Photographic products and processes employing triarylmethane com

Details Photographic products and processes employing triarylmethane com Photographic products and processes employing triarylmethane com

1980-05-22

1981-12-08

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, 430383, 430390, 430520, 430434, 430446, 430448, 430505, G03C 140, G03C 184, G03C 110, G03C 554

Patent

active

043048331

ABSTRACT:
The present invention is concerned with photographic products and processes, particularly diffusion transfer products and processes employing certain colored triarylmethane compounds possessing in their triaryl structure a 4'-oxo-1'-naphthylidene (or a 4'-oxo-1'-phenylidene) moiety, a naphthyl (or phenyl moiety) and a phenyl moiety substituted in the ortho-position to the central carbon atom with a non-nucleophilic group that cannot add to the central carbon atom but in alkaline solution undergoes an irreversible cleavage reaction with base that is complete within a predetermined time at a predetermined alkaline pH to provide a nucleophilic moiety that adds to the central carbon atom to form a ring-closed compound which is colorless.

REFERENCES:
patent: 1879537 (1932-09-01), Schneider
patent: 1994876 (1935-03-01), Schneider et al.
patent: 2350090 (1944-05-01), Beilenson
patent: 3005711 (1961-10-01), Burgardt et al.
patent: 3406069 (1968-10-01), Overman
patent: 4139381 (1979-02-01), Bloom et al.

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