Indolylazaphthalides and recording materials containing the same

Details Indolylazaphthalides and recording materials containing the same Indolylazaphthalides and recording materials containing the same

1996-05-16

1997-11-25

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

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

Plural colors or plural diverse systems

503216, 503217, 503220, B41M 5136, B41M 530, B41M 534

Patent

active

056912714

ABSTRACT:
The present invention provides novel indolylazaphthalides represented by formula (I) described below. The indolylazaphthalides are useful as electron donative colorless dyes for preparing recording materials. Recording materials containing the novel indolylazaphthalides of formula (I) as electron donative colorless dyes provide images having blue to cyan colors at an excellent density, while suppressing light coloration in non-image areas. ##STR1## wherein R.sup.1 represents a divalent linkage group such as an alkylene group, cycloalkylene group, aralkylene group, or a phenylene group, which linkage group is linked to a bimolecular indolylazaphthalide compound to form a bis-type structure.

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