Method of making lithographic aluminum offset printing plates

US5273858A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Paul Coppens · Turnhout, BE
• Joan Vermeersch · Deinze, BE
• Luc Leenders · Herentals, BE
• Ludovicus H. Vervloet · Kessel, BE
• Eric Hoes · Lille, BE
• Eddie Daems · Herentals, BE

Key dates

• Filing date: Oct 28, 1991
• Grant date: Dec 28, 1993
• Expiry date: Oct 28, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/151
• WIPO field: Optics
• WIPO sector: Instruments

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 imagewise 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.