Dye diffusion transfer process employing compounds that release sulfonamide dye providing radicals

US4198235A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Hans Vetter · Kempten (Allgäu), DE
• Walter Puschel · Leverkusen, DE
• Arnfried Melzer · Cologne, DE
• Manfred Peters · Bad Schwartau, DE

Key dates

• Filing date: Jun 21, 1978
• Grant date: Apr 15, 1980
• Expiry date: Jun 21, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C8/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Useful non-diffusible dye-giving compounds for the photographic dye diffusion transfer process are dye sulfonamides derived from enolamines or endiamines or tautomers thereof. The dye-giving compounds are oxidized by developer oxidation products and subsequently split under the conditions of alkaline development to release diffusible dyes. The compounds are of the following formula ##STR1## in which X is a dye moiety and R.sub.1, R.sub.2 and R.sub.3 have meanings given hereinafter.