Patent ID: 7553358
Filing Date: 2009-06-30
Classification: C09D

Abstract:
1. An ink jet ink comprising at least two coloring materials of a first coloring material and a second coloring material, wherein the first coloring material being a compound represented by the following general formula (I) and the second coloring material being a coloring material having a pH buffering ability: wherein R 1 , R 2 , Y 1 and Y 2 each independently represent a monovalent group; X 1 and X 2 each independently represent an electron withdrawing group having a Hammett's σp value of 0.20 or more; Z 1 and Z 2 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocycle group; and M represents a hydrogen atom, an alkali metal, ammonium or organic ammonium.