Electrochromic marking systems
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United States of America Patent
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Dec 24, 1985
Grant Date -
N/A
app pub date -
Jul 31, 1984
filing date -
Jul 31, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
3-(N-R.sup.2 -N-Acylamino)-7-(N-R.sup.3 -N-R.sup.4 -amino)-10-acylphenothiazines and phenoxazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 3-(N-R.sup.2 -amino)-7-(N-R.sup.3 -N-R.sup.4 -amino)phenothiazinium or phenoxazinium halide 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.
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