Bis-(indoly)ethylenes record systems utilizing such compounds

Details Bis-(indoly)ethylenes record systems utilizing such compounds Bis-(indoly)ethylenes record systems utilizing such compounds

1990-08-25

1991-03-19

Ramsuer, Robert W.

Record receiver having plural interactive leaves or a colorless

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

Identified color-former

503218, 427151, B41M 518

Patent

active

050011057

ABSTRACT:
Novel bis-(indolyl)ethylenes, process for their production and record systems utilizing such bis-(indolyl)ethylene chromogens are described.
Bis-(indolyl)ethylenes of the following general formula are prepared: ##STR1## wherein each L.sup.1 and L.sup.2 is the same or different and is each independently selected from indole moieties (J1) through (J4) (L.sup.1 need not be the same as L.sup.2), ##STR2## wherein Z is hydrogen, alkyl (C.sub.1 -C.sub.8), substituted or unsubstituted aryl, aralkyl, aroxyalkyl, alkoxyalkyl or halogen.

REFERENCES:
patent: 4795736 (1989-01-01), Hung et al.
patent: 4931567 (1990-06-01), Psaar et al.

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