Electrochromic and marking systems

Details Electrochromic and marking systems Electrochromic and marking systems

1984-07-31

1985-11-05

Hess, Bruce H.

Recorders

Record receiver deforming

204 2, 346217, 427151, B41M 520

Patent

active

045517401

ABSTRACT:
3-(R-Carbonyloxy)-7-(N-R.sup.1 -N-R.sup.2 -amino)-10-(RCO)-phenothiazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 7-(N-R.sup.1 -N-R.sup.2 -amino)phenothiazin-3-one with a reducing agent to obtain the corresponding leuco compound and subsequently interacting the leuco compound with about two molecular proportions of an acylating agent.

REFERENCES:
patent: 3873340 (1975-03-01), Miyazawa et al.
patent: 3900217 (1975-08-01), Hayashi et al.

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