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Process for producing lithographic printing plate and lithographic printing plate

A technology for lithographic printing plates and manufacturing methods, applied in lithographic printing equipment, printing, printing technology, etc., can solve the problems of tolerance (insufficient development latitude, reduced printing resistance, reduced strength of image parts, etc., and achieve pollution suppression Occurrence, good pollution, and improved hydrophilicity

Inactive Publication Date: 2014-05-14
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in such a positive-working lithographic printing plate material for infrared lasers, the difference in solubility between the unexposed area and the exposed area cannot be sufficiently obtained, and the tolerance of the development conditions suitable for image formation (development latitude (latitude)) cannot be obtained. Insufficient, therefore, if developing with a fatigue developer with reduced activity, residual film may be generated, or if developed with a highly active developer, the strength of the image part may decrease, and the printing durability may decrease

Method used

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  • Process for producing lithographic printing plate and lithographic printing plate
  • Process for producing lithographic printing plate and lithographic printing plate
  • Process for producing lithographic printing plate and lithographic printing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0299]

[0300] For the JIS A1050 aluminum plate with a thickness of 0.3mm, use pumice-water suspension as the abrasive to grind the surface with a rotating nylon brush. The surface roughness (center line average roughness) at this time was 0.5 μm. After washing with water, immerse in a solution heated to 70°C with 10% sodium hydroxide aqueous solution so that the amount of aluminum dissolved becomes 6g / m 3 etched in a manner. After washing with water, it was immersed in a 30% nitric acid aqueous solution for 1 minute to neutralize, and it was fully washed with water.

[0301] Then, in a 0.7% nitric acid aqueous solution, use a rectangular wave AC waveform voltage with a voltage of 13 volts at the anode and a voltage of 6 volts at the cathode for 20 seconds for electrolytic roughening, immerse in a 50°C solution of 20% sulfuric acid, and wash the surface , wash with water. In a 20% sulfuric acid aqueous solution, the roughened aluminum plate was subjected to a porous anod...

Embodiment 2～7、 comparative example 1～4

[0333] The specific polymer (P-1) used in the above-mentioned intermediate layer coating liquid 1 was replaced with the specific polymer (P-2), (P-3), (P-4), (P-5) exemplified above, respectively. ), (P-6) and (P-7), except that, in the same manner as in Example 1, an intermediate layer and an image forming layer were formed to obtain lithographic printing plate precursors in Examples 2 to 7.

[0334]In addition, the specific polymer (P-1) used in the above-mentioned intermediate layer coating liquid 1 was replaced with the comparative polymers (PN-1), (PN-2), (PN-3) and ( PN-4), except that, it carried out similarly to Example 1, formed the intermediate layer and the image formation layer, and obtained the lithographic printing plate precursor of Comparative Example 1-Comparative Example 4.

[0335] [chemical formula 25]

[0336]

[0337] (Plate making and evaluation of lithographic printing plate masters)

[0338] Using the obtained lithographic printing plate precursor...

Embodiment 8

[0369] (Example 8 to Example 9, Reference Example 10)

[0370] The lithographic printing plate precursor according to the present invention obtained in Example 2 above was used, and the treatment solutions (D-2), (D-3) and (D-4) were used instead of the treatment solution (D-1), except that Except that, it carried out similarly to Example 2, the lithographic printing plate was produced, and it evaluated similarly. The results are shown in Table 2.

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Abstract

A process for producing a lithographic printing plate which comprises a step of subjecting a positive presensitized plate for lithographic printing to image-wise exposure and a step of developing the thus exposed plate with a treatment fluid having a pH of 7 to 12, said positive presensitized plate being provided with both an intermediate layer that contains a polymer comprising repeating units represented by general formula (I-1) and repeating units represented by general formula (I-2) and that has a dry-base coating weight of 2 to 200 mg / m2 and a positive image forming layer on the substrate successively.

Description

technical field [0001] The present invention relates to a method for manufacturing a planographic printing plate using an infrared sensitive planographic printing plate precursor, and a planographic printing plate obtained by the manufacturing method. Background technique [0002] Conventionally, various photosensitive compositions have been used as visible image forming materials and lithographic printing plate materials. In particular, lasers used in lithography have been remarkably developed in recent years. In particular, solid-state lasers and semiconductor lasers having light emitting regions from near infrared to infrared have become available as high-power and compact devices. These lasers are very useful as an exposure light source for direct plate making from digital data such as a computer. [0003] An infrared sensitive positive-working planographic printing plate precursor suitable for recording with an infrared laser contains an alkali-soluble binder resin, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/11G03F7/00G03F7/004G03F7/32
CPCG03F7/322B41C1/1016B41C2201/04B41C2201/14B41C2210/02B41C2210/06G03F7/11
Inventor 藤井重克田口贵规青岛德生
Owner FUJIFILM CORP
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