| 摘要 |
PROBLEM TO BE SOLVED: To weaken the cohesive force of a pigment itself in case of using ink, for example, for printing, relax the cohesion force by a die and form the cohesion material of the pigment into the fine particle shape by containing the pigment and the die of self-dispersion properties. SOLUTION: A die and a pigment are contained in ink as coloring materials, and the pigment is of the dispersion type in which at least one anionic group is bonded with the pigment surface directly or through another atomic group, and the die is an anionic die, and the Ka value in the Bristol process is less than 1m1∼m<-2> .msec<-1/2> . An anionic group bonded with the surface of the pigment is at least one anionic group selected from a group formed of -COOM, -SO3 M, -PO3 HM, -PO3 M2 , SO2 NH2 and-SO2 NHCOR. M in the anionic group represents hydrogen atom, an alkali metal, ammonium or organic ammonium, and R represents 1-12 C atoms, phenyl substituted or non-substituted, or naphthyl substituted or non-substituted. |
