| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject dispersion excellent in long-term storage stability and environmental stability by using a polymer dispersion obtained from a specific raw material as a dispersion. SOLUTION: This color material dispersion comprises (A) a water-insoluble or slightly water-soluble coloring material, (B) a polymer dispersion obtained by subjecting a sulfonated product obtained by sulfonating creosote oil to formalin condensation and neutralizing the condensed product and (C) a water-soluble medium. When concentrated sulfuric acid is used as the sulfonating agent in preparing the component B, creosote oil is charged into a reactor having an agitator and then, concentrated sulfuric acid is added thereto at 150-170 deg.C and sulfonation is preferably carried out for 1-2hr. Weight average molecular weight of the component B is preferably 2,000 to 50,000. It is preferable to include 15-30wt.% component A, 1.5-30wt.% component B and 50-83wt.% component C in the objective dispersion. The weight ratio of the components A/B is preferably (100/100) to (100/30). Pigment, oil-soluble dye, etc., is preferably used as the component A. |
