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Photosensitive lithographic printing plate material developable with water

A lithographic printing plate, photosensitivity technology, applied in the field of photosensitive lithographic printing plate materials, to achieve the effect of excellent printing resistance and no dirty plate

Inactive Publication Date: 2010-01-27
MITSUBISHI PAPER MILLS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, as the substrate having a hydrophilic surface, a silicate-treated aluminum plate and a film support provided with a hydrophilic primer layer are exemplified, but it is difficult to simultaneously satisfy various printing conditions in any combination. Under the two properties of smudge prevention and brush resistance, research on raw materials and composition-related research are required for further optimization

Method used

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  • Photosensitive lithographic printing plate material developable with water
  • Photosensitive lithographic printing plate material developable with water
  • Photosensitive lithographic printing plate material developable with water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9

[0190] (support body)

[0191] A polyethylene terephthalate film having a thickness of 100 μm having an undercoat layer laminated with vinylidene chloride and gelatin in this order was used as a support.

[0192] (hydrophilic layer)

[0193] Using the above support, a hydrophilic layer represented by the following formulation was formed on the support. Coating was performed using a wire bar so that the coating amount of the hydrophilic layer was 2 g per 1 square meter in terms of dry mass. Drying was carried out by heating for 20 minutes in a dryer at 80°C. Further, the sample was heated in a dryer at 40° C. for 3 days, and then applied to the photocurable photosensitive layer.

[0194] (Hydrophilic layer coating solution formula)

[0195] Water-soluble polymer (table 1) solution (10% concentration) 10g

[0196] Colloidal silica (Snowtex PS-S manufactured by Nissan Chemical Industry Co., Ltd.)

[0197] (20% concentration) 10g

[0198] Cros...

Embodiment 10～13 and comparative example 10～12

[0257] In the formulation of the following hydrophilic layer coating liquid, samples 10 to 13 and comparative samples were prepared in the same manner as in Example 1, except that the ratio of colloidal silica to the water-soluble polymer and the type of colloidal silica were changed. Samples 10 to 12 were subjected to various evaluations in the same manner as in Example 1.

[0258] (Hydrophilic layer coating solution formula)

[0259] Water-soluble polymer (S-1) solution (10% concentration) X (g) in table 6

[0260] Colloidal silica (Snowtex manufactured by Nissan Chemical Industries, Ltd.)

[0261] (20% concentration) Y (g) in Table 6

[0262] Cross-linking agent (E-3) X / 10(g)

[0263] Pure water 10g

[0264] [Table 6]

[0265]

X(g)

Y(g)

Types of Colloidal Silica

Example 10

10

5

PS-S (Necklace)

Example 11

10

15

PS-S (Necklace)

Example 12

10

5

S (sphe...

Embodiment 14～22

[0270] In Examples 14 to 22, photosensitive lithographic printing plate materials 14 to 22 were obtained in the same manner as in Examples 1 to 9 except that an aluminum plate for offset printing provided with a roughened anodized film was used as a support for printing plates. These materials were loaded into PT-R4000 as they were, and drawing was performed in the same manner as in Examples 1 to 9, and a water developability test, a printability test (up to 100,000 sheets) and printing on a printing machine were performed in the same manner as in the previous examples. Visibility test. The results are summarized in Table 8.

[0271] [Table 8]

[0272]

[0273] As seen in Table 8, in the results of any of the examples, good printing durability of more than 50,000 sheets was shown, and good water developability, resolution, water retention, ink release, and on-press development were shown sex.

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Abstract

A photosensitive lithographic printing plate material developable with water characterized by comprising: a substrate; a hydrophilic layer formed on the substrate and comprising a water-soluble polymer, a crosslinking agent for crosslinking the water-soluble polymer, and colloidal silica, the mass ratio of the water-soluble polymer to the colloidal silica being from 1:1 to 1:3; and a photocurable photosensitive layer formed on the hydrophilic layer and comprising a polymer having sulfo and vinylphenyl groups in side chains, the vinylphenyl group being bonded to the main chain through a connecting member comprising a heterocycle, a photopolymerization initiator, and a compound for sensitizing the initiator. The photosensitive lithographic printing plate material is a photosensitive lithographic printing plate having high sensitivity and usable in a CTP system. It can be developed with water, can be developed even on a printing machine, and has excellent suitability for printing.

Description

technical field [0001] The present invention relates to a photosensitive lithographic printing plate material that can be developed by water, in particular to a photosensitive lithographic printing plate material that can form images in a computer-to-plate (CTP) manner. More specifically, the present invention relates to a photosensitive lithographic printing plate material capable of forming an image by water development using a scanning exposure device using a light source such as a semiconductor laser that emits light in the 750-1100 nm or 400-430 nm wavelength region. In addition, the present invention relates to a photosensitive lithographic printing plate material which can be developed on-press with a fountain solution on a printing press. Background technique [0002] In recent years, computer-to-plate (CTP) technology, which is based on digital data created on a computer, is directly output to a printing plate instead of a film, and various plate-making machines equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/11G03F7/00G03F7/038
CPCB41N3/036B41C1/1016B41C2201/02G03F7/0388B41C1/1008G03F7/11B41C2201/14B41C2210/04B41C2210/08B41C2210/22B41C2210/24
Inventor 古川彰
Owner MITSUBISHI PAPER MILLS LTD
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