G - Physics – 03 – C
Patent
G - Physics
03
C
G03C 1/815 (2006.01) G03C 1/498 (2006.01) G03C 1/83 (2006.01)
Patent
CA 2108228
ABSTRACT OF THE DISCLOSURE A thermal-dye-bleach construction comprising a dye in association with a thermal dye-bleaching agent of general formula I: I Image wherein: each of Ra and Rb are individually selected from: hydrogen, an allyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic group, and preferably, both Ra and Rb represent hydrogen; p is one or two, and when p is one, Z is a monovalent group selected from: an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group, and a heterocyclic group, and when p is two, Z is a divalent group selected from: an alkylene group, an arylene group, an alkenylene group, an alkynylene group, an aralkylene group, a cycloalkene group, and a heterocyclic group; and, M+ is a cation which will not react with acarbanion generated from the thermal-carbanion-generating agent in such manner as to render the carbanion ineffective as a bleaching agent for the dye.
Farnum Sylvia A.
Frank William C.
Helland Randall H.
Kirk Mark P.
Kitchin Jonathan P.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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