Printer ink composition and printing medium using the same

Details Printer ink composition and printing medium using the same Printer ink composition and printing medium using the same

C - Chemistry, Metallurgy

09

D

C09D 11/00 (2006.01) B41M 5/10 (2006.01)

Patent

CA 2071821

ABSTRACT A printer ink composition containing a triphenylmethane dye or a lake pigment derived therefrom as a coloring agent, comprising as the coloring agent a triphenylmethane dye having general formula (I): Image (I) wherein R1, R2, R5 and R4 are independently hydrogen atom, an alkyl group, an aralkyl group or an aryl group, R5 is an aryl group, X- is a counter ion, and ring A or ring B may be substituted by one or more substituents, provided that at least one group among R1, R2, R3 and R4 is not methyl and in the case that R5 is p-dimethylaminophenyl, at least one of R1 and R2 and at least one of R3 and R4 are not methyl; or a lake pigment derived therefrom, in order to prevent the formation of Michler's ketone. The ink composition is used for printing media for printer such as fabric ink ribbon, ink roll, ink-retaining element, thermal transfer ink ribbon, and pressure- sensitive transfer ink ribbon.

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