Compatibilised polyolefin and polyphenylene oxide and/or polystyrene composition

A composition comprising a polyolefin, a polyphenylene oxide (PPO) and optionally polystyrene (PS) and a compatibiliser, wherein said compatibiliser is a block or graft copolymer comprising a polyolefin part and a polystyrene part, wherein the Mn of the polyolefin part is between 1 and 40 kg/mol and the Mn of the polystyrene part is between 4 and 16 kg/mol, wherein further the compatibiliser is present in an amount of between 2 to 20 wt. % of the total amount of the composition, wherein the polyolefin block of the compatibiliser is a propylene homopolymer block or a propylene copolymer block containing at least 90 wt. % of polypropylene, on the basis of the weight of the polypropylene block.