Leuco dyes and recording materials using the same

Details Leuco dyes and recording materials using the same Leuco dyes and recording materials using the same

1990-03-02

1991-06-18

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

8636, 8645, 8651, 260350L, 503218, C09D 1100, B41M 518

Patent

active

050246992

ABSTRACT:
A leuco dye having the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent a lower alkyl group; R.sup.5 represents an .alpha.-naphthyl group, .beta.-naphthyl group or ##STR2## wherein R.sup.6 represents --NHCOR.sup.9, a halogen or an amino group which is unsubstituted or substituted by one or two C.sub.1 -C.sub.4 alkyl groups which are the same or different; and R.sup.7, R.sup.8 and R.sup.9 each represent hydrogen or a lower alkyl group, provided that when both R.sup.7 and R.sup.8 are hydrogen, R.sup.6 represents --NHCOR.sup.9 or bromine.
These dyes absorb in the near-infrared region and yield colored images with a color developer therefor with excellent preservability.

REFERENCES:
patent: 3940275 (1976-02-01), Brockett et al.
patent: 4770973 (1983-09-01), Kanda et al.
patent: 4784692 (1988-11-01), Umeda et al.

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