Photographic products and processes with a pH sensitive xanthene

Details Photographic products and processes with a pH sensitive xanthene Photographic products and processes with a pH sensitive xanthene

1980-10-06

1982-08-17

Kittle, John E.

Radiation imagery chemistry: process, composition, or product th

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

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

430376, 430503, 430504, 430513, 430543, 430955, G03C 700, G03C 1400, G03C 184, G03C 554

Patent

active

043450172

ABSTRACT:
The present invention is concerned with photographic products and processes employing certain pH-sensitive xanthene compounds as light-screening dyes, which compounds may be represented by the formulae ##STR1## wherein A and A', the same or different, are selected from ##STR2## each R is hydrogen or an electron-withdrawing group; each R.sup.1 is hydrogen or alkyl; each R.sup.2 is hydrogen, alkyl or an electron-withdrawing group; R.sup.3 is hydrogen or alkyl; R.sup.4 is alkyl; and n is 0 or 1 and which compounds in their colored, i.e., ring-opened form may be represented by the formulae ##STR3## wherein A, A', R.sup.3, R.sup.4 and n have the same meaning given above and Z is an anion.

REFERENCES:
patent: 1879537 (1932-09-01), Schneider
patent: 1944876 (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 (1944-05-01), Beilenson
patent: 3005711 (1961-10-01), Burgardt
patent: 3406069 (1968-10-01), De Witt Overman
patent: 3615548 (1971-10-01), Firestine
patent: 4139381 (1979-02-01), Bloom et al.
Beilstein's Hanbuch der Organischem Chemie, vol. 27, p. 534.

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