Heat-sensitive recording material

Details Heat-sensitive recording material Heat-sensitive recording material

1979-02-02

1980-10-07

Hess, Bruce H.

Stock material or miscellaneous articles

Composite

106 21, 282 275, 427151, 428307, 428913, 428914, B41M 518

Patent

active

042269121

ABSTRACT:
The black color developing heat-sensitive recording material comprises a base sheet and a color developing layer formed on at least one surface of the base sheet, the color developing layer including colorless or light-colored chromogenic material and acceptor which is reactive with said chromogenic material to develop a black color. At least 60% by weight of the chromogenic material comprises at least two kinds of black color developing fluoran compounds having the eneral formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, X.sub.l and Ym are described hereinafter and the amount of each of said black color developing fluoran compounds is not larger than 90% by weight of the total amount of said black color developing fluoran compounds.

REFERENCES:
patent: 3501331 (1970-03-01), Kimura et al.
patent: 3669711 (1972-06-01), Kimura et al.
patent: 3825432 (1974-07-01), Futaki et al.
patent: 3825561 (1974-07-01), Akamatsu et al.
patent: 3929831 (1975-12-01), Garner et al.

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