, suitable for lithographic printing. Typically, in a negative-type system, the exposed areas become insoluble or insoluble in the developer as a result of ...

Claims

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Application Information

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IPC IPC(8): G03F7/004
CPCG03F7/004
Inventor 张纯子刘亚林黎仕友杨志荣
Owner XINGRAPHICS CO LTD
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