Support for lithographic printing plate and presensitized plate

A lithographic printing plate and carrier technology, which is applied in the field of lithographic printing plate carrier and pre-sensitized plate, can solve the problems that it is impossible to obtain a pre-sensitized plate, and achieve good scum resistance, long printing life, high The effect of sensitivity

Inactive Publication Date: 2005-03-30
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is impossible to obtain a pre-sensitized version that fully meets these requirements with the above-mentioned prior art.

Method used

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  • Support for lithographic printing plate and presensitized plate
  • Support for lithographic printing plate and presensitized plate
  • Support for lithographic printing plate and presensitized plate

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0259] (3) Preparation method of polymer compound forming the intermediate layer

[0260] The above-mentioned polymer compounds containing acid groups or both acid groups and onium groups used to form the intermediate layer can generally be prepared by free radical chain polymerization (see Textbook of Polymer Science by FWB Hillmeyer, 3rd edition (John Wiley & Sons, 1984)). These polymeric compounds may have a wide range of molecular weights, but the weight average molecular weight (Mw) measured by the light scattering technique is preferably 500-2,000,000, more preferably 2,000-600000. The amount of unreacted monomers present in the polymer compound can vary within a wide range, but it is preferably not more than 20 wt%, more preferably not more than 10 wt%. A general example of a polymer compound containing both an acid group and an onium group is a copolymer of p-vinylbenzoic acid and vinylbenzyltrimethylammonium chloride (No. 1 in Table 1 above). It can be synthesized by the ...

Embodiment 1 and comparative Embodiment 1

[0508] The thermosensitive layer (1) is a thermosensitive layer containing finely divided polymers, and its formation method is as follows:

[0509] The coating liquid for the heat-sensitive layer (1) having the following composition was coated on the lithographic printing plate supports 1 and 5 obtained above, and the coating amount during drying was 0.5g / m 2 , And then dry in an oven at 60°C for 150 seconds. Thus, the presensitized plates in Example 1 and Comparative Example 1 were obtained.

[0510] The composition of the coating liquid used for the heat-sensitive layer (1):

[0511] 5g (solid) liquid containing finely divided polymer synthesized above

[0512] Polyhydroxyethyl acrylate (weight average molecular weight is 0.5g

[0513] 25000)

[0514] Light-to-heat conversion material (the previous structural formula IR- 0.3g

[0515] 11)

[0516] Water 100g

Embodiment 2 and comparative Embodiment 2

[0518] The heat-sensitive layer (2) is a heat-sensitive layer containing microcapsules, and its formation method is as follows:

[0519] The coating liquid for the heat-sensitive layer (2) having the following composition was coated on the previously obtained lithographic printing plate supports 2 and 6, respectively, and the coating amount during drying was 0.7g / m 2 , And then dry in an oven at 60°C for 150 seconds. Thus, the presensitized plates in Example 2 and Comparative Example 2 were obtained. The composition of the coating liquid used for the heat-sensitive layer (2):

[0520] The microcapsule liquid prepared above 5g (solid)

[0521] Trimethylolpropane triacrylate 3g

[0522] Light-to-heat conversion material (formerly IR-11) 0.3g

[0523] Water 60g

[0524] 1-methoxy-2-propanol 40g

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Abstract

A support for a lithographic printing plate is composed of a metal base that has been grained and anodized then subjected to treatment with an aqueous solution containing an inorganic fluorine compound and a phosphate compound, followed or preceded by treatment with a silicate compound-containing aqueous solution, and an intermediate layer which lies on the treated metal base and contains an acid group-bearing polymeric compound. Presensitized plates composed in part of the support, when used as on-machine development type plates, have a good on-machine developability, high sensitivity, long press life and good resistance to scumming. When used as positive or negative-working thermal plates, such presensitized plates efficiently utilize heat in image formation, have a high sensitivity and a long press life, and minimize scumming in non-image areas.

Description

Technical field [0001] The present invention relates to a support for lithographic printing plates and a presensitized plate for lithographic printing. [0002] More specifically, the present invention relates to a pre-sensitized plate composed of a carrier with a thermal image recording layer thereon, which can be directly made into a lithographic printing plate through laser exposure scanned thereon without using film copy , And directly form text and images on its surface; the present invention also relates to a lithographic printing plate carrier used in the pre-sensitized plate. The present invention also relates to a heat-sensitive pre-sensitized plate that is highly suitable for computer printing plate systems that do not require development. The pre-sensitized plate can record images through infrared scanning exposure based on digital signals, and can be installed on a printing machine after exposure. It is directly printed after traditional processing steps involving the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/09B41N1/08B41N1/14B41N3/03G03F7/00G03F7/11
CPCB41N3/038B41N1/083
Inventor 堀田久
Owner FUJIFILM CORP
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