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US3959571A Chromogenic fluoran derivatives and the preparation and use thereof 失效
显色荧烷衍生物及其制备及应用

Chromogenic fluoran derivatives and the preparation and use thereof
摘要:
A recording material which is suitable as a pressure-sensitive or heat-sensitive copying paper or recording paper by developing a color in contact with an electron-accepting material which comprises certain fluoran derivatives containing piperidino, pyrrolidino, morpholino and cycohexylamino groups.
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