Color reversing compositions

Details Color reversing compositions Color reversing compositions

1977-05-11

1986-01-28

Miller, Edward A.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

116216, 374163, 436 2, 2524081, 428913, G01N 3122, C09K 300

Patent

active

045670196

ABSTRACT:
Heat-sensitive compositions which rapidly develop color upon heating and rapidly discharge their color upon cooling, comprising an intimate mixture of a 3,3-bis (p-aminophenyl) phthalide and an organic acid. The color-producing and color-discharging cycle may be reproduced many times without noticeable change in response. The novel compositions of the invention are useful as temperature indicators, thermal display media, safety papers and validation devices.

REFERENCES:
patent: 3389007 (1968-06-01), Oda
patent: 3445261 (1969-05-01), Talvalkar
patent: 3674535 (1972-07-01), Blose
patent: 3751286 (1973-08-01), Newman
patent: 3895173 (1975-07-01), Adachi
patent: 3916068 (1975-10-01), Kohmura
patent: 4138357 (1979-02-01), Igarashi

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