Talc containing polypropylene composition with excellent thermomechanical properties

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.

Process for the production of a polypropylene composition by blending 55 to 79 wt % base polymer mix, 18 to 44.5 wt % talc 0.5 to 3 wt % additives, based on the total weight of the polypropylene composition, whereby the base polymer mix is

• 50 to 65 wt % homopolymer (A) having an MFR (230° C./2.16 kg;
• ISO 1133) of 0.3 to 2 g/10 min;
• 20 to 32 wt % heterophasic polypropylene (B) having an MFR (230° C./2.16 kg;
• ISO 1133) of 5 to 20 g/10 min and a flexural modulus of more than 850 MPa when measured according to ISO 178;
• and
• 10 to 20 wt % homopolymer (C) having an MFR (230° C./2.16 kg;
• ISO 1133) of more than 10 g/10 min
• based on the total weight of the base polymer mix.