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Lithographic printing plate precursor, plate making method thereof and polyvalent isocyanate compound

A lithographic printing plate and isocyanate technology, which is applied in lithographic printing equipment, printing, printing technology, etc., can solve problems such as printing stains, insufficient printing durability, and poor developability

Active Publication Date: 2013-12-04
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in JP-A-2004-212558, Japanese Patent No. 2938397, JP-A-2000-211262, JP-A-2001-277740, JP-A-2002-29162, JP-A-2002-46361, JP-A -In hitherto known lithographic printing plate precursors described in 2002-137562 and JP-A-2002-326470, the printing durability of the image formed by laser exposure is insufficient and therefore additional improvement is required
In particular, it is difficult to obtain sufficient printing durability in images cured in recording materials capable of being recorded with infrared laser light having a photosensitive wavelength of 760 nm or more
In order to increase printing durability, when using a support with a surface with low hydrophilicity, ink also adheres to non-image areas during printing, resulting in printing smudges
Therefore, in recording materials capable of recording with infrared laser light having a photosensitive wavelength of 760 nm or more, it is a problem to obtain good stain resistance and sufficient printing durability
In particular, in on-press development using dampening water and / or printing ink, since developability is poor compared to a system including development with an alkaline developer, smudges tend to appear, making it more difficult to solve the problem

Method used

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  • Lithographic printing plate precursor, plate making method thereof and polyvalent isocyanate compound
  • Lithographic printing plate precursor, plate making method thereof and polyvalent isocyanate compound
  • Lithographic printing plate precursor, plate making method thereof and polyvalent isocyanate compound

Examples

Experimental program
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Effect test

preparation example Construction

[0070] [Preparation Method of Polymer Fine Particles]

[0071] The polymer fine particle according to the present invention is composed of a polymer obtained by a reaction between an isocyanate compound and a compound having an active hydrogen atom, and the isocyanate compound includes at least the polyvalent isocyanate compound according to the present invention. Therefore, the polymer fine particles according to the present invention can increase printing durability without concomitantly reducing developability.

[0072] The polymer fine particles according to the present invention can be obtained as in Asashi Kondo, Microcapsule , The Nikkan Kogyo Shimbun, Ltd. (1970) and Tamotsu Kondo et al., Microcapsules, It was prepared in the same manner as a hitherto known method for forming microcapsules described in detail in Sankyo Publishing Co., Ltd. (1977).

[0073] Polymer fines with polyurethane / polyurea walls or polyurethane walls were synthesized by interfacial polymeriz...

Embodiment

[0251] The present invention will be described in more detail with reference to the following examples, but the invention should not be construed as being limited thereto. In the examples, unless specifically stated otherwise, with respect to polymer compounds, the molecular weight is expressed as a weight average molecular weight (Mw) and the ratio of repeating units is expressed as a mole percent.

[0252] [Synthesis examples of polyvalent isocyanate adducts NCO-1 to NCO-21]

Synthetic example 1

[0253] Synthesis Example 1: Synthesis of NCO-1

[0254] In 470.7 g of ethyl acetate containing 355.6 g (1.60 mol) of isophorone diisocyanate ([PDI) and 169.6 g (0.40 mol) of polyhydric phenol compound P-2 having the structure shown below To the suspension, a solution containing 471 mg of tin octoate (STANOCT, manufactured by Yoshitomi Pharmaceutical Co., Ltd.) dissolved in 10 g of ethyl acetate was added dropwise over a period of one hour with stirring. After the dropwise addition was completed, stirring was continued for 2 hours and then stirred at 50° C. for 3 hours. Thus, a solution (concentration: 50% by weight) of polyvalent isocyanate adduct NCO-1 was obtained.

[0255] The terminal isocyanate compound obtained above was dibutyl-ureidized with dibutylamine to determine the weight average molecular weight (as calculated in polystyrene units) and its Mw was 24,400.

[0256] The obtained compound was identified by FT-IR (KBr). The data is shown below. FT-IR(KBr)3416cm...

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Abstract

To provide a lithographic printing plate precursor which is capable of undergoing image recording with infrared laser and exhibits high printing durability while maintaining stain resistance and preservation stability, and particularly, to provide a lithographic printing plate precursor capable of undergoing on-press development and a plate making method thereof, the invention is directed to a lithographic printing plate precursor comprising a hydrophilic support having thereon an image-recording layer containing (A) a polymer fine particle, (B) a radical polymerizable compound and (C) an infrared absorbing dye, wherein (A) the polymer fine particle is obtained by a reaction between a polyvalent isocyanate compound which is an adduct of a polyhydric phenol compound having two or more hydroxyl groups in its molecule and isophorone diisocyanate and a compound having an active hydrogen atom.

Description

technical field [0001] The present invention relates to a lithographic printing plate precursor capable of so-called direct plate-making in which direct plate-making is performed using various types of lasers based on digital signals such as from a computer, and in particular, relates to printing durability A lithographic printing plate precursor improved in properties, stain resistance, and storage stability, a plate-making method thereof, and a polyvalent isocyanate compound. Background technique [0002] Solid-state lasers, semiconductor lasers, and gas lasers that emit ultraviolet rays, visible light, or infrared rays having a wavelength of 300 to 1,200 nm having a large output and a small size become readily available, and these lasers are very usable for use based on, for example, data from a computer. Recording light source for data-to-plate. Various studies have been conducted on such various laser beam-sensitive recording materials. In particular, a recording mate...

Claims

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Application Information

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IPC IPC(8): G03F7/00B41N1/14G03F7/004G03F7/027G03F7/035
CPCB41C2210/22B41C2210/04B41C2210/08B41C2210/06B41C1/1008B41C1/1016B41C2201/02B41C2201/04B41C2201/10B41C2201/14B41C2210/10B41C2210/12B41C2210/20B41C2210/24
Inventor 青岛俊荣佐藤宪晃仓本守
Owner FUJIFILM CORP
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