Polyolefin composition for medium/high/extra high voltage cables with improved electrical breakdown strength

1. A polyolefin composition comprising:

(i) a polyolefin (A); and

(ii) an aromatic compound (B) comprising:

a structural unit according to the following Formula (I):

wherein two of R1, R2, R3, R4, R5, R6, R7, and R8 independently are selected from the group consisting of —O(R9) and —N(R10) 2 ; wherein R9 and R10 independently are hydrocarbyl groups having at least 5 non-H atoms; and

wherein the remaining R1, R2, R3, R4, R5, R6, R7, and R8 are —H;

with the proviso that:

(i) at least one of R1, R2, R3, R4, R5, R6, R7 or R8, has at least 6 non-H atoms.

2. The polyolefin composition according to claim 1 , wherein R9 and R10 independently are a hydrocarbyl group optionally containing heteroatoms selected from the group consisting of Si, N, P, O and S, and has 5 to 50 carbon atoms.

3. The polyolefin composition according to claim 2 , wherein R9 and R10 independently are alkyl groups.

4. A master batch comprising

(i) a polyolefin in an amount of 50 wt. % or more, and

(ii) an aromatic compound (B) comprising a structural unit as defined in claim 1 .

5. A method for the production of a layer of a cable using a master batch according to claim 4 .

6. A cable comprising a layer made of a polyolefin composition according to claim 1 .

7. The cable according to claim 6 , wherein the cable is a medium, high or extra high voltage cable comprising an inner semiconductive layer, an insulating layer and an outer semiconductive layer.

8. The cable according to claim 7 , wherein at least the insulating layer is made of the polyolefin composition according to claim 1 .

9. The cable according to claim 6 , wherein the cable is a medium, high or extra high voltage cable.

10. A method for the production of a layer of a cable using a polyolefin composition according to claim 1 .