Leuco dyes and recording material employing the same

Details Leuco dyes and recording material employing the same Leuco dyes and recording material employing the same

1990-12-14

1992-01-28

Hollrah, Glennon H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitriles

427151, 503217, 503218, 503225, 558406, 558408, 558409, 560 45, 560 47, 560 48, 564 92, 564180, 564185, 564428, 564442, 564443, C07C25534

Patent

active

050845934

ABSTRACT:
Leuco dyes of the formula (I) are disclosed, ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represent an alkyl group having 1 to 10 carbon atoms; X represents hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or a halogen; and Y represents R.sub.5 --Z--SO.sub.2 NH--, R.sub.6 --Z--CONH--, or ##STR2## in which Z represents ##STR3## R.sub.5 and R.sub.6 each represent hydrogen, an alkyl group having 1 to 10 carbon atoms, or a halogen; and R.sub.7 and R.sub.8 each represent hydrogen, a cyano group, or --COR.sub.9, in which R.sub.9 represents a lower alkyl group, a lower alkoxyl group, a phenyl group which may be substituted by an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, or a halogen; a naphthyl group which may be substituted by an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms or a halogen with the proviso that R.sub.7 and R.sub.8 are not both hydrogen. Further a recording material comprising any of the above-mentioned leuco dyes and a particular phenolic compound as a color developer capable of inducing color formation in the leuco dye is disclosed.

REFERENCES:
patent: 3957288 (1976-05-01), Lemahieu et al.
patent: 3958815 (1976-05-01), Poot et al.
patent: 4912259 (1990-03-01), Kaneko et al.
Yoshiaki, U. et al., "New Leuco Dye for Recording Materials", CA 109, 119802x (1988).
Hideaki, F. et al., "Trivinylmethane Compounds for Color Formers for Recording Materials", CA, 108, 77360y (1988).

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