Lithographic printing plate master and plate making method using the same
A technology of lithographic printing plates and original plates, which is applied in the field of plate making of lithographic printing original plates, can solve the problems of printing durability, stain resistance degradation, and loss of adhesion, and achieve high productivity, good printing durability, and high sensitivity. Effect
Inactive Publication Date: 2013-06-05
FUJIFILM CORP
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Problems solved by technology
[0006] However, regarding the lithographic printing plate precursor proposed in Patent Document 4, since the hydrophilic polymer used in the undercoat layer is a copolymer containing both: (1) repeating functional groups capable of interacting with the surface of the support Unit, (2) a repeating unit having a hydrophilic group for exhibiting hydrophilicity in the non-image area and (3) a repeating unit having an ethylenically unsaturated bond for adhering the image area, when ( When 1) and (2) are increased in order to improve stain resistance and printing durability, (3) is decreased so that loss of adhesion between the support and the undercoat layer occurs to cause deterioration of both printing durability and stain resistance Shortcomings
Method used
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Embodiment 1 to 35 and comparative example 1 to 28
[0324] 1. Preparation of lithographic printing plate precursors (1) to (29)
[0325] (1) Preparation of carrier
[0326] An aluminum plate (material: JIS A1050) 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 a 25% by weight aqueous sodium hydroxide solution at 45°C for 9 seconds, washing with water, then dipping in a 20% by weight nitric acid solution at 60°C for 20 seconds, and washing with water. The amount of etching on the grained surface is about 3g / m 2 .
[0327] Then, the electrochemical roughening treatment was continuously performed on the plate using an alternating current of 60 Hz. ...
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Abstract
A lithographic printing plate master, and plate making method using the same, that enable plates to be made directly from digital data of devices such as computers by printing using a laser beam, and specifically enable development on a printer, have superior developability, and are highly sensitive, with satisfactory plate durability and dirt resistance. The lithographic printing plate master has a support member, an undercoat layer, and an image recording layer, in that order, and enables deletion of an unexposed section by supplying printing ink after image exposure on the image recording layer, the image recording layer containing (A) a polymerization initiator, (B) a polymeric compound, and (C) a binder polymer, characterized in that the undercoat layer contains a copolymer (D1) having (a1) repeating units with a zwitterion structure, and (a2) repeating units with a structure that is congruent with the support body surface, and a copolymer (D2) having (a3) repeating units with ethylenically unsaturated bonds, and (a2) repeating units with a structure that is congruent with the support body surface, the weight of the copolymer (D1) being 5 to 95% with respect to the total weight of the copolymers (D1) and (D2).
Description
technical field [0001] The present invention relates to a lithographic printing plate precursor and a plate making method using the same, and in particular, to a lithographic printing plate precursor suitable for on-press development and a plate making method using the lithographic printing plate precursor. Background technique [0002] Regarding hitherto known lithographic printing plate precursors (hereinafter, also referred to as PS plates), since a step of removing non-image areas by dissolution with a strong alkali (development treatment) after image exposure is performed, post-processing steps such as printing Washing of plates with water after development treatment, treatment of printing plates with rinse solutions containing surfactants after development treatment or treatment of printing plates with oil-desensitizing solutions containing gum arabic or starch derivatives after development treatment ) processing is necessary. The fact that these additional wet treatm...
Claims
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IPC IPC(8): B41N1/14G03F7/00G03F7/027G03F7/11
CPCG03F7/09G03F7/26B41C1/1016B41C2201/04G03F7/033G03F7/11G03F7/3035B41C2201/02B41C2201/06B41C2201/10B41C2201/14B41C2210/04B41C2210/08B41C2210/22B41C2210/24
Inventor 佐藤尚志阿部纯也岩井悠
Owner FUJIFILM CORP