Method of preparing coated pigment particles and the product produced thereby

Abstract From the Canadian patent

Abstract of the Disclosure A method of preparing coated pigment particles for dry compounding with a polymeric material such as plastic or rubber, which method comprises the steps of providing particles of a hydrophilic color pigment mixing the pig-, ment particles with a wax having a given boiling point temperature and a brittle condition below à given lower temperature, heating the mixture above a process temperature substantially above the melting temperature and substantially above the boiling point of water to boil away entrapped water, subjecting the mixture to high shear mixing while at the process temperature, cooling the mixture to a temperature below the given lower temperature to …