Di[bis-(indolyl)ethylenyl]tetrahalophthalide record materials

Details Di[bis-(indolyl)ethylenyl]tetrahalophthalide record materials Di[bis-(indolyl)ethylenyl]tetrahalophthalide record materials

1990-07-24

1992-10-20

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

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

Having nonchromogenic liquid spread-control or...

427 15, 503208, 503220, 503221, 503223, B41M 530

Patent

active

051570122

ABSTRACT:
Pressure-sensitive and heat-sensitive record materials are described comprising a substrate, an acidic developer and chromogenic di-[bis-(indolyl) ethylenyl]tetrahalophthalides of the formula ##STR1## wherein each X.sup.1, S.sup.2, X.sup.3, and X.sup.4 is independently selected from chlorine or bromine;

REFERENCES:
patent: 4730057 (1988-03-01), Kanda et al.

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