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Thermal positive-type planographic original printing plate and method of making planographic printing plate

A technology of lithographic printing plate and original plate, applied in lithographic printing equipment, printing surface preparation, printing, etc., can solve problems such as damage, poor durability, and poor chemical resistance

Inactive Publication Date: 2012-09-19
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this recording layer is also chemically weakened in the exposed areas, and thus tends to be poor not only in durability in normal printing, but also in chemical resistance, so that the recording layer becomes sensitive to ink cleaning solvents, plate cleaners, etc. sensitive to damage

Method used

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  • Thermal positive-type planographic original printing plate and method of making planographic printing plate
  • Thermal positive-type planographic original printing plate and method of making planographic printing plate
  • Thermal positive-type planographic original printing plate and method of making planographic printing plate

Examples

Experimental program
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preparation example Construction

[0033] (11) The method for producing a lithographic printing plate described in the above item (10), wherein the alkaline aqueous solution contains an anionic surfactant or a nonionic surfactant.

[0034] Hereinafter, the present invention will be described in detail.

[0035]

[0036] The lithographic printing plate precursor of the present invention contains (A) a star polymer in which at least 3 polymer chains are bound to atomic groups serving as nuclei and branched radially in at least one recording layer of an arbitrary number of layers provided on a support thereof, (B) Alkali-soluble resin and (C) infrared absorber. Herein, in the case where the recording layer has a configuration of two or more layers, each of the above-mentioned components (A) to (C) may be contained in the same layer, or contained in separate layers middle. The layer construction may be a single layer construction (see figure 2 ; the image-recording layer 1 is disposed on the carrier 4 with th...

Embodiment 2 and 4  *2  Embodiment 3

[0107] *1: Examples 2 and 4 below *2 Example 3 below

[0108]

[0109] In the case of a layered structure, the lower layer preferably contains the infrared absorber (C) described above. The lower layer may contain other components, if necessary, as long as they do not impair the effectiveness of the present invention. Examples of other components include (A) a star polymer, and (B) an alkali-soluble resin having a structure different from that of a novolac resin (this resin is referred to as "other alkali-soluble resin").

[0110] (Other Alkali Soluble Resins)

[0111] In the present invention, the term "alkali-soluble" means that the resin is soluble in an alkaline solution having a pH of 8.5 to 13.5 by the treatment of a standard development time. The other alkali-soluble resin used in the lower layer is not particularly limited, as long as the resin has a tendency to be dissolved when contacted with an alkaline developer. The resin preferably has acidic functional grou...

Embodiment 1

[0257] (Example 1, Comparative Example 1)··Printing plate precursor having a single recording layer

[0258]

[0259] The surface of the JIS A1050 aluminum plate was grained by rotating a nylon brush using a pumice-water suspension as an abrasive. Here, the surface roughness (center line average roughness) was 0.5 μm. After rinsing with water, the aluminum plate was immersed in a 10% aqueous solution of sodium hydroxide that had been heated to 70°C and etched so that the amount of dissolved aluminum was 6 g / m 3 . After rinsing with water, the board was immersed in a 30% nitric acid aqueous solution for 1 minute for neutralization, and was sufficiently rinsed with water. Afterwards, the aluminum plate was subjected to electrolytic roughening in 0.7% nitric acid aqueous solution for 20 seconds using a rectangular AC waveform voltage of 13 V anode voltage and 6 V cathode voltage, and was immersed in 20% sulfuric acid solution at 50 °C to rinse the surface , then rinse with w...

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Abstract

A thermal positive-type planographic original printing plate comprises a support and at least one recording layer provided on the support, either the same layer or different layers of the recording layer comprising: a star polymer in which at least 3 polymer chains bind to a core comprised atomic groups and are radially branching; and an infrared absorbing agent. The invention also provides a method of making planographic printing plate.

Description

technical field [0001] The present invention relates to a heat positive working lithographic printing plate precursor and a method for preparing a lithographic printing plate. Background technique [0002] Advances in technologies related to laser exposure and development in lithography have been astonishing. Especially for solid-state lasers and semiconductor lasers having emission regions in the range from near-infrared to infrared, high-power and compact lasers are readily available. Lasers are ideal for use as exposure sources in direct plate making using digital data from a computer, etc. Therefore, the development of lithographic printing masters with this type of platemaking is critical. [0003] A recording layer of a positive-working planographic printing plate precursor for an infrared laser contains an alkali-soluble binder resin, a dye that absorbs light to generate heat, and the like as main components. This IR dye or the like in the unexposed area (image are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/10B41N1/04B41N3/03G03F7/039
CPCB41C2201/14B41C1/1016B41C2210/02B41C1/1008B41C2201/04B41C2201/06B41C2201/10B41C2210/06B41C2210/14B41C2210/22B41C2210/24B41C2210/262B41C2210/266
Inventor 田口贵规大桥秀和
Owner FUJIFILM CORP
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