Method of preparing coated pigment particles and the product pro

Compositions: coating or plastic – Materials or ingredients – Miscellaneous

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106308Q, 252316, C09C 308

Patent

active

041734920

ABSTRACT:
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 pigment particles with a wax having a given melting point temperature and a brittle condition below a 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 produce a solid mass, and, then, breaking the solid mass into flakes.

REFERENCES:
patent: 3546150 (1970-12-01), White et al.
patent: 3728143 (1973-04-01), Pollard
patent: 3773535 (1973-11-01), Burgyan et al.
Perry, R. H., et al., Chemical Engineers' Handbook, McGraw-Hill Book Co., New York, 1973, pp. 19-17 to 19-18.
The Condensed Chemical Dictionary (van Nostrand Reinhold Company, New York), 1971, pp. 176-177, "castorwax".

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