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Positive image thermosensitive lithographic printing plate

A lithographic printing plate, printing plate technology, applied in printing, photosensitive materials for optomechanical equipment, printing plate preparation, etc., can solve the problems of low developing latitude, low plate sensitivity, and difficult plate development, etc. Achieve the effect of improving sensitivity and developing latitude, promoting development and improving sensitivity

Inactive Publication Date: 2012-07-04
LUCKY HUAGUANG GRAPHICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the low sensitivity of positive thermal lithographic printing plates, difficulty in developing the plates, and low development latitude.

Method used

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  • Positive image thermosensitive lithographic printing plate
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  • Positive image thermosensitive lithographic printing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0081] Synthesis of Alkali-Soluble Resin R1 Resin

[0082] In a 1000ml four-neck flask, install a top stirrer, a condenser tube, and a dropping funnel, and feed nitrogen gas to eliminate oxygen in the bottle. Add 200ml of ethyl cellosolve, 200ml of DMF, 0.6g of dibenzoyl peroxide, and 20g of acrylamide. Start stirring to dissolve, add 5g of methacrylic acid, 5g of acrylonitrile, 10g of N-phenylmaleimide, stir for 10 minutes, start to heat up to 75°C, react for 1 hour, start to drop mixed monomers (15g of acrylamide, Dissolve 5g of methyl methacrylate in 50ml of ethyl cellosolve), drop it within 1 hour, continue to react for 4 hours, after the reaction, cool down to room temperature, add 0.5g of hydroquinone (dissolved in 50ml of ethyl cellosolve) cellosolve), stirred for 10 minutes, and then slowly added the reaction mixture into 4 liters of water to obtain a white solid, which was filtered, washed three times, and dried in a vacuum oven.

[0083] Prepare the resin layer of p...

Embodiment 6-11

[0108] Synthesis of Solvent Resistant Resin R2 Resin

[0109] In a 1000ml four-necked flask, install a stirring tube, a condenser, and a dropping funnel, and feed nitrogen to remove oxygen in the bottle. Add 200ml of ethyl cellosolve, 200ml of DMF, 0.6g of dibenzoyl peroxide, and 20g of acrylamide. Start stirring to dissolve, add 5g of methacrylic acid, 5g of acrylonitrile, 10g of propylene sulfonamide, stir for 10 minutes, start to heat up to 75°C, react for 1 hour, start to drop mixed monomers (acrylamide 15g, methacrylic acid 5g into 50ml ethyl cellosolve), drop it in 1 hour, and continue to react for 4 hours. minutes, and then slowly add the reaction mixture into 4 liters of water to obtain a white solid, which was filtered, washed three times, and dried in a vacuum oven.

[0110] Prepare the resin layer of the positive thermosensitive lithographic printing plate plate according to the following formula: the formula of embodiment 1-5 replaces RI with R2, IR absorbing dye ...

Embodiment 12

[0113] Prepare the resin layer of positive thermosensitive lithographic printing plates according to the following formula:

[0114] N, N-dimethylformamide (DMF) 6 parts by weight

[0115] 2 parts by weight of water

[0116] 25 parts by weight of ethyl cellosolve

[0117] Acrylic resin R1 1.5 parts by weight

[0118] PAG 5 (Shandong Weihai Tiancheng Chemical Technology Co., Ltd.) 0.11 parts by weight

[0119] IR absorbing dye A (lambdamax = 830nm) (see structure above)

[0120] Eastman kodak, rochester, NV, USA) 0.02 parts by weight

[0121] IR absorbing dye B (lambdamax = 830nm) (see structure above)

[0122] (Eastman kodak, rochester, NV, USA) 0.02 parts by weight

[0123] BYK-307 Polyethoxylated Dimethicone Copolymer

[0124] (BYK Chemie, Wallingford, CT, USA) 0.0035 parts by weight

[0125] Crystal violet (Hodogaya Chemical CO.LTD) 0.04 parts by weight

[0126] Prepare the thermosensitive layer of positive thermosensitive lithographic printing plate plate material...

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Abstract

The invention relates to a positive image thermosensitive lithographic printing plate. A resin layer and a thermosensitive layer are successively coated onto a support with hydrophilic surface, wherein the resin layer comprises alkali-soluble resin, and the thermosensitive layer comprises alkali-soluble resin and infrared absorbent. The resin layer of the positive image thermosensitive lithographic printing plate contains an acid generator and an infrared absorbent. In the invention, the acid generator and the infrared absorbent are added into the resin layer of the double-coating positive image CTP (Computer-to-Plate) plate into heat, so that the acid generator generates acid, and the exposed portion is easily dissolved or dispersed in a developing liquid and removed by the developing liquid. As long as the upper layer is removed, the lower layer is very easy to remove. Unexposed portion does not generate acid and is not easy to remove by the developing liquid, the sensitivity of the plate is increased, the development of the plate is accelerated, and the sensitive and the development latitude of the plate are also improved.

Description

technical field [0001] The invention relates to a heat-sensitive lithographic printing plate, in particular to a positive heat-sensitive lithographic printing plate material suitable for computer-to-plate making. Background technique [0002] With the development of computer image processing technology, people's attention has turned to photosensitive or thermal direct plate-making systems that directly image digital imaging information through laser beams or thermal heads without using silver salt coated films. The use of large-scale semiconductor lasers or YGA lasers has the following advantages over traditional photocuring plate-making methods: high-resolution images can be obtained through short-time exposure to achieve time-saving effects; thermal direct plate-making plates used in the system can be operated under sunlight, To achieve labor-saving effect. [0003] In recent years, the technology of adding a chemically amplified photoresist to a long-wave absorbing dye h...

Claims

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Application Information

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IPC IPC(8): G03F7/09B41C1/10G03F7/004
Inventor 曹雷冯磊李合成门红伟刘松玲杨成祥沈希娟王素华薛新琴张琳
Owner LUCKY HUAGUANG GRAPHICS
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