Method for producing planographic printing plate precursor

A technology for lithographic printing plates and original plates, which is used in the field of preparing negative-type lithographic printing plate original plates to achieve the effects of improving on-machine developability and improving developability.

Inactive 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, this cannot be carried out far enough to achieve sufficient effect due to limitations in coating performance in production
[0007] The problem with the above-mentioned method of intensifying drying conditions is that the layer is completely densified and the thermal reaction of the drying object occurs throughout the entire layer

Method used

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  • Method for producing planographic printing plate precursor
  • Method for producing planographic printing plate precursor
  • Method for producing planographic printing plate precursor

Examples

Experimental program
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Effect test

preparation example Construction

[0175] [About the production method other than the image-recording layer]

[0176] [Coating and drying of top coat]

[0177] After that, in the overcoat coating and drying unit 26, an overcoat (PVA coating film) containing a water-soluble polymer having a hydrogen bonding group, for example, PVA (polyvinyl alcohol) as a main composition is formed. As for the coating method, the same coating method as that used for forming the back coat layer, undercoat layer or image recording layer can be employed.

[0178] Examples of water-soluble polymers having hydrogen-bonding groups contained in the overcoat include polyvinyl alcohol, partial esters, ethers, and acetals thereof, and unsubstituted ethylene in an amount sufficient to impart the desired water-solubility to the copolymer. Copolymers of alcohol units. As polyvinyl alcohol, those hydrolyzed by 71 to 100 mol % and having a degree of polymerization in the range of 300 to 2,400 are exemplified. In detail, for example, PVA-105...

Embodiment 1 to 12 and comparative example 1 to 2

[0247] [Preparation of Lithographic Printing Plate Master]

[0248] (1) Preparation of carrier (No. 1)

[0249] An aluminum plate (material: JISA 1050) having a thickness of 0.3 mm was degreased 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 Nylon brush with nylon bristles of 0.3 mm and an aqueous suspension of pumice with a median size of 25 μm (specific gravity = 1.1 g / cm 3 ) Graining the surface of the aluminum plate, and then fully washing with water. The plate was etched by dipping in 25 wt% aqueous sodium hydroxide solution at 45°C for 9 seconds, washed with water, then dipped in 20 wt% nitric acid solution at 60°C for 20 seconds, and washed with water. The amount of etching on the grained surface is about 3g / m 2 .

[0250]Then, the electrochemical roughening treatment was continuously performed on the plate using an alternating current of 60 Hz. The electrolytic solution used ...

Embodiment 21 to 34 and comparative example 11 and 12

[0309] [Preparation of Lithographic Printing Plate Master]

[0310] (1) Formation of image recording layer

[0311] A coating liquid (2) for an image-recording layer shown below was coated on the support having the above-mentioned undercoat layer using a bar coater. The coated image-recording layer was dried under the conditions described in Table 2 to confirm properties. The dry coating amount of the image recording layer is 1.1 g / m 2 .

[0312]

[0313]

[0314] The compounds represented by their trade names in the above compositions are given below.

[0315] IRGACURE 250: (4-Methoxyphenyl)[4-(2-methylpropyl)phenyl]iodo Hexafluorophosphate

[0316] (75% by weight propylene carbonate solution)

[0317] SR-399: Dipentaerythritol Pentaacrylate

[0318] BYK 336: Modified dimethyl polysiloxane copolymer (25% by weight xylene / methoxypropyl acetate solution)

[0319] KLUCEL M: Hydroxypropylcellulose (2% by weight aqueous solution)

[0320] ELVACITE 4026: highly branc...

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Abstract

Provided is a method for producing a planographic printing plate precursor which is superior in development property and plate life, wherein when an overcoat layer is coated and dried on an image recording layer, mixing of these layers can be suppressed. The method for producing a polymerizable planographic printing plate precursor comprises(a) a step of coating a coating liquid of an image recording layer on a support, the coating liquid containing (A) a sensitizing dye, (B) a radical polymerization initiator, and (C) a radical polymerization compound, (b) a first drying step for supplying hot air to the image recording layer, (c) a second drying step for supplying hot air and superheated steam to the image recording layer after the first drying step, (d) a step of coating an overcoat layer on the image recording layer, and (e) a step of drying the overcoat layer.

Description

technical field [0001] The present invention relates to a method for producing a negative-working lithographic printing plate precursor capable of image recording with laser light and containing a polymerizable compound. In detail, the present invention relates to a method for producing a negative-working lithographic printing plate precursor capable of being developed on a printing press with at least any one of ink and fountain solution and containing a polymerizable compound. 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 during printing. Lithography is a printing process that exploits the property that water and oil-based inks repel each other, and involves using the oleophilic image areas of a lithographic printing plate as ink-receiving areas and its hydrophilic non-image areas as fountain solution-receiving areas (not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41N1/14G03F7/00G03F7/11
CPCB41C2210/22G03F7/092B41C2210/08B41C2210/04G03F7/168B41C2201/02B41C2210/24B41C2201/10B41C2201/14B41C1/1016G03F7/027
Inventor 森崇德林贤二
Owner FUJIFILM CORP
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