FLUORINE-TREATED BARIUM SULFATE POWDER AND COSMETIC CONTAINING THE SAME

摘要

PURPOSE:To enhance the water and oil repellency of BaSO4 powder by subjecting the powder to surface treatment with a fluorine compd. CONSTITUTION:A barium salt soln. having 0.001-0.05mol/l concn. is mixed with a sulfate or sulfuric acid soln. having 0.001-0.05 mol/1 concn. in (1:10)-(5:1) molar ratio so that pH 1.0-5.0 is attained and the resulting mixture is brought into a reaction at 5-100 deg.C to obtain BaSO4 powder having 5-100 ratio of the average diameter of the platy faces to the thickness and 20-150 ratio of the square of the peripheral length of the platy faces to the total area of the platy faces. The objective fluorine-treated BaSO4 powder is obtd. by subjecting 100 pts.wt. of the resulting BaSO4 powder to surface treatment with 0.05-20 pts.wt. fluorine compd. and cosmetics are blended with 0.1-99.9wt.% of the fluorine-treated BaSO4 powder.