Patent No. U.S. 7,087,668 B2
Clariant has obtained a patent for a method for dispersing pigments in a polymer matrix comprising the step of adding at least one dispersing auxiliary to the polymer matrix, wherein said at least one dispersing auxiliary is a polyolefin wax synthesized by means of a metallocene catalyst, and wherein the polyolefin wax is derived from ethylene, and wherein the polyolefin wax derived from ethylene is a homopolymer of ethylene or a copolymer of ethylene with one or more linear or branched olefins having 3-18 carbon atoms, wherein the polyolefin wax derived from ethylene has a dropping point of between 90 and 130° C, a melt viscosity at 140° C of between 10 and 10000 mPa·s, and a density at 20° C of between 0.89 and 0.98 g/cm3, and wherein the polyolefin wax is an ultrafine powder having a particle size µm.