Stabilized polypropylene compositions
AssigneeCabot Corporation
InventorsGeorge R. Cotten, Avrom I. Medalia
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Abstract
This disclosure relates to the use of certain heat-treated carbon blacks as stabilizers against the effects of degradation caused by visible and ultraviolet light in the preparation of polypropylene resin compositions containing conventional antioxidants which impart thermal stability to the polypropylene resin.
Claims6
A composition of matter having improved resistance to the harmful effects of visible and ultraviolet light comprising a thermally stabilized polypropylene and as a light stabilizer for the composition a furnace carbon black which has been heat treated at a temperature of from about 1200.degree. to about 3000.degree. C. under a non-oxidizing atmosphere, said light stabilizer being present in amounts of from about 0.1 to about 2.0 percent by weight based on the weight of the thermally stabilized polypropylene.
Dependencies are inferred from the claim text.