Platemaking process with heat developable silver salt diffusion

Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...

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Details

430204, 430206, G03C 840, G03C 852, G03F 707

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active

057006229

ABSTRACT:
A process for simply and rapidly producing a lithographic printing plate is disclosed, which comprises image-wise exposing a silver halide photosensitive material comprising a substantially water-insoluble basic metal compound and optionally having a physical-development nucleus layer on the external surface thereof, superposing the silver halide photosensitive material either after or simultaneously with the image-wise exposure on an image-receiving material which contains a complex-forming compound and has a physical-development nucleus layer on the external surface thereof or on a sheet which contains a complex-forming compound, in such a manner that the coating side of the photosensitive material is in contact with the coating side of the image-receiving material or the sheet, heating the superposed materials in the presence of a reducing agent and water, and subsequently separating both materials from each other to form a silver image as an ink-receptive area on the physical-development nucleus layer by means of silver salt diffusion transfer. The printing plate of the present invention has improved impression capacity.

REFERENCES:
patent: 3220837 (1965-11-01), Land et al.
patent: 3438776 (1969-04-01), Yudelson
patent: 3490905 (1970-01-01), Blake
patent: 3721559 (1973-03-01), De Haes et al.
patent: 4639407 (1987-01-01), Aono
patent: 4740445 (1988-04-01), Hirai et al.
patent: 4876171 (1989-10-01), Hirai

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