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

1988-05-31

1990-05-15

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

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

Identified color-former

427150, 428913, 503217, B41M 518

Patent

active

049258281

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: 4770973 (1983-09-01), Kanda et al.
Grif et al., "Direction of Nucleophilic Addition to Polymethine Dyes", Zhurnal Organicheskoi Khimii, vol. 15, No. 12, pp. 2503-2508, Dec. 1979.

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