Expanded beads comprising high melt strength polypropylene

The invention relates to a polymer composition comprising a) > = 10% and < = 60% by weight of a high melt strength polypropylene, b) > = 10% and < = 35% by weight of a polyethylene, c) > = 10% and < = 60% by weight of a first polypropylene, the first polypropylene being selected from the group consisting of propylene homopolymers, propylene copolymers and/or mixtures thereof, and d) a second polypropylene being selected from the group consisting of propylene homopolymers, propylene copolymers and/or mixtures thereof. D) > = 0% and < = 60% by weight of a second polypropylene wherein the sum of the high melt strength polypropylene, the first polypropylene and the second polypropylene is > = 60% by weight based on the sum of the weights of the high melt strength polypropylene, the polyethylene, the first polypropylene and the second polypropylene, and wherein the polyethylene has a density of > = 940 kg/m3 and < = 970 kg/m3 as determined according to ISO 845 (2006). 本发明涉及一种包含以下的聚合物组合物：a)≥10重量％且≤60重量％的高熔体强度聚丙烯，b)