Process for the preparation of silver dispersions for filter layers and antihalation layers

US4094811A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Artur Botta · Krefeld, DE
• Anita von Konig · Krefeld, DE
• Franz Moll · Leverkusen, DE
• Christian Rasp · Cologne, DE
• Johannes Hartl

Key dates

• Filing date: Dec 21, 1976
• Grant date: Jun 13, 1978
• Expiry date: Dec 21, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/8255
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The process for the preparation of silver dispersions for antihalation and filter layers in photographic material by reducing silver salts in the presence of a heterocyclic 5-membered or 6-membered compound which has a ##STR1## group in its 1,2,3-position and a 2-aminoalkyl or 2-hydroxyalkyl group or an alkylene chain which is linked through the 1- and 2-position. The process provides neutral grey silver dispersions without using cadmium salts, for the reduction of the silver salts.