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Lithographic printing plate precursor and lithographic printing method

A technology of lithographic printing plate and original plate, applied in the field of plate making of lithographic printing plate original plate, to achieve the effect of high on-machine developability

Active Publication Date: 2012-07-04
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in JP-A-6-87908, there is no example of using a star polymer in a printing plate

Method used

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  • Lithographic printing plate precursor and lithographic printing method
  • Lithographic printing plate precursor and lithographic printing method
  • Lithographic printing plate precursor and lithographic printing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 6 and comparative example 1 to 3

[0263] [Preparation of lithographic printing plate precursors (1) to (9)]

[0264] (Preparation of Support (No. 1))

[0265] An aluminum plate having a thickness of 0.3 mm according to JIS A1050 was processed by sequentially performing the steps (a) to (k) given below.

[0266] (a) Mechanical surface roughening

[0267] Mechanical surface roughening of the aluminum plates was performed by means of rotating roller nylon brushes while a suspension of abrasive (silica sand) in water (with a specific gravity of 1.12) was supplied as an abrasive slurry to the surface of the aluminum plates. The abrasive has an average particle size of 8 μm and a maximum particle size of 50 μm. The material of the nylon brush is 6.10 nylon, and the brush has a hair length of 50 mm and a hair diameter of 0.3 mm. Nylon brushes were fabricated by making holes in a stainless steel cylinder with a diameter of 300 mm and densely inserting bristles. Use three rotating nylon brushes. Two support rolls ...

Embodiment 7 to 15

[0318] [Preparation of lithographic printing plate precursors (10) to (18)]

[0319] (formation of undercoat layer)

[0320] A methanol solution of the polymer compound (1) (weight average molecular weight (Mw): 35,000) shown above was coated on the aluminum support described above by a wire bar and dried at 80° C. for 60 seconds to form an undercoat layer . The coating weight is 0.02g / m 2 .

[0321] (Formation of image recording layer)

[0322] The coating solution (2) for the image forming layer was coated on the support with the undercoat layer using a bar and dried in an oven at 100° C. for 60 seconds to form a film having a thickness of 1.0 g / m 2 The dry coating amount of the image-recording layer. The coating liquid (2) for the image-recording layer was prepared by mixing the photosensitive liquid (1) given below with the microcapsule solution (2) given below just before coating, followed by stirring.

[0323]

[0324]

[0325] Radical polymerization initiator...

Embodiment 16 to 56 and comparative example 4 to 7

[0352] [Preparation of lithographic printing plate precursors (19) to (63)]

[0353] (Preparation of Support (No. 2))

[0354] An aluminum plate (material: JIS A 1050) having a thickness of 0.3 mm was subjected to a degreasing treatment at 50° C. for 30 seconds using a 10% by weight aqueous solution of sodium aluminate to remove rolling oil on its surface, and then three plants with a diameter of 0.3 mm were used. A nylon brush with nylon bristle bundles and an aqueous suspension of pumice with a median particle size of 25 μm (specific gravity: 1.1 g / cm 3 ) to grain its surface, followed by thorough washing with water. The plate was etched by immersing it in a 25% by weight aqueous sodium hydroxide solution at 45°C for 9 seconds, washed with water, then immersed in a 20% by weight aqueous nitric acid solution at 60°C for 20 seconds, and washed with water. The erosion amount of the grained surface is about 3g / m 2 .

[0355] Next, electrochemical roughening treatment was con...

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Abstract

The invention relates to a lithographic printing plate precursor and a lithographic printing method. The lithographic printing plate precursor includes a support and an image-recording layer containing a binder, a radical polymerizable compound and a radical polymerization initiator, wherein the binder comprises a multifunctional thiol having from 6 to 10 functional groups as a nucleus and polymer chains connected to the nucleus through a sulfide bond and the polymer chains have polymerizable group.

Description

technical field [0001] The present invention relates to a lithographic printing plate precursor and a lithographic printing method using the lithographic printing plate precursor. More specifically, the present invention relates to a lithographic printing plate precursor capable of direct plate-making by image exposure with a laser, and a plate-making method (printing method) of a lithographic printing plate precursor by on-press development. Background technique [0002] Typically, lithographic printing plates consist of oleophilic image areas that accept ink during printing and hydrophilic non-image areas that accept fountain solution. Lithography is a printing process that utilizes the nature of water and oil-containing inks to repel each other, and involves making the oleophilic image areas of a lithographic printing plate ink-receptive and the hydrophilic non-image areas fountain solution-receptive. Areas (areas that do not accept ink), thereby creating a difference in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/10G03F7/004
CPCB41C2210/24B41C2210/04B41C2210/08G03F7/004B41C1/1008G03F7/033G03F7/0388G03F7/3035B41C1/1016B41C2201/02B41C2201/04B41C2201/10B41C2201/14B41C2210/22B41C2210/26
Inventor 大桥秀和小山一郎金久真由子森崇德
Owner FUJIFILM CORP
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