Method of making lithographic aluminum offset printing plates

Radiation imagery chemistry: process – composition – or product th – Stripping process or element – Element

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430259, 430227, 430950, 430536, 430496, G03C 554, G03C 1112, G03C 190

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053626028

ABSTRACT:
Method for making lithographic aluminum offset printing plates according to the DTR-process by photo-exposing a photosensitive monosheet layer assemblage comprising a hydrophilic aluminum foil, an intermediate layer comprising hydrophobic polymer beads prepared by polymerization of ethylenically unsaturated monomer(s) and having an average diameter not lower than 0.2 .mu.m, and a silver halide emulsion layer, applying an aqueous alkaline solution to the photo-exposed silver halide emulsion layer in the presence of a developing agent and a silver halide solvent to form a silver image and to allow unreduced silver halide or complexes formed thereof to diffuse image-wise from the developed silver halide emulsion layer to said aluminum foil to produce thereon a silver image, and separating said emulsion layer and said intermediate layer from the imaged aluminum foil. The invention also relates to the photosensitive monosheet layer assemblage used for making such printing plates.

REFERENCES:
patent: 4614708 (1986-09-01), Timmerman et al.
patent: 5068165 (1991-11-01), Coppens et al.
patent: 5273858 (1993-12-01), Coppens et al.

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