HETEROPHASIC PROPYLENE COPOLYMER

摘要

The invention relates to a heterophasic propylene copolymer comprising a matrix phase comprising a propylene polymer and a dispersed phase comprising an ethylene- a-olefin elastomer comprising ethylene and at least one C3 to C10 oolefin, wherein the propylene polymer has a melt flow index of at least 200 dg/min or at least 150 dg/min as determined by IS01 133:2005 at 230 °C and 2.16 kg, wherein the propylene polymer has an intrinsic viscosity IVPP and the ethylene-α-olefin elastomer has an intrinsic viscosity IVEPR where the ratio of IVEPR/IVPP is 3-7, wherein the copolymer comprises 8- 20 wt% or 20-30 wt% of the ethylene-a-olefin elastomer, wherein the ethylene-a-olefin elastomer of the dispersed phase comprises 10-55 wt% of ethylene.