Polyolefins composition with low CLTE and reduced occurrence of flow marks

A polyolefin composition comprising:

• a. 35-90 wt %, based on the weight of the polyolefin composition, of a heterophasic polypropylene composition having a continuous matrix phase and a discontinuous phase, wherein the continuous matrix phase comprises two propylene homopolymers of different MFR2 and wherein the discontinuous phase comprises two ethylene-propylene rubbers with different molecular weight, and wherein the heterophasic polypropylene composition comprises:
• i. 10-50 wt %, based on the weight of the heterophasic polypropylene composition, of a first propylene homopolymer (PPH1) having an MFR2 measured according to ISO 1133 of from 30-80 g/10 min (230° C., 2.16 kg),
• ii. 20-65 wt %, based on the weight of the heterophasic polypropylene composition, of a second propylene homopolymer (PPH2) having an MFR2 measured according to ISO 1133 of from 100-250 g/10 min (230° C., 2.16 kg),
• iii. 5-30 wt %, based on the weight of the heterophasic polypropylene composition, of a first xylene cold soluble fraction (XS1) having an intrinsic viscosity IVXS1 of 2.0-3.0 dl/g,
• iv. 5-25 wt %, based on the weight of the heterophasic polypropylene composition, of a second xylene cold soluble (XS2) fraction having an intrinsic viscosity IVXS2 of 1.5-2.8 dl/g,
• with the proviso that IVXS1≠IVXS2,
• b. 5-40 wt %, based on the weight of the polyolefin composition, of an inorganic filler, and
• c. 5-25 wt %, based on the weight of the polyolefin composition, of an ethylene/1-butene elastomer;
• wherein the polyolefin composition has a CLTE −30/+80° C.<49 μm/m·K, a CLTE +23/+80° C.<57 μm/m·K, and a flexural modulus>1700 MPa.