Ultra High Molecular Weight Ethylene Copolymer Powder

摘要

The present invention relates to an ultrahigh-molecular-weight ethylene copolymer powder having an intrinsic viscosity (eta) of 10 dl/g to 34 dl/g, obtainable by copolymerizing ethylene and at least one olefin selected from the group consisting of alpha-olefins having 3 to 20 carbon atoms, cyclic olefins having 3 to 20 carbon atoms, compounds represented by the formula CH₂-CHR¹ wherein R¹ 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 has a haze of from 30% to 80% and (2) the copolymer powder has a bulk density of from 0.35 g/cm³ to 0.60 g/cm³. According to the invention, there can be provided an ultrahigh-molecular-weight ethylene copolymer powder which is excellent in balance of abrasion properties, physical properties, and moldability and also excellent in transparency and flexibility as compared with conventional ultrahigh-molecular-weight polyethylene and which has a high bulk density.