Process for the production of color photographic images using new white coupler substances

US4204867A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Karl Kuffner · Unterhaching, DE
• Wolfgang Lassig · Munich, DE
• Ernst Meier · Munich, DE
• Immo Boie · Cologne, DE
• Gertrud Kirchhoff · Leverkusen, DE
• Helmut Haseler · Leverkusen, DE
• Herbert Stark · Kelkheim, DE

Key dates

• Filing date: Feb 10, 1978
• Grant date: May 27, 1980
• Expiry date: Feb 10, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C7/421
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

White couplers which are capable of reacting with color developer oxidation products to form colorless end product with the consumption of four oxidation equivalents and which, therefore have increased absorption capacity for color developer oxidation products correspond to the formula ##STR1## or its tautomeric form, in which R.sup.1 is hydrocarbyl, heterocyclyl attached through a ring carbon, or --CO--R.sup.2 R.sup.2 is alkyl, aryl, alkoxy, amino X is --S-- or --NR.sup.3 -- R.sup.3 is hydrogen, same as represented by R.sup.1 or an electron-attaching group. The four-equivalent white couplers may be contained in processing solutions or, in diffusion resistant form, in one or more layers of a colorphotographic material.