Photographic recording material

US4301243A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Walter Puschel · Leverkusen, DE
• Heinrich Odenwalder · Leverkusen, DE
• Erwin Ranz · Leverkusen, DE

Key dates

• Filing date: Dec 12, 1979
• Grant date: Nov 17, 1981
• Expiry date: Dec 12, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C7/39208
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Traces of free inhibitors for the development of silver halide which might be present as impurities of inhibitor releasing compounds or which might be prematurely released therefrom because of insufficient stability thereof during storage of the photographic material are scavenged by compounds which are capable of binding free inhibitors at pH values below 7 but to a much less extent at pH values higher than 9.