2-Equivalent yellow couplers

Details 2-Equivalent yellow couplers 2-Equivalent yellow couplers

1977-05-06

1979-01-09

Raymond, Richard

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

96 565, 96100N, 544139, 548305, 548318, C07D23370

Patent

active

041339584

ABSTRACT:
Desirable 2-equivalent yellow-forming couplers in which a 1,3-diazolone-2-ring as splittable group is attached by the nitrogen in its 1-position to the coupling position of the 2-equivalent yellow-forming coupler and in which the diazolone ring has a C.dbd.C double bond adjacent to the nitrogen atom in its 1-position, have improved photographic properties in particular with respect to improved reactivity on chromogenic development and improved stability of the couplers as well as the dyes produced from them on chromogenic development in a photographic material which has been subjected to storage under moist and/or warm conditions.

REFERENCES:
patent: 3265506 (1966-08-01), Weissberger et al.
patent: 4026706 (1977-05-01), Nakamura et al.
Neblette, Photography, Its Materials and Processes, D. Van Nostrand Co., New York (1962) p. 241-246.

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