Polymer composition and expanded polypropylene beads made from the polymer composition

A polymer composition comprising:

• 100 wt % of a propylene copolymer based on the total amount of the polymer composition, wherein a comonomer in the propylene copolymer is selected from moiety derived from ethylene, an α-olefin having 4 to 20 carbon atoms or a combination thereof, wherein the amount of the comonomer is in the range of 3.7 to 4.0 wt % based on the propylene copolymer, wherein the fraction of the polymer composition melted in the temperature range from 116 to 151° C. is in the range from 70 to 90 wt % based on the total weight of the polymer composition;
• wherein at 151° C. tan δ of the polymer composition is in the range from 0.15 to 0.11 when tested according to ASTM D4092-07 (2013) with the following setting:
• Oscillatory Temperature Ramp with 17.5 mm Single Cantilever Geometry at 1 Hz, 6% Oscillation strain, temperature ramps from 27 to 160° C. at the rate of 5° C./min, wherein the melt flow index (MFI) of the propylene copolymer is in the range from 8 to 10 g/10 min when determined according to ISO1133-1:2011 with 2.16 kg load at 230° C., and wherein the strain at break of the polymer composition is from 500 to 551% when determined according to ISO527-1(2012).