Pigmented polycarbonates
AssigneeMobay Chemical Corporation
InventorsArthur L. Baron, John V. Bailey
Life of this patent
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Abstract
Polycarbonates are pigmented with an opaque pigment such as TiO.sub.2 and contain, intimately mixed therein, a silica at a level of 0.01 to 3% by weight. The silicas are those produced by the flame hydrolysis of SiCl.sub.4 and have a particle size up to about 10 microns. The pigmented polycarbonates can be moulded to form articles having excellent surface appearance and are especially adapted for moulding polycarbonates in moulds having radical contours and fine interstices which constrict the flow path of the polycarbonate during moulding.
Claims8
A method for improving the surface properties of articles molded from a pigmented polycarbonate in molds having radical contours and fine interstices, the improvement comprising blending 0.01 to 3% by weight of silica having a particle size between about 1 and 50 millimicrons into a polycarbonate resin containing sufficient pigment to opacify said polycarbonate resin when molded into an article.
Dependencies are inferred from the claim text.