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Lithographic printing plate precursor

A lithographic printing plate, printing plate technology, applied in the direction of lithographic printing equipment, printing, printing process, etc., can solve problems such as contrast reduction, contrast fading, low contrast, etc.

Active Publication Date: 2021-08-24
易客发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] A problem associated with prior art materials is that the printed image obtained after exposure is often characterized by only low contrast between exposed and unexposed areas, requiring high exposure energy to create contrast and / or require high levels of leuco dye
Furthermore, the contrast achieved often fades over time when the exposed plate is not immediately used in the print job
In other words, during processing and / or storage e.g. in office light, the obtained contrast is often reduced

Method used

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Experimental program
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Embodiment

[0337] 1. Preparation of comparative printing plate precursors PP-01, PP-02 and PP-05, and printing plate precursors PP-03, PP-04 and PP-06 of the present invention.

[0338] Preparation of Aluminum Support S-01

[0339] A 0.3 mm thick aluminum foil was degreased by spraying with an aqueous solution containing 26 g / l NaOH at 65 °C for 2 s and rinsed with demineralized water for 1.5 s. Then at a temperature of 37°C and about 100 A / dm 2 At a current density of 15 g / l HCl, 15 g / l SO 4 2- ions and 5 g / l Al 3+The foil was electrochemically roughened within 10 seconds using an alternating current in an aqueous solution of ions. The aluminum foil was then desmeared by etching with an aqueous solution containing 5.5 g / l NaOH for 2 s at 36°C and rinsed with demineralized water for 2 s. Then at a temperature of 50°C and 17 A / dm 2 The foils were anodized in an aqueous solution containing 145 g / l sulfuric acid at a current density of 15 s, washed with demineralized water for 11 s an...

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Abstract

A lithographic printing plate precursor is disclosed including a support and a coating including a polymerisable compound, an optionally substituted trihaloalkyl sulfone initiator, a leuco dye and a specific infrared absorbing compound including a six membered ring in the central position.

Description

technical field [0001] The present invention relates to novel lithographic printing plate precursors. Background technique [0002] Lithographic printing generally involves the use of so-called printing masters, such as printing plates mounted on the cylinders of a rotary printing press. The master bears a lithographic image on its surface and the print is obtained by applying ink to said image and then transferring the ink from the master to a receiving material, usually paper. In conventional lithographic printing, ink is supplied to a planographic image, along with an aqueous fountain solution (also called fountain solution), which consists of oleophilic (or hydrophobic, i.e. accepts ink, repels water) areas and hydrophilic ( Or oleophobic (that is, accept water, repel ink) area composition. In so-called dry offset printing, the lithographic image consists of ink-accepting areas and ink-repelling (ink-repelling) areas, and in the dry offset process only ink is supplied ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/10
CPCB41C1/1008B41C1/1016B41C2210/04B41C2210/06B41C2210/08B41C2210/22
Inventor E·多姆K·德莫斯J·罗库费尔
Owner 易客发有限公司