Water-developable photopolymerization type lithographic printing material containing two photosensitive layers and application thereof

Abstract

The invention discloses a water-developable photopolymerization type lithographic printing material containing two photosensitive layers and an application thereof. The material comprises a support body, a photosensitive hydrophilic bottom layer and an oleophilic photosensitive layer, wherein the photosensitive hydrophilic bottom layer is arranged on the support body and comprises 50 to 99 parts of water soluble resin by mass, 0 to 49 parts of hydrophilic thinners by mass and 1 to 50 parts of hydrophilic polymerization initiating systems by mass, and the oleophilic photosensitive layer is arranged on the photosensitive hydrophilic bottom layer and comprises 10 to 60 parts of film forming resin by mass, 30 to 90 parts of crosslinking agents by mass, 0 to 40 parts of thinners by mass, 0.1 to 30 parts of polymerization initiating systems by mass and 0.1 to 10 parts of background coloring dye by mass. The lithographic printing material is suitable for exposure in laser with 350 mm to 450 mm of wavelength, is a photosensitive lithographic printing plate with high sensitivity and high pressrun in a CTP mode and can be developed with water or with a fountain solution on a printing machine.

Description

technical field [0001] The present invention relates to photosensitive lithographic printing plates. More specifically, it relates to a water-developable photopolymerizable lithographic printing plate material comprising two photosensitive layers for computer-to-plate technology and its application. Background technique [0002] In recent years, relying on digital technology to electronically process, store and output graphic and text information by computer has prevailed, and CTP technology is one of them that has attracted much attention. CTP technology is a technology that uses highly directional light such as laser to scan according to digital image information, and directly manufactures printing plates. CTP plates are generally divided into three types: silver salt type, photopolymerization type, and thermal imaging type (heat sensitive). Since the launch of the Drupa2000 violet laser diode, the violet laser CTP technology has developed rapidly. The wavelength of the ...

AI Technical Summary

Problems solved by technology

The hydrophilic photosensitive bottom layer usually uses a photosensitive composition based on aromatic diazo compounds. The disadvantage of this type of printing plate is that the addition of diazo compounds can easily cause dirty plates and pollute printing machines. The relevant patents that can be listed There are U.S. Patent Nos. 4,600,679 and 4,104,072; therefore, there is still room for improvement when these inventions meet the two requirements of preventing smudges under various printing conditions (that is, good developing performance) and high printing force

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