Carbonless duplicating and marking systems utilizing indolyl-sub

Details Carbonless duplicating and marking systems utilizing indolyl-sub Carbonless duplicating and marking systems utilizing indolyl-sub

1979-07-19

1981-06-23

Hess, Bruce H.

Stock material or miscellaneous articles

Composite

Of carbohydrate

26032613R, 26032613H, 26032614R, 427151, 428307, 428913, 428914, 282 275, 41M 517, 41M 522, B41M 516

Patent

active

042751217

ABSTRACT:
Mono-, bis- and tris-indolyl-substituted furanones useful as color formers, particularly in carbonless duplicating and thermal marking systems, which are prepared respectively by: the interaction of an indole with mucochloric acid; the interaction of an indole with a 4-mono(indolyl)-substituted 4-oxo-2-butenoic acid; and by the interaction of an indole with a 2,4-bis(indolyl)-substituted 4-oxobutanoic acid or with a 3,5-bis(indolyl)-substituted furanone.

REFERENCES:
patent: 3920667 (1975-11-01), Idelson
patent: 3931228 (1976-01-01), Borror
patent: 4020068 (1977-04-01), Farber
patent: 4055358 (1977-10-01), Garner et al.
Rees et al., J.C. S., pp. 687-691, 1965.

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