Light-sensitive photographic material

US4183752A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Karl Kuffner · Unterhaching, DE
• Wolfgang Lassig · Munich, DE
• Ernst Meier · Munich, DE
• Erwin Ranz · Leverkusen, DE
• Karl-Wilhelm Schranz · Langenfeld, DE

Key dates

• Filing date: Feb 16, 1978
• Grant date: Jan 15, 1980
• Expiry date: Feb 16, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/158
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Development inhibitor releasing compounds are thioether compounds capable of releasing on reaction with color developer oxidation products, a diffusible mercaptan that inhibits further development of silver halide. Useful DIR compounds correspond to the formula ##STR1## R.sup.1 represents hydrocarbyl Y represents --S-- or --NR.sup.2 -- PA1 R.sup.2 represents hydrogen, hydrocarbyl or an electron-attracting substituent. PA1 X in its preferred embodiment represents a heteroaromatic group that when split of together with the sulfur atoms forms a silver halide development inhibiting mercaptane.