Negative photosensitive composition and negative photosensitive lithographic printing plate

A negative photosensitive and composition technology, which is applied in the field used in China, can solve the problems of insufficient intensity of image parts, decreased sensitivity, and decreased sensitivity, and achieves the effects of excellent storage stability and high sensitivity.

Active Publication Date: 2007-01-17
柯达彩色绘图日本株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this negative photosensitive lithographic printing plate, the polymerization is inhibited by the oxygen in the air during the radical polymerization, and the sensitivity is reduced. In addition, the strength of the formed image part is not sufficient, and the printing durability is not good. question
On the other hand, this negative photosensitive lithographic printing plate suffers from a decrease in sensitivity over time from the time of manufacture, and poor storage stability.

Method used

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  • Negative photosensitive composition and negative photosensitive lithographic printing plate
  • Negative photosensitive composition and negative photosensitive lithographic printing plate
  • Negative photosensitive composition and negative photosensitive lithographic printing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0169] As shown in the compounding table of Table 1, 0.3 g (3% by weight) of a near-infrared-absorbing cationic dye (A-1) represented by the following formula (A-1) (manufactured by Showa Denko, IRB) was used as (A) Infrared absorber; 0.6g (6% by weight) organoboron compound (B-1) represented by the following formula (B-1) (manufactured by Showa Denko, P3B) as (B) organoboron compound; 0.9g (9% by weight %) the  salt (C-1) (manufactured by Wako Pure Chemical Industries) shown in the above-mentioned formula (6) as (C)  salt; (D) A compound having a polymerizable unsaturated group; 4.7 g (47% by weight) of the above-mentioned acrylic resin (E-1) of an alkali-soluble resin as (E) a binder resin; 0.2 g of DC-190 ( 10% ethylene glycol monomethyl ether solution, manufactured by ィーストマンコテックカンパニニ) as a surfactant; 0.3 g of D-11 (manufactured by PCAS) as a coloring material, and the above-mentioned substances were dissolved in a solution containing 70.0 g of ethylene glycol monomethyl...

Embodiment 2～10、 comparative example 1～3

[0179] A negative photosensitive lithographic printing plate was produced and evaluated in the same manner as in Example 1, except that the composition of the coating liquid was changed to that shown in Table 1. The evaluation results are shown in Table 2. Here, the near-infrared-absorbing cationic dye (A-2) in Table 1 is a substance represented by the following formula (A-2) (manufactured by Eastman Chemical Co., Ltd.), and the near-infrared-absorbing cationic dye (A-3) is The substance represented by the following formula (A-3) (manufactured by Showa Denko, IRT), the organoboron compound (B-2) is the substance represented by the following formula (B-2) (manufactured by Showa Denko, NP3B),  The salt (C-2) is a substance represented by the above formula (7), the  salt (C-3) is a substance represented by the following formula (C-3) (manufactured by Wako Pure Chemical Industries), and the  salt (C-4) is The substance represented by the following formula (C-4) (manufactured b...

Embodiment 11～19、 comparative example 4～5

[0204] A negative photosensitive lithographic printing plate was produced and evaluated in the same manner as in Example 1, except that the composition of the coating solution was changed to that shown in Table 3. The evaluation results are shown in Table 4. Here, the near-infrared-absorbing cationic dye (A-2) in Table 3 is the same as that used in Comparative Example 3, and the  salts (C-1) to (C-3) are the same as those used in Examples 1 to 6. Similarly,  salts (C-9) to (C-11) are the ones shown below (manufactured by Wako Pure Chemical Industries), and the acrylic resin (E-3) is allyl methacrylate / methacrylic acid copolymer (manufactured by Gifu Shellac Co., Ltd.), and the polymerization initiator was the same as that used in Comparative Example 2.

[0205] negative photosensitive composition

[0206] [chem 25]

[0207] Salt (C-9)

[0208]

[0209] [chem 26]

[0210] Salt (C-10)

[0211]

[0212] [chem 27]

[0213] Salt (C-11)

[0214]

[021...

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Abstract

The present invention relates to a negative photosensitive composition comprising (A) an infrared absorber, (B) an organoboron compound that functions as a polymerization initiator by using in combination with (A) the infrared absorber, (C) an onium salt , and (D) a compound having a polymerizable unsaturated group. By using the negative photosensitive composition of the present invention, it is possible to provide a negative photosensitive composition that can be cured by infrared rays, is less likely to be inhibited by oxygen during radical polymerization, and has excellent storage stability, and provides a The negative photosensitive lithographic printing plate directly forms an image by irradiating infrared rays irradiated from a solid-state laser or a semiconductor laser based on a digital signal without preheating, has high sensitivity, and has excellent printing resistance and storage stability.

Description

technical field [0001] This application claims priority corresponding to Japanese Patent Application No. 2003-431478 filed on December 25, 2003, and uses its contents. [0002] The present invention relates to a negative photosensitive composition and a negative photosensitive lithographic printing plate used in the field of offset printing, in particular to a digital signal-based method for directly forming images by irradiating infrared rays emitted from solid-state lasers or semiconductor lasers, That is, a negative photosensitive lithographic printing plate used as a so-called computer-to-plate (CTP) plate, and a negative photosensitive composition suitable for the photosensitive layer of the above-mentioned lithographic printing plate. Background technique [0003] In recent years, with the advancement of computer image processing technology, a method of writing an image on a direct photosensitive layer by irradiating light corresponding to a digital signal has been dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/004G03F7/029G03F7/00G03F7/033B41C1/10B41M5/36
CPCG03F7/029B41M5/368B41C1/1008B41C1/1016B41C2201/02B41C2201/14B41C2210/04B41C2210/06B41C2210/20B41C2210/22B41C2210/24
Inventor 林浩司樱井荣男早川英次
Owner 柯达彩色绘图日本株式会社
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