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Abstract

A polyolefin alloy and a process for making the same which alloy includes (A) 40% to 80% by weight of polypropylene material which may be a polypropylene homopolymer or a propylene copolymer with ethylene and/or butadiene, the polypropylene copolymer including 5 mole % to 35 mole % polymerized ethylene and/or butadiene, the polypropylene material having a molecular weight Mw of 100,000 to 300,000 and a melt index of 0.1 to 20 g/10 min; (B) 1% to 10% by weight of a functionalized polypropylene, which may be a grafted polypropylene homopolymer or a grafted copolymer of propylene with ethylene and/or butadiene, having a degree of grafting of 0.2% to 10% by weight; (C) 1% to 50% by weight of a mineral having a mean particle size of about 2.5 .mu.m and a maximum particle size of about 20 .mu.m, the mineral being surface-treated with 0.2% to 5% by weight of amino silane; (D) 1% to 15% by weight of an amorphous fatty acid-treated silica gel including 25% to 75% by weight silica and 25% to 75% fatty acid amide; and (E) 0 to 40% by weight of an ethylene/propylene/polyene terpolymer having a melt index in the range of 1 to 10 g/10 min and a Shore D hardness of 30 to 70. The process of making the alloy includes blending the above components, melting and kneading the blend and cooling and granulating the blend. The alloy is characterized by improved surface hardness and scratch resistance.

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