Patent ID: 6429250
Filing Date: 2002-08-06
Classification: C08K,C08L

Abstract:
A process for preparing a talc-reinforced polypropylene molding composition comprisinga) from 35 to 90% by weight of a propylene polymer (A) with a melt flow rate of from 15 to 100 g/10 min at 230Â° C. and under a load of 2.16 kg in accordance with ISO 1133 and a content of from 0 to 25% by weight of other C2-C10-1-alkenes, b) from 5 to 40% by weight of an ethylene polymer (B) with from 20 to 30% by weight of copolymerized C4-C10-1-alkenes, a melt flow rate of from 0.2 to 30 g/10 min at 190Â° C. and under a load of 2.16 kg in accordance with ISO 1133, a density of from 0.850 to 0.880 g/cm3 and a Mooney viscosity (MS 1+4; 121Â° C.) of from 5 to 50 in accordance with DIN 53523/T1, and c) from 5 to 25% by weight of talc whose average particle size by the Sedigraph method is from 1.0 to 10 &mgr;m, wherein the propylene polymer (A), the ethylene polymer (B) and the talc (C) are mixed with one another in a mixing apparatus, which comprises mixing the three components (A), (B) and (C) in a twin-screw extruder at from 180 to 280Â° C., and wherein the three components (A), (B) and (C) are mixed in the presence of an organic peroxide.