Novel xanthene compounds and their photographic use

Details Novel xanthene compounds and their photographic use Novel xanthene compounds and their photographic use

1982-12-28

1983-11-22

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Diffusion transfer process, element, or identified image...

430227, 430228, 430236, 430244, 430245, 430359, 430375, 430383, 430391, 430446, 430505, 430507, 430517, 430520, G03C 700, G03C 140, G03C 184, G03C 554

Patent

active

044169710

ABSTRACT:
In one embodiment, the present invention is concerned with novel xanthene compounds of the formula ##STR1## wherein each R.sup.1 is the same and is selected from ##STR2## R.sup.2 is alkyl, R.sup.3 is an electron-withdrawing group positioned ortho, meta or para to said N atom, R.sup.4 is hydrogen, alkyl or an electron-withdrawing group positioned ortho, meta or para to said N atom; R.sup.5 is alkyl; X is hydrogen, an electron-withdrawing group or an electron-donating group; 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.

REFERENCES:
patent: 1879537 (1932-09-01), Schneider
patent: 1994876 (1935-03-01), Schneider et al.
patent: 2182794 (1939-12-01), Dawson
patent: 2203767 (1940-06-01), Baldsiefen
patent: 2203768 (1940-06-01), Baldsiefen
patent: 2350090 (1944-12-01), Dawson
patent: 3005711 (1961-10-01), Burgardt et al.
patent: 3406069 (1968-10-01), Overman
patent: 3615548 (1971-10-01), Firestine
patent: 4258118 (1981-03-01), Foley et al.
patent: 4304834 (1981-12-01), Cournoyer et al.
Beilstein's Handbuch der Organischen Chemie, vol. 27, p. 534.

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