High transparency pigments

摘要

The present invention provides a method for preparing conditioned pigments that have smaller diameter and increased color strength, masstone and travel by milling pigment with a dispersant comprising polyurethane. Further, the invention provides the conditioned pigments prepared by the method of the invention and their applications to paints, coatings, inks, plastics, optical devices, color filters and so forth.

主权项

1. A method for producing a conditioned pigment comprising:
(a) milling a pigment with a dispersant comprising polyurethane having a molecular weight of about 1,000 to about 100,000 to obtain a resulting slurry, wherein at the start of the milling, the milling mixture has a total solids content of about 10 to 50% by weight and the amount of the dispersant is about 1 wt% to 50 wt% based on weight of the pigment; and (b) isolating a solid product containing the pigment and the dispersant from the resulting slurry, the solid product being the conditioned pigment; wherein the pigment is a perylene.