Preparation of physical blends of polymers and pigments

Details Preparation of physical blends of polymers and pigments Preparation of physical blends of polymers and pigments

B - Operations, Transporting

29

B

18/1211

B29B 7/90 (2006.01) B29B 7/00 (2006.01) B29C 39/08 (2006.01) C08J 3/20 (2006.01) C08L 23/02 (2006.01)

Patent

CA 1318477

ABSTRACT OF THE DISCLOSURE A method for the manufacture of a physical blend of pigment and a polymer powder is disclosed. The method comprises feeding polymer powder having a particle size in the range of 250 to 750 microns to a high intensity mixer and then feeding powdered pigment to the mixer at a rate of not more than 0.5 parts of pigment per 100 parts of polymer per minute. The pigment has a particle size that is substantially smaller than that of the polymer powder. The resultant admixture is mixed for a further period of time and then discharged from the mixer. The method is particularly applicable to powdered polyethylene intended for use in a rotational moulding process e.g for the manufacture of containers and other hollow articles. DC-0230

588123

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