Method for making a lithographic offset plate by the silver salt diffusion transfer process

US5405729A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Paul Coppens · Turnhout, BE
• Ludovicus H. Vervloet · Kessel, BE
• Augustin Meisters · Gentbrugge, BE
• Jean-Pierre Tahon · Langdorp, BE

Key dates

• Filing date: Feb 1, 1994
• Grant date: Apr 11, 1995
• Expiry date: Feb 1, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G03F7/32
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The present invention provides a method for making an offset printing plate according to the silver salt diffusion transfer process using rinsing water, characterized in that said rinsing water before washing at most 20 m.sup.2 of said exposed and developed imaging element and/or before being in use for more than 24 hours is brought in contact with (i) a metal of the group IB or IIB or VIII of the periodic table or (ii) with an alloy containing at least one of said metals or (iii) with a salt containing an ion of at least one of said metals.