Polyolefin composition with low CLTE

1. Polyolefin composition comprising

a. 54-70 wt %, of a heterophasic propylene copolymer comprising

i. 70-90 wt %, based on the weight of the heterophasic propylene copolymer of a propylene homopolymer, and

ii. 10-30 wt %, based on the weight of the heterophasic propylene copolymer of an ethylene-propylene rubber,

b. 2-10 wt % of an ethylene/α-olefin elastomer, the α-olefin being a C 4 -C 10 α-olefin,

c. 20-46 wt % of an inorganic filler, and

d. at least two different α-nucleating agents in a total amount of 0.0011-2.0 wt %;

wherein the heterophasic propylene copolymer and the ethylene/α-olefin elastomer together account for at least 97% of all polymeric components of the polyolefin composition; and

wherein the polyolefin composition has a CLTE<60 μm/m.K.

2. The polyolefin composition according to claim 1 , wherein the inorganic filler is selected from the group consisting of talc and wollastonite.

3. The polyolefin composition according to claim 1 , wherein the inorganic filler has a median particle size (D 50 ) of 1.0-15 μm and a top cut (D 97 ) of 3-50 μm.

4. The polyolefin composition according to claim 1 , wherein the ethylene/α-olefin elastomer has a density of from 860-915, kg/m 3 .

5. The polyolefin composition according to claim 1 , wherein the ethylene/α-olefin elastomer has an MFR of from 0.3-100 g/10 min (190° C., 2.16 kg).

6. The polyolefin composition according to claim 1 , wherein the MFR of the polyolefin composition is from 5.0-50 g/10 min (230° C., 2.16 kg).

7. The polyolefin composition according to claim 1 , wherein the alpha-nucleating agents are selected from the group consisting of aluminum hydroxy-bis[2,4,8,10-tetrakis(1,1-dimethylethyl)-6-hydroxy-12H-dibenzo-[d,g]-dioxa-phosphocin-6-oxidato], sodium-2,2′-methylene-bis(4,6-di-t-butylphenyl)-phosphate, aluminum-hydroxy-bis[2,2′-methylene-bis(4,6-di-t-butyl-phenyl)-phosphate], sorbitol based nucleating agents and polymeric nucleating agents selected from the group consisting of vinylcycloalkane polymers and vinylalkane polymers.

8. The polyolefin composition according to claim 7 , wherein at least one of the alpha nucleating agent is a polymeric nucleating agent selected from the group consisting of vinylcycloalkane polymers and vinylalkane polymers.

9. The polyolefin composition according to claim 1 , wherein the intrinsic viscosity of the XCS (Xylene cold solubles) content of the heterophasic propylene copolymer is in a range of 1.5-3.5 dl/g.

10. The polyolefin composition according to claim 1 , wherein the ethylene-propylene rubber of the heterophasic propylene copolymer is unimodal.

11. Moulded article comprising:

a polyolefin composition comprising

a. 54-70 wt %, of a heterophasic propylene copolymer comprising

i. 70-90 wt %, based on the weight of the heterophasic propylene copolymer of a propylene homopolymer, and,

ii. 10-30 wt %, based on the weight of the heterophasic propylene copolymer of an ethylene-propylene rubber,

b. 2-10 wt % of an ethylene/α-olefin elastomer, the α-olefin being a C 4 -C 10 α-olefin,

c. 20-46 wt % of an inorganic filler, and

d. at least two different α-nucleating agents in a total amount of 0.0011-2.0 wt %;

wherein the heterophasic propylene copolymer and ethylene/α-olefin elastomer together account for at least 97% of all polymeric components of the polyolefin composition; and

wherein the moulded article has a CLTE<60 μm/m.K.

12. The moulded article according to claim 11 , wherein the moulded article is an injection moulded article.

13. The moulded article of claim 11 having the following properties:

a. Tensile Modulus>2500 MPa,

wherein the moulded article produced from said polyolefin composition is an injection moulded article.

14. The moulded article according to claim 11 , wherein the intrinsic viscosity of the XCS content of the heterophasic propylene copolymer is in a range of 1.5-3.5 dl/g.

15. The moulded article according to claim 11 , wherein the ethylene-propylene rubber of the heterophasic propylene copolymer is unimodal.

16. Polyolefin composition comprising

a. 54-70 wt %, of a heterophasic propylene copolymer comprising

iii. 70-90 wt %, based on the weight of the heterophasic propylene copolymer of a propylene homopolymer, and

iv. 10-30 wt %, based on the weight of the heterophasic propylene copolymer of a unimodal ethylene-propylene rubber,

b. 2-10 wt % of an ethylene/α-olefin elastomer, the α-olefin being a C 4 -C 10 α-olefin,

c. 20-46 wt % of an inorganic filler, and

d. at least two different a-nucleating agents in a total amount of 0.0011-2.0 wt %;

wherein the heterophasic propylene copolymer and the ethylene/α-olefin elastomer together account for at least 97% of all polymeric components of the polyolefin composition; an intrinsic viscosity of the XCS (Xylene cold solubles) content of the heterophasic propylene copolymer is in a range of 1.5-3.5 dl/g; and

wherein the polyolefin composition has a CLTE<60 μm/m.K.