Heat sensitive recording element

Details Heat sensitive recording element Heat sensitive recording element

1987-09-28

1989-06-13

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

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

Identified color-former

427151, 428195, 428913, 428914, 503218, 503223, B41M 518

Patent

active

048393355

ABSTRACT:
A heat responsive recording element having a recording layer containing a colorless di- or tri-aryl methane compound having a closed ring moiety incorporating the meso carbon atom and containing a nitrogen atom directly bonded to the meso carbon. The nitrogen atom is also bonded to a heterocyclic or carbocyclic ring substituted with an alkylating group. Upon heating the recording layer imagewise the alkylating group effects intramolecular alkylation of the nitrogen atom with irreversible breaking of the meso carbon atom-nitrogen atom bond rendering the compound colored in the imagewise heating pattern.

REFERENCES:
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patent: 3488705 (1970-01-01), Fox et al.
patent: 3832212 (1974-08-01), Jenkins et al.
patent: 4132436 (1979-01-01), Ishige et al.
patent: 4380629 (1983-04-01), Yamashita et al.
patent: 4525588 (1985-01-01), Zink
patent: 4536219 (1985-08-01), Riou et al.
patent: 4602263 (1986-06-01), Borror et al.
Kosar, J., Light-Sensitive Systems: Chemistry and Application of Nonsilver Halide Photographic Processes, New York, N.Y., John Wiley and Sons, Inc., 1976, pp. 402-419.

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