| 摘要 |
High-hiding calcium color lakes, possessing great full-shade brilliance and improved lightfastness, of the general formula <IMAGE> where D is a radical of the formula <IMAGE> in which (1) a predominant proportion of primary particles has one or more dimensions greater than 0.3 mu m, (2) the length/width ratio of the predominant proportion of primary particles is not less than 2:1 and for which (3) the lightfastness of polyethylene containing 0.05% of colorant, and of plasticized PVC containing a 1:10 reduction of colorant, is rated at least 5 on a blue scale with ratings of from 1 to 8. The lakes are particularly suitable for coloring plastics. |
