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(ethylene, vinyl acetal) copolymers and their use in lithographic printing plate precursors

A technology of copolymer and acetal, which is applied in lithography equipment, printing, printing technology, etc., and can solve the problems of poor storage stability of precursors

Inactive Publication Date: 2017-05-24
AGFA NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These crystalline defects become more pronounced when the printing plate precursors are stored prior to exposure and development, i.e. poor storage stability of the precursors

Method used

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  • (ethylene, vinyl acetal) copolymers and their use in lithographic printing plate precursors
  • (ethylene, vinyl acetal) copolymers and their use in lithographic printing plate precursors
  • (ethylene, vinyl acetal) copolymers and their use in lithographic printing plate precursors

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[0115]

[0116]

[0117]

[0118]

[0119] The (ethylene, vinyl acetal) copolymers are useful as binders in coatings of image recording materials such as lithographic printing plate precursors or printed circuit board precursors. The lithographic printing plate precursor preferably comprises a thermosensitive and / or photosensitive coating and is preferably positive working, i.e. after exposure and development the exposed areas of the coating are removed from the support and define hydrophilic (non-printing) areas, whereas The unexposed coating is not removed from the support and defines the oleophilic (printing) areas.

[0120] The photosensitive and / or thermosensitive coating comprising the (ethylene, vinyl acetal) copolymer may comprise one layer or more than one layer. The coating preferably comprises at least two layers; a first layer, and a second layer located on said first layer. A first layer means that the layer is closer to the lithographic support than ...

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Abstract

A copolymer comprising (i) a plurality of ethylenic moieties A having a structure according to the following formula: (A) wherein R2 and R3 independently represent hydrogen, a halogen or an optionally substituted linear, branched or cyclic alk(en)yl group, or an optionally substituted aromatic or heteroaromatic, and (ii) a plurality of acetal moieties B having a structure according to the following formula: (B) wherein L1 represents a divalent linking group; x = 0 or 1 and R1 represents an optionally substituted aromatic or heteroaromatic group including at least one hydroxyl group, and (iii) a plurality of acetal moieties C and / or moieties D which include a structural moiety comprising a chromophoric group having its main absorption in the infrared region.

Description

[0001] field of invention [0002] The present invention relates to (ethylene, vinyl acetal) copolymers and lithographic printing plate precursors comprising such copolymers. [0003] Background of the invention [0004] Lithographic printing usually involves the use of so-called printing masters, such as printing plates mounted on the cylinders of a rotary printing press. The master bears a lithographic image on its surface and prints are obtained by applying ink to the image and then transferring the ink from the master to a receiving material, which is usually paper. In traditional lithography, ink and an aqueous fountain solution (also known as fountain solution) are supplied to areas composed of oleophilic (or hydrophobic, that is, ink-accepting, water-repellent) areas and hydrophilic (or oleophobic, that is, water-accepting, repellent) areas. ink) area on the lithographic image. In so-called dry offset printing, the lithographic image is made up of ink-accepting and ink...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/36C08F218/10C08F210/02C08F8/28
CPCB41C1/1008B41C2210/02B41C2210/06B41C2210/24B41C2210/26C08F8/28C08F216/38C08F218/10C09D129/14C08F210/02B41C1/1066B41N1/14C08F8/30C09B69/105G03F7/039G03F7/11G03F7/16G03F7/168G03F7/2006G03F7/3085G03F7/322G03F7/40
Inventor T.德斯梅特J.洛库菲尔
Owner AGFA NV
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