C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 3/21 (2006.01) B29B 9/16 (2006.01) B29B 13/10 (2006.01) B29C 41/04 (2006.01) C08J 3/205 (2006.01) C08K 3/04 (2006.01)
Patent
CA 2296611
The present invention provides a new and improved method of using a volatile liquid color system to prepare colorant-coated polymeric resin powders for use in rotational molding. The method according to the present invention includes simultaneously feeding polymeric resin pellets or granules and a volatile liquid color system into a grinding mill to produce a colorant-coated polymeric resin powder for use in rotational molding. During grinding, the volatile liquid color system coats the surface of the freshly ground polymeric resin powder and dries, leaving no residues that will volatilize during rotational molding or exude from the surface of rotationally molded parts during molding. The method of the present invention eliminates the need for additional processing steps after resin grinding, such as distributive mixing and drying. Rotational molded articles produced according to the present invention exhibit excellent color uniformity.
Ferro Corporation
Moffat & Co.
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