| 摘要 |
<p>PURPOSE:To obtain the titled dispersant capable of giving offset ink with high homogeneity and good fluidity, by reaction between a rosin (derivative) containing -CO2H or -NH2 and an organic coloring matter (derivative) having functional group reactive with -CO2H or -NH2. CONSTITUTION:The objective dispersant can be obtained by reaction, e.g. in a solvent such as methanol at 60 deg.C for 3hr, between (A) an organic coloring matter or its derivative (e.g. a reaction product from an organic coloring matter such as of quinacridone base and chlorosulfonic acid) having such functional group as to be reactive with -CO2H or -NH2 (e.g. -SO2Cl) and (B) a rosin or its derivative having -CO2H or -NH2 (e.g. rosin amine). This dispersant is preferably incorporated in a pigment in such an amount of 0.3-30pts.wt. per 100pts.wt. of the pigment. EFFECT:Capable of providing prints, etc., outstanding in coloring power, clearness in color tone, etc.</p> |
