Patent ID: 8173755

Claim:
An ultrahigh-molecular-weight ethylene copolymer powder having an intrinsic viscosity (η) of 12.9 dl/g to 34 dl/g, obtained by copolymerizing ethylene and at least one olefin selected from the group consisting of α-olefins having 3 to 20 carbon atoms, cyclic olefins having 3 to 20 carbon atoms, compounds represented by the formula CH 2 ═CHR 1 wherein R 1 is an aryl group having 6 to 20 carbon atoms, and linear, branched or cyclic dienes having 4 to 20 carbon atoms, wherein (1) a molded article of the copolymer powder, which is molded by pressing the copolymer powder according to ASTM D1928 Procedure C, has a haze according to a method of ASTM D1003 of from 30% to 69%, (2) the copolymer powder has a bulk density of from 0.42 g/cm 3 to 0.60 g/cm 3 , and (3) wherein the molded article of the copolymer powder has a density measured according to ASTM D1505 ranging from 0.900 to 0.922 g/cm 3 .