On April 22, 1987, Tanaka, Shigeo; Nakamura, Shinichi; Ohayashi, Keiji published a patent.COA of Formula: C31H54O3 The title of the patent was Silver halide color photographic material. And the patent contained the following:
A Ag halide color photog. material is obtained with ≥1 Ag halide emulsion layer containing a cyan coupler of the formula I [R1 = alkyl, aryl; R2 = alkyl, cycloalkyl, aryl, heterocyclyl; R3 = H, alkyl, alkoxy; R1 and R3 may join to form a 6-membered ring; Z1 = H, a group released on coupling] and ≥1 compound selected from II [R4 = alkyl; R5 = ≥4 C alkyl, XCO2R6, XA, YA2 (R6 = ≥4 C alkyl, aralkyl, aryl, A = 2,5-alkyl-substituted 4-hydroxyphenyl; X = divalent organic moiety as C-C single bond; Y = trivalent organic)] melting at ≥60°. Optionally, a cyan coupler, (III; R7 = diffusion-resisting group; R8 = C1-4 alkyl; Z2 = H, a group releasable on coupling) is also incorporated. The material shows superior dark fading properties and black reproducibility. The experimental process involved the reaction of Octadecyl 3-(3-(tert-butyl)-4-hydroxyphenyl)propanoate(cas: 110729-26-5).COA of Formula: C31H54O3
The Article related to color film dark fading, black reproducibility photog film, cyan coupler photog film, Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes: Silver Halide Photographic Chemistry and Processes and other aspects.COA of Formula: C31H54O3
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