Recording material containing chromogenic 3,3-bisindolyl-4-azaph

Details Recording material containing chromogenic 3,3-bisindolyl-4-azaph Recording material containing chromogenic 3,3-bisindolyl-4-azaph

1985-12-16

1987-11-10

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

Having a colorless color-former, developer therefor, or...

Identified color-former

427151, 503223, 503226, B41M 516, B41M 518, B41M 522

Patent

active

047057769

ABSTRACT:
The invention relates to chromogenic 3,3-bisindolyl-4-azaphthalides of the general formula ##STR1## wherein Y.sub.1 is hydrogen, C.sub.1 -C.sub.12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or is C.sub.1 -C.sub.12 acyl, benzyl or benzyl substituted halogen, nitro, lower alkyl or lower alkoxy,

REFERENCES:
patent: 3775424 (1973-11-01), Farber
patent: 3916070 (1975-10-01), Ozutsumi et al.
patent: 4102893 (1978-07-01), Garner et al.
patent: 4232887 (1980-11-01), Becker et al.
patent: 4242513 (1980-12-01), Hoover et al.
patent: 4275206 (1981-06-01), Becker et al.

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