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AssigneeMitsubishi Paper Mills Limited
InventorsEiji Kanada, Shoji Yamada, Yasuo Tsubai
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Lithographic printing plates having high ink receptivity, suffuring no ink stains and having much improved printing endurance can be produced by silver complex diffusion transfer process from lithographic printing plate materials comprising a support having thereon at least both silver halide emulsion layer and physical development nuclei layer wherein the diffusion transfer processing is carried out in the presence of 2-mercaptobenzoic acid derivatives or, besides this 2-mercaptobenzoic acid derivatives, at least one compound selected from the group consisting of alkanolamines and cyclic imide compounds which may be contained in at least one layers of the lithographic printing plate materials and/or the diffusion transfer developing solutions.
Method for making a lithographic printing plate which utilizes the transfer silver as ink receptive portions which is formed by silver complex diffusion transfer process from a lithographic printing plate material which comprises a support having thereon at least both silver halide emulsion layer and physical development nuclei layer by imagewise-exposure of the silver halide emulsion layer and diffusion transfer development thereof with an alkaline processing solution, characterized in that diffusion transfer development processing is carried out in the presence of 2-mercaptobenzoic acid derivative.
Lithographic printing plate material which comprises a support having thereon at least both silver halide emulsion layer and physical development nuclei layer, characterized in that 2-mercaptobenzoic acid derivative is contained in at least one of the constituting layers.
Dependencies are inferred from the claim text.