Color photographic material with improved color reproduction

US4156608A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Hans Vetter · Kempten (Allgäu), DE
• Walter Puschel · Leverkusen, DE
• Rigobert Otto · Leverkusen, DE

Key dates

• Filing date: May 2, 1977
• Grant date: May 29, 1979
• Expiry date: May 2, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C7/18
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Suitable masking compounds for masking the undesired color side densities of image dyes produced from color couplers are those of the following formula ##STR1## in which R.sup.1 represents hydrogen or one or more substituents such as halogen, alkyl, aryl, a heterocyclic group alkoxy, hydroxyl, amino, acylamino, sulfo, sulfonyl, carboxyl or carbamyl or condensed carbocyclic or heterocyclic ring. PA1 R.sup.2 represents alkyl, aryl, a heterocyclic group carboxyl or esters or amide derived from carboxyl PA1 X represents a dye group optionally containing a solubilizing group. On development with black-and-white or color-forming developers the dye group is released imagewise and is removed by aqueous processing baths leaving back a positive color or masking image.