Recording system utilizing phthalide derivatives as colorless ch

Details Recording system utilizing phthalide derivatives as colorless ch Recording system utilizing phthalide derivatives as colorless ch

1986-11-13

1988-05-31

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

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

Identified color-former

427151, 503217, B41M 516, B41M 518, B41M 522

Patent

active

047481480

ABSTRACT:
A new phthalide derivative useful as a colorless chromogenic material has the general formula: ##STR1## wherein R.sub.1 to R.sub.10, X.sub.1, X.sub.2, Y.sub.1, Y.sub.2, Z, a and b have the same meaning as defined hereinbefore.

REFERENCES:
patent: 4020056 (1977-04-01), Farber
patent: 4022771 (1977-05-01), Farber
patent: 4107428 (1978-08-01), Farber
patent: 4119776 (1978-10-01), Farber

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