Chromogenic materials employing fluoran compounds

Details Chromogenic materials employing fluoran compounds Chromogenic materials employing fluoran compounds

1986-04-08

1987-07-14

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

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

Identified organic electron acceptor other than phenolic resin

503221, 503225, 503226, 427151, B41M 516, B41M 518, B41M 522

Patent

active

046805982

ABSTRACT:
The fluoran compounds of the formula (I) are new red color forming chromogenic dyes. ##STR1## wherein R represents an isobutyl or isopentyl group, R.sub.1 represents a hydrogen or halogen atom or an alkyl group, R.sub.2 represents a hydrogen or halogen atom or an alkyl group, R.sub.3 represents a hydrogen atom, and R.sub.4 represents a hydrogen atom, or R.sub.4 and R.sub.1 as well as R.sub.2 and R.sub.3 taken together with the carbon atoms to which they are attached may form a benzene ring which may be substituted with a halogen atom. They are used, together with an acidic developer, in chromogenic recording materials for use in pressure sensitive copying paper, heat-sensitive recording paper and thermo-sensitive, reversible color changing composition.

REFERENCES:
patent: 4590498 (1986-05-01), Yahagi et al.
patent: 4612558 (1986-09-01), Anzai et al.
patent: 4613879 (1986-09-01), Yahagi et al.

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