Coloring phthalide compounds and recording materials using the c

Details Coloring phthalide compounds and recording materials using the c Coloring phthalide compounds and recording materials using the c

1989-05-19

1990-07-10

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

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

Identified color-former

427151, 428913, 503217, B41M 518

Patent

active

049406914

ABSTRACT:
Coloring phthalide compounds having general formula [I] ##STR1## R.sup.1 represents hydrogen, an alkyl group, or halogen, m is an integer of 1 to 4, when m is 1, R.sup.2 represents hydrogen, an amino group, an alkylamino group, a dialkylamino group, a cyclic amino group, an alkyl group, or halogen, when m is 2 to 4, R.sup.2 represents halogen, R.sup.3 and R.sup.4 each represent a straight chain or branched alkyl group having 1 to 8 carbon atoms, a cyclic alkyl group, or a benzyl group, and R.sup.5 represents hydrogen, an alkyl group or an alkoxyl group; and a thermosensitive recording material including a thermosensitive recording layer comprising any of the above coloring phthalides and a color developer capable of inducing color formation in the phthalide compound are disclosed.

REFERENCES:
patent: 4020056 (1977-04-01), Farber
patent: 4022771 (1977-05-01), Farber
patent: 4630080 (1986-12-01), Satake et al.
patent: 4641160 (1987-02-01), Kondo et al.

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