Thermal-dye-bleach construction

Details Thermal-dye-bleach construction Thermal-dye-bleach construction

G - Physics

03

C

G03C 1/83 (2006.01) B41M 5/28 (2006.01) B41M 5/40 (2006.01) G03C 1/498 (2006.01)

Patent

CA 2109270

ABSTRACT OF THE DISCLOSURE THERMAL-DYE-BLEACH CONSTRUCTION A thermal-dye-bleach construction comprising a polymethine dye having a nucleus of general formula I: Image wherein: n is 0, 1, 2 or 3; W is selected from: hydrogen, alkyl groups of up to 10 carbon atoms, alkoxy and alkylthio groups of up to 10 carbon atoms, aryloxy and arylthio groups of up to 10 carbon atoms, NR1R2, and NR3R4; R1 to R4 are each independently selected from the group consisting of alkyl groups of up to 20 carbon atoms, alkenyl groups of up to 20 carbon atoms; and aryl groups of up to 14 carbon atoms; or R1 and R2 together and/or R3 and R4 together may represent the atoms necessary to complete a 5- or 6-membered heterocyclic ring group; or one or moreof R1 to R4 may represent the atoms necessary to complete a 5- or 6-membered heterocyclic ring group fused to the phenyl ring on which the NR1R2 or NR3R4 group is attached; R5 and R6 are each independently selected from the group consisting of hydrogen atoms, allyl groups of up to 20 carbon atoms, aryl groups of up to 20 carbon atoms, heterocyclic ring groups comprising up to 6 ring atoms, carbocyclic ring groups comprising up to 6 carbon atoms; and fused ring and bridging groups comprising up to 14 ring atoms; and, X- is an anion; in association with a thermal-carbanion-generating agent having the general formula: Image in which each of R9 and R10 is a monovalent group such as hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic group, M+ is a cation which will not react with the carbanion generated from said thermal carbanion generating agent in such manner as to render said carbanion ineffective as a bleaching agent for said polymethine dye. 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, a cycloalkylene group,an alkynylene group, an aralkylene group, an alkenylene group, and a heterocyclic group.

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