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

1989-01-23

1990-03-06

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264122, 264349, 366160, 366162, 523346, 523351, B28B 120, B29C 3106, G05D 1100

Patent

active

049064282

ABSTRACT:
A method for the manufacture of a physical blend of pigment and a polymer powder whereby polymer powder having a particle size in the range of 250 to 750 microns is fed to a high intensity mixer and then powdered pigment is fed 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.

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