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Positive-working lithographic printing plate precursor and method for preparing same

A technology of lithographic printing plate and original plate, applied in lithographic printing equipment, printing, printing technology, etc., can solve the problems of printing operation obstacles, image density drop, etc., and achieve the effect of good image contrast

Inactive Publication Date: 2013-12-04
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]The density drop of the image formed on the aluminum substrate will cause the mark line (トンボ) (register mark) as a mark of registration in multi-color printing ) concentration drops, causing obstacles to printing operations

Method used

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  • Positive-working lithographic printing plate precursor and method for preparing same
  • Positive-working lithographic printing plate precursor and method for preparing same
  • Positive-working lithographic printing plate precursor and method for preparing same

Examples

Experimental program
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Effect test

Embodiment

[0151] Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited to these Examples.

[0152] Synthesis of materials for hydrophilization of substrates

[0153] Vinylphosphonic acid / acrylamide copolymer (molar ratio 1:9)

[0154] Add 3500 g of ethanol to a 10-liter flask equipped with a stirrer, a condenser, and a dropping device, and heat to 70° C. 231.1 g (2.14 mol) of vinylphosphonic acid monomers, 1368.9 g (19.26 mol) of acrylamide, and 52 g of AIBN were dissolved in 1000 g of ethanol, and the solution was added dropwise to the reaction device over 4 hours. During the dropwise addition of the monomer solution, a white precipitate was formed. After further heating and stirring at 70° C. for 2 hours, the heating was stopped and cooled to room temperature. The precipitated white powder was isolated by filtration, washed with 1000 g of ethanol and dried.

[0155] Substrate Manufacturing

[0156...

Synthetic example

[0159] Add 2990 g of dimethylacetamide to a 10-liter flask equipped with a stirrer, a condenser, and a dropping device, and heat to 90° C. Make 740.5g phenylmaleimide, 1001g methacrylamide, 368g methacrylic acid, 643g acrylonitrile, 203.6g Phosmer M (United Chemicals), 222.5g styrene, 10.6g AIBN, 16g n-decyl Dialkylmercaptan was dissolved in 2670 g of dimethylacetamide, and this solution was added dropwise to the reaction device over 2 hours. After completion of the dropwise addition, 5.3 g of AIBN was added, the temperature was raised to 100° C., and stirring was continued for 4 hours. During this period, 5.3 g of AIBN was added every 1 hour to make it react.

[0160] After the reaction, stop heating and cool to room temperature. The reaction solution was poured into 50 liters of water, and the generated precipitate was collected by filtration under reduced pressure, washed with water, and vacuum-dried at 50° C. for 24 hours to obtain resin 1 . The yield was 2873g (yield 9...

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Abstract

The present invention provides a CTP positive-working lithographic printing plate precursor having a favorable image contrast even after baking. This positive-working lithographic printing plate precursor is formed by providing a substrate with an image formation layer containing a water-insoluble and alkali-soluble resin and a photothermal conversion material, wherein the positive-working lithographic printing plate precursor is characterized in that the image formation layer contains an acid dye as a coloring agent.

Description

technical field [0001] The present invention relates to a lithographic printing plate precursor and a plate-making method thereof, in particular to an infrared-sensitive or heat-sensitive lithographic printing plate precursor, especially a positive-working lithographic printing plate precursor, which can be used as a solid-state laser based on a digital signal. Or a so-called CTP (computer to plate) plate in which an image is directly formed by irradiating infrared rays with a semiconductor laser. Background technique [0002] Conventionally, a lithographic printing plate precursor (PS plate) having a photosensitive image-forming layer is known as a planographic printing plate precursor. There are basically two types of PS version, negative version and positive version. When a negative-type plate is exposed and developed using a negative film during exposure, the image-forming layer in the unexposed portion is removed, and the portion insoluble by exposure remains as an ima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/004G03F7/00
CPCG03F7/004B41C2210/02G03F7/105B41C2210/06G03F7/00B41C2210/262B41C1/1016B41C1/1008
Inventor 宫本靖
Owner EASTMAN KODAK CO