Photographic elements containing specified cyan dye-forming couplers for improved heat and light stability

Abstract

The invention provides a photographic element comprising a silver halide emulsion layer having associated therewith a cyan dye-forming coupler having the formula: wherein R.sub.3 represents a methyl or ethyl group; R.sub.4 represents an alkyl or alkenyl group containing 8 or more carbon atoms; R.sub.5 represents an alkyl or alkenyl group containing 4 or more carbon atoms; X represents a chloro or fluoro group; Y represents a substituent group and n represents an integer from 0 to 4, provided that if n is 2 or more, then two Y groups may be joined together to form a ring; and Z represents hydrogen or a group capable of being split off by oxidized color developer. The dye formed by the coupler upon conventional processing with a p-phenylenediamine developer exhibits improved stability.

Dependencies are inferred from the claim text.