Electrochromic marking systems

Details Electrochromic marking systems Electrochromic marking systems

1984-07-31

1986-02-11

Hess, Bruce H.

Recorders

Record receiver deforming

204 2, 346217, 427151, B41M 520

Patent

active

045701717

ABSTRACT:
5-[N-(RCO)-N-R.sup.1 -amino] or (RCOO)-9-(N-R.sup.2 -N-R.sup.3 -amino)-12-(RCO)benzo[a]phenoxazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 5-(N-R.sup.1 -amino)-9-(N-R.sup.2 -N-R.sup.3 -amino)benzo[a]phenoxazinium halide or 9-(N-R.sup.2 -N-R.sup.3 -amino)benzo[a]phenoxazin-5-one with a reducing agent to obtain the corresponding leuco compound and subsequently interacting the leuco compound with at least two molecular proportions of an acylating agent.

REFERENCES:
patent: 3873340 (1975-03-01), Miyazawa et al.
patent: 3900217 (1975-08-01), Hayashi et al.
patent: 4309255 (1982-01-01), Gendler et al.
Sloviter, Journal of the American Chemical Society, 71, 3360-3362, (1949).
Crossley et al., Journal of the American Chemical Society, 74, 573-586, (1952).
Sen et al., Journal of Organic Chemistry, 26, 3861-3863, (1961).

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