Patent · US Expired

Cyan coupler dispersion with improved stability

US5585230A · kind A · utility

5Cited by
18References
18Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMar 23, 1995
Grant dateDec 17, 1996
Priority date
Expiry dateMar 23, 2015

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG03C7/3885
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

Dispersions comprising particles of a phenolic cyan photographic coupler of Formula I dispersed in an aqueous gelatin solution substantially free of permanent organic solvent demonstrate improved stability to dispersion crystallization. ##STR1## R.sub.1 and R.sub.2 in Formula I each represent an aliphatic group, an aromatic group, or a heterocyclic group. R.sub.3 represents a hydrogen atom, a halogen atom, an aliphatic group, an aromatic group, an acylamino group, or a non-metallic atomic group necessary to form a nitrogen-containing 5-membered or 6-membered ring together with R.sub.2. X represents a hydrogen atom or a group capable of being released upon a coupling reaction with oxidation product of a developing agent, and n represents 0 or 1.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.