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Photosenstivie resin compositive for printing plate precursor capable of laser engraving

A technology of photosensitive resin and laser engraving, which is applied in the field of photosensitive resin composition, and can solve the problems of lack of plate thickness accuracy and dimensional accuracy

Inactive Publication Date: 2004-08-18
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been no original material for laser engraving that has high plate thickness accuracy and dimensional accuracy, is easy to laser engrave, and solves the problems associated with chipping.

Method used

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  • Photosenstivie resin compositive for printing plate precursor capable of laser engraving

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0110] In a 1L separable flask equipped with a thermometer, a stirrer, and a reflux device, 500 g of polytetramethylene glycol (Mn: 1,830, OH value: 61.3) and 52.40 g of benzylidene diisocyanate manufactured by Asahi Kasei Co., Ltd. g, react at 60°C for about 3 hours while heating. Thereafter, 25.24 g of 2-hydroxypropyl methacrylate and 31.75 g of polypropylene glycol monomethacrylate (Mn: 400) were added, and the reaction was continued for 2 hours to obtain a methacryloyl group terminal (containing in one molecule). The average number of unsaturated groups is about 2), and the number average molecular weight is about 20,000 resin (I). The resin is a viscous liquid at 20°C, a plastic that flows when an external force is applied and does not return to its original state when the external force is removed.

manufacture example 2

[0112] In a 1 L separable flask equipped with a thermometer, a stirrer, and a reflux device, 500 g of polycarbonate diol (trademark: Kuraray Polyol C-2015N) (Mn: 2,000, OH value: 56.0) manufactured by Kuraray Co., Ltd. of Japan and 49.86 g of benzylidene diisocyanate was reacted for about 3 hours while heating at 60°C. Thereafter, 26.63 g of 2-hydroxypropyl methacrylate and 35.27 g of polypropylene glycol monomethacrylate were added and reacted for a further 2 hours to obtain a polymerizable unsaturated group whose terminal was a methacryloyl group (polymerizable unsaturated group contained in 1 molecule). The average number of about 2), the resin (II) with a number average molecular weight of about 15,000. The resin is a viscous liquid at 20°C, a plastic that flows when an external force is applied and does not return to its original state when the external force is removed.

manufacture example 3

[0114] In a 1 L separable flask equipped with a thermometer, a stirrer, and a reflux device, 500 g of polyisoprene polyalcohol (trademark: LIR-506) (Mn: 16,400, OH value: 17.1) manufactured by Kuraray Co., Ltd. of Japan and 23.65 g of 2-methacryloyloxyisocyanate was reacted at 60° C. for 7 hours. Resin (III) having a terminal methacryloyl group (the average number of polymerizable unsaturated groups contained in 1 molecule: 5) and a number average molecular weight of about 17,200 was obtained. This resin is a viscous liquid at 20°C, a plastic that flows when an external force is applied and does not return to its original state when the external force is removed.

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Abstract

Disclosed is a photosensitive resin composition for forming a laser engravable printing element, comprising: (a) 100 parts by weight of a resin which is a plastomer at 20 DEG C, wherein the resin has a number average molecular weight (Mn) of from 1,000 to 100,000 and has a polymerizable unsaturated group in an amount such that the average number of the polymerizable unsaturated group per molecule is at least 0.7, (b) 5 to 200 parts by weight, relative to 100 parts by weight of resin (a), of an organic compound having an Mn of less than 1,000 and having at least one polymerizable unsaturated group per molecule, and (c) 1 to 100 parts by weight, relative to 100 parts by weight of resin (a), of an inorganic porous material. Also disclosed is a laser engravable printing element formed from the above-mentioned resin composition.

Description

technical field [0001] The present invention relates to a photosensitive resin composition for a laser-engravable original printing plate. More specifically, it relates to a polymerizable unsaturated group containing (a) a number average molecular weight of 1,000 to 100,000, an average number of polymerizable unsaturated groups in one molecule of at least 0.7, and plastic at 20°C. (b) 5 to 200 parts by weight of an organic compound having a number average molecular weight of less than 1,000 and containing at least one polymerizable unsaturated group per molecule, and (c) an inorganic porous body. Using the photosensitive resin composition of the present invention, it is possible to produce a printing plate having high plate thickness accuracy, less chipping during laser engraving, excellent laser engraved shape, and low adhesiveness on the printing surface. Furthermore, this invention relates to the original printing plate for laser engraving which uses the photosensitive res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/05B41C1/10B41M5/26B41N1/12C08K5/103C08K5/29G03F7/004G03F7/027G03F7/035
CPCB41C1/05G03F7/0047G03F7/035B41M5/267G03F7/027Y10S430/146C08K5/103C08K5/29B41N1/12
Inventor 横田昌久留场启山田浩荒木祥文
Owner ASAHI KASEI KK