Lithographic printing plate precursor, lithographic printing method and packaged body of lithographic printing plate precursors

a technology precursor, which is applied in the field packaged body of lithographic printing plate precursor, can solve the problems of insufficient press life, weak image strength, and error in operation, and achieve good visibility of printing plate, good on-press developability and press life, and good paper loss

Inactive Publication Date: 2011-06-09
MITSUMOTO TOMOYOSHI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0342]Infrared absorbers may be used alone, or two or more kinds may be used in combination. In addition, general purpose infrared absorbers having an oxidation potential exceeding 0.45 V (vs. SCE) can be used in combination within the range of not impairing the effect of the invention. In this case, the content of the general purpose infrared absorbers is preferably 40 mass % or less in all the solids content of the infrared absorbers.

Problems solved by technology

However, although a method of forming an image by coalescence of fine particles by mere heat fusion as above certainly shows good on-press developability, there are problems that image strength is weak and press life is insufficient.
However, since there is no image on a printing plate in a lithographic printing plate precursor of an on-press development type or a non-processing (non-development) type not accompanied by development process before printing, the discrimination of a plate cannot be done, which sometimes leads to the error in operation.
However, although the inspection work becomes easy by using in an image-recording layer the combination of a leuco dyestuff with a color developer or the combination of a light-acid generator with a pH indicator as the specific examples of the discoloring compound disclosed in JP-A-11-277927, drawbacks arise such that paper loss increases and printing performances are adversely influenced such that soiling resistance and press life are deteriorated, since a compound that does not concern image formation must be added for generating discoloration.
However, with an on-press development type lithographic printing plate precursor, such a great amount of a protective layer causes the problems of delay of on-press development, mixing of removed substances in a fountain solution, and accumulation on an impression drum, so that a protective layer capable of exhibiting the same function as conventional protective layers is required.
Therefore, there is a problem in U.S. Patent Application 2003 / 0,064,318A1 that the image-forming property is rather hindered by coating the protective layer and sensitivity is reduced.
However, if polymerization reaction is applied to lithographic printing plate precursors that do not necessitate development process, the lithographic printing plate precursors are adhered to each other when they are laminated without using interleaving sheets, since the content of soft polymerizable compound accounting for in a photosensitive composition is high, and the image-recording layer or the protective layer is scratched, and aging stability and press life are deteriorated.

Method used

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  • Lithographic printing plate precursor, lithographic printing method and packaged body of lithographic printing plate precursors
  • Lithographic printing plate precursor, lithographic printing method and packaged body of lithographic printing plate precursors
  • Lithographic printing plate precursor, lithographic printing method and packaged body of lithographic printing plate precursors

Examples

Experimental program
Comparison scheme
Effect test

example 1

(1) Manufacture of Lithographic Printing Plate Precursor

[0508]The image-recording layer coating solution (1) having the composition shown below was coated on support B with bar coating, dried at 100° C. for 60 seconds in an oven to form an image-recording layer having a dry coating weight of 1.0 g / m2, whereby lithographic printing plate precursor (1) was obtained. The central line average roughness (Ra) of the surface of the lithographic printing plate precursor having the image recording layer measured with a needle having a diameter of 2 μm was 0.40 μm, and the surface roughness of the side opposite to the side on which the image-recording layer was coated was 0.25 μm.

Image-Recording Layer Coating Solution (1):

[0509]

 Binder polymer (1)0.162 gPolymerization initiator (1)0.100 gInfrared absorber (1)0.030 gPolymerizable compound, Aronix M-2150.385 g(manufactured by Toa Gosei Co., Ltd.)Fluorine surfactant (1)0.044 gInorganic layered compound dispersion (1)3.125 gprepared as followsMet...

example 2

[0513]The image-recording layer coating solution (2) having the composition shown below was coated on the same support B as in Example 1 with bar coating, dried at 100° C. for 60 seconds in the oven to form an image-recording layer having a dry coating weight of 1.0 g / m2. Subsequently, the protective layer coating solution (1) having the composition shown below was coated on the above image-recording layer with wire bar coating and dried at 120° C. for 60 seconds in the oven, whereby lithographic printing plate precursor (2) with a protective layer having a dry coating weight of 0.20 g / m2 was obtained. The central line average roughness (Ra) of the surface of the lithographic printing plate precursor having the protective layer measured with a needle having a diameter of 2 μm was 0.28 μm, and the surface roughness of the side opposite to the image-recording layer was 0.25 μm. The obtained lithographic printing plate precursors were made a packaged body according to the same manner a...

example 3

[0516]Lithographic printing plate precursor (3) was manufactured in the same manner as in Example 2, except that the dry coating weight of the protective layer was changed from 0.20 g / m2 to 1.0 g / m2. The central line average roughness (Ra) of the surface of the lithographic printing plate precursor having the protective layer measured with a needle having a diameter of 2 nm was 0.20 nm, and the surface roughness of the side opposite to the image-recording layer was 0.25 nm. The obtained lithographic printing plate precursors were made a packaged body according to the same manner as in Example 1.

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Abstract

(1) A packaged body of lithographic printing plate precursors, wherein an image-recording layer or a protective layer of the outermost surface layer contains an inorganic layered compound. (2) A lithographic printing plate precursor having a protective layer containing an inorganic layered compound, and an image-recording layer containing a binder polymer. (3) A lithographic printing plate precursor having a protective layer containing an inorganic layered compound, and an image-recording layer containing an infrared absorber and an iodonium compound.

Description

[0001]This application is a Divisional of co-pending U.S. application Ser. No. 11 / 339,447 filed Jan. 26, 2006, which claims the benefit of priority of JP 2005-018195, filed Jan. 26, 2005, JP 2005-022650, filed Jan. 31, 2005, JP 2005-068924, filed Mar. 11, 2005, JP 2005-219200, filed Jul. 28, 2005 and JP 2005-221594, filed Jul. 29, 2005. The entire content of each of the above-identified applications is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a lithographic printing plate precursor and a packaged body of the lithographic printing plate precursors. More specifically, the invention relates to a lithographic printing plate precursor capable of direct plate making by scanning with laser beams on the basis of digital signals such as computer data, and a packaged body of the lithographic printing plate precursors.[0004]2. Description of the Related Art[0005]A lithographic printing plate generally comp...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): G03B27/32G03C1/00
CPCB41C1/1008B41C2210/24B41M5/465B41N1/08B41N1/14G03F7/0012G03F7/002G03F7/11B41C2201/02B41C2201/04B41C2201/06B41C2201/10B41C2201/12B41C2201/14B41C2210/04B41C2210/08B41C2210/20B41C2210/22B41C1/1016
InventorMITSUMOTO, TOMOYOSHIOSHIMA, YASUHITO
OwnerMITSUMOTO TOMOYOSHI