Methods for preparing curable pigment inkjet ink sets

摘要

A curable pigment inkjet ink set having a cyan inkjet ink, a yellow inkjet ink and a magenta inkjet ink comprising
a) a yellow inkjet ink consisting of one or more yellow pigments having ABS(Y) 500-530 < 5 and ABS(Y) 400-S00 > 60;
b) a cyan inkjet ink comprising a ²-copper phthalocyanine pigment; and
c) a magenta inkjet ink with a mixed crystal comprising a first quinacridone and a second quinacridone wherein the ratio of the first quinacridone over the second quinacridone is selected to have ABS(M) 500-530 > 20 and ABS(M) 500-600 > 60 with
ABS(Y) 500-530 representing the absorbance of the yellow inkjet ink between 500 and 530 nm in a normalized absorption spectrum of the yellow ink;
ABS(M) 500-530 representing the absorbance of the magenta inkjet ink between 500 and 530 nm in a normalized absorption spectrum of the magenta ink;
ABS(Y) 400-500 representing the absorbance of the yellow inkjet ink between 400 and 500 nm in a normalized absorption spectrum of the yellow ink; and
ABS(M) 500-600 representing the absorbance of the magenta inkjet ink between 500 and 600 nm in a normalized absorption spectrum of the magenta ink. Also disclosed is a curable pigment inkjet ink set comprising yellow, cyan and magenta inkjet inks characterized in that the yellow inkjet ink comprises C.I. Pigment Yellow 150, the cyan inkjet ink comprising a ²-copper phthalocyanine pigment and the magenta inkjet ink comprises a mixed crystal containing C.I. Pigment Violet 19 and C.I. Pigment Red 202 with C.I. Pigment Violet 19 present in the mixed crystal in an amount between 75 and 95 % as measured by Probe-MS.