Talc containing polypropylene composition with excellent thermomechanical properties

摘要

The invention pertains to a polypropylene composition consisting of: 55 to 79 wt % base polymer mix; 18 to 44.5 wt % talc; and 0.5 to 3 wt % additives based on the total weight of the polypropylene composition, the base polymer mix containing a XCU fraction and a XCS fraction and the XCU fraction being present in an amount of 91 to 98 wt % and the XCS fraction being present in an amount of 2 to 9 wt %; the base polymer mix containing a comonomer content of less than 5 wt % with respect to the base polymer mix; the talc having a d50 median particle size of 1.0 to 3.0 μm when measured according to ISO 13317-3 15 using a Sedigraph; and the composition having a MFR (230° C./2.16 kg; ISO 1133) of 1 to 10 g/10 min. a process for the production of such a polypropylene composition and article comprising said polypropylene composition.

主权项

1. A polypropylene composition consisting of
55 to 79 wt % base polymer mix; 18 to 44.5 wt % talc; and 0.5 to 3 wt % additivesbased on the total weight of the polypropylene composition,
the base polymer mix containing a XCU fraction and a XCS fraction and the XCU fraction being present in an amount of 91 to 98 wt % and the XCS fraction being present in an amount of 2 to 9 wt %; the base polymer mix containing a comonomer content of less than 5 wt % with respect to the base polymer mix; the talc having a d50 median particle size of 1.0 to 3.0 μm when measured according to ISO 13317-3 15 using a Sedigraph; and the composition having a MFR (230° C./2.16 kg; ISO 1133) of 1 to 10 g/10 min; wherein the base polymer mix is obtained by blending:
homopolymer (A) having an MFR (230° C./2.16 kg; ISO 1133) of 0.3 to 2 g/10 min;heterophasic polymer (B) having a flexural modulus of more than 850 MPa; andhomopolymer (C) having an MFR (230° C./2.16 kg; ISO 1133) of more than 10 g/10 min.