Color photographic recording material containing non-diffusing electron donor precursor compounds

US4366240A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Wolfgang Lassig · Munich, DE
• Ernst Meier · Munich, DE
• Siegfried Schleger

Key dates

• Filing date: Feb 17, 1981
• Grant date: Dec 28, 1982
• Expiry date: Feb 17, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C8/22
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

5- or 6-membered .alpha.-lactones of phenolic compounds, in which the phenyl ring carries a hydroxyl or amino group in its 2- or 4-position to the lactonized phenolic hydroxyl group and in which the lactone ring carries an electron accepting substituent, so that the lactone ring is readily cleavable at pH values of from 10 to 13 to form an electron donor compound (ED-compound) having a redox potential of less than +0.255 V determined against a normal calomel electrode at pH 0 are useful ED precursor compounds for non-diffusing reducible color providing compounds.