Sterically hindered aromatic carboxylic esters

Details Sterically hindered aromatic carboxylic esters Sterically hindered aromatic carboxylic esters

1987-01-12

1989-05-02

Lone, Werren B.

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

Organic compounds

Carboxylic acid esters

430546, 546301, 548491, 548556, 549 79, 549491, 560 76, 560 83, 560 85, 560 86, C07C 6980, C07D21378, C07D20904, C07D30702

Patent

active

048270199

ABSTRACT:
Photographic coupler solvents comprising aromatic carboxylic esters such as phthalates and isophthalates having bulky or branched ester substituents are described for incorporation in photographic emulsions and elements. The solvents are preferably employed in the cyan layer to protect the cyan dye against ferrous ion reduction. The solvents also provide improvements in yellow dye stability to light, cyan dye stability in the dark and magenta dye stability to heat and light.

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