| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a water-base pigment dispersion excellent in storage stability by incorporating a polymerizable surfactant and a pigment in a water-base medium. SOLUTION: An example of a pigment used is a carbon black having a primary particle size of about 10-100nm, pref. about 10-50nm, a DBP absorption of about 40-150ml/100g, pref. about 10-130ml/100g, and a pH of 3-9. About 1-10 pts.wt., pref. about 3-8 pts.wt., pigment (e.g. a carbon black) and about 0.1-5 pts.wt., pref. about 0.4-2.5 pts.wt. ionic surfactant having a polymerizable group (e.g. a vinyl or allyl group) are compounded into 100 pts.wt. water-base medium prepd. by adding about 10-30wt.% water-sol. org. solvent (e.g. ethylene glycol) to water. The resultant compsn. is subjected to grinding treatment in a stainless steel container by using glass beads and a sand grinder, diluted with a certain amt. of water, stirred, and filtered under pressure with a filter paper, thus giving a water-base dispersion of a pigment having an average particle size of 1μm or lower.</p> |
