Thermal imaging method

Details Thermal imaging method Thermal imaging method

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42/3, 260/309.1,

B41M 5/30 (2006.01) B41M 5/323 (2006.01) C07D 417/14 (2006.01) C07D 491/10 (2006.01) C07D 513/10 (2006.01) C09B 11/04 (2006.01)

Patent

CA 1276029

THERMAL IMAGING METHOD Abstract of the Disclosure A thermal imaging method is provided which comprises heating imagewise a di- or triarylmethane compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho position to the meso carbon atom with a moiety ring-closed on the meso carbon atom directly through a nitrogen atom, which nitrogen atom is also bound to a group with a masked acyl substituent that undergoes fragmentation upon heating to liberate the acyl group for effecting intramolecular acylation of said nitrogen atom to form a new group in the ortho position whereby the di- or triarylmethane compound is rendered colored in an imagewise pattern corresponding to said imagewise heating.

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