Lithographic printing plate precursor and process for producing lithographic printing plate

A technology for lithographic printing plates and production methods, which is applied in lithographic printing equipment, printing, printing technology, etc., can solve the problems of narrow development latitude and other problems, and achieve high printing resistance, good scratch resistance, and wide development latitude Effect

Inactive Publication Date: 2014-07-09
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this lithographic printing plate precursor has the following problems: especially for a developer whose pH is 12 or less, the development latitude is narrow, and the upper layer peels off during development and accumulates in the development tank, etc., and there is a need for further improvement in the development characteristics. room

Method used

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  • Lithographic printing plate precursor and process for producing lithographic printing plate
  • Lithographic printing plate precursor and process for producing lithographic printing plate
  • Lithographic printing plate precursor and process for producing lithographic printing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0171] Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to the scope of these examples.

Synthetic example 1

[0173] 29.1 g of 4,4'-diphenylmethane diisocyanate, 20.2 g of toluene-2,4-diisocyanate, and 6.3 g of neopentyl diisocyanate were introduced into a 500-ml round-bottomed three-necked flask equipped with a concentrator and a stirrer. Diol, 23.7 g of 2,2-bis(hydroxymethyl)propionic acid, 10.7 g of polyneopentyl glycol having a fluorine group represented by the structural formula shown below, and 270 g of 3-pentanone. 0.3 g of dibutyltin dilaurate was added, and it heated to 80 degreeC, stirring a reaction mixture. The reaction was continued at 80°C for 6 hours. Polyurethane (1) is thus obtained. The weight average molecular weight obtained by GPC was 22,000. The acid value is 110.

[0174] [chemical 13]

[0175] the

[0176] Polyneopentyl glycol having a fluorine group.

Synthetic example 2～11

[0178] Polyurethanes (2) to (11) were obtained in the same manner as in Synthesis Example 1 except that the diisocyanate and diol shown in Table 1 were used.

[0179] [Table 1-1]

[0180]

[0181]

[0182]

[0183]

[0184] .

[0185]

[0186] [Invention Example 1]

[0187]

[0188] The surface of the aluminum sheet is subjected to electrolytic surface roughening treatment with 2% hydrochloric acid. The average roughness Ra was 0.5 μm. Furthermore, anodic oxidation treatment was carried out in 20% sulfuric acid aqueous solution so that the amount of oxide film was 2.7g / m 2 . Then, the anodized aluminum sheet was immersed in a 2.5% by weight sodium silicate aqueous solution at 70° C. for 30 minutes, washed with water, and then dried.

[0189]

[0190] On the substrate obtained as above, the underlayer coating solution 1 shown in Table 2 was coated with a bar coater so that the coating weight was 1.4 g / m 2 , after drying at 135°C for 40 seconds, cooled t...

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Abstract

Provided is a lithographic printing plate precursor which shows satisfactory developability by a developing solution having a pH of 12 or less and which comes to have high printing durability and satisfactory scratch resistance and have improved ink receptibility. The lithographic printing plate precursor is a positive type precursor that comprises a base and, formed on the base, an image-forming layer comprising a resin which is insoluble in water and is soluble or dispersible in alkaline aqueous solutions, and that is characterized in that the image-forming layer comprises a lower layer and an upper layer and the resin in the lower layer and / or in the upper layer comprises a polyurethane including a unit which contains a substituent having an acidic hydrogen atom and a unit represented by general formula (I). (In the formula, Rf is an alkyl or polyether group in which at least 50% of the hydrogen atoms have been fluorinated, R1 is a hydrogen atom or an (un)substituted alkyl group, m is 0 or is 1-10, n is 1-30, and x is 1-4.)

Description

technical field [0001] The present invention relates to a lithographic printing plate precursor, in particular, to an infrared-sensitive or heat-sensitive lithographic printing plate precursor, and a method for making a lithographic printing plate, and the infrared-sensitive or heat-sensitive lithographic printing plate precursor can be used as a So-called computer-to-plate (CTP, computer to plate) that directly forms images by irradiating infrared rays from solid-state lasers or semiconductor lasers based on digital signals. Background technique [0002] In recent years, with the advancement of computer image processing technology, a method of directly writing an image on a photosensitive layer by irradiating a digital signal with radiation has been developed. This method is applied to a lithographic printing plate, and a computer-to-plate (CTP) system that forms an image directly on a lithographic printing plate precursor without performing output to a silver salt mask has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/095G03F7/00G03F7/004G03F7/039G03F7/32
CPCB41C1/1008B41C1/1016B41C2210/02B41C2210/06B41C2210/14B41C2210/266G03F7/095G03F7/322
Inventor 神谷昌道浅轮泰浩宫本靖油野丸早川英次
Owner EASTMAN KODAK CO
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