C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
96/185, 96/32, 2
C09B 57/00 (2006.01) C07D 311/82 (2006.01) C09B 11/28 (2006.01) G03C 1/10 (2006.01) G03C 1/83 (2006.01) G03C 8/48 (2006.01)
Patent
CA 1160640
Abstract of the Disclosure In one embodiment, the present invention is concerned with novel xanthene compounds selected from those of the formulae Image and Image wherein each R1 the same or different is alkyl, each R2 the same or different is an electron-withdrawing group having a positive sigma value qreater than 0.6, X is Image Image , or - wherein R3 is alkyl, Y is an electron-withdrawing group, n is 0 or 1 and A is an anion. In another embodiment, the present invention is concerned with photographic products and processes employing these xanthene compounds, e.g., as photographic light-screening dyes.
367480
Cournoyer Richard L.
Foley James W.
Polaroid Corporation
Smart & Biggar
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