Color photographic materials containing diffusion fast pyrazolone couplers

US3973979A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Ernst Meier · Munich, DE
• Hans Glockner
• Karl Kuffner · Unterhaching, DE
• Immo Boie · Cologne, DE
• Karl-Wilhelm Schranz · Langenfeld, DE

Key dates

• Filing date: May 14, 1974
• Grant date: Aug 10, 1976
• Expiry date: May 14, 1994

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C7/3212
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Improved 5-pyrazolone couplers of the following formula ##SPC1## wherein R,R.sub.1 R.sub.2,X and A denotes as described hereinafter for use in lightsensitive color photographic materials which are easy to prepare and give rise after chromogenic development to magenta dyes with improved stability to light.