| 摘要 |
PROBLEM TO BE SOLVED: To provide ethylenic polymer composition powder containing an ultra high molecular weight ethylenic polymer capable of being produced efficiently in an industrial process and excellent in molding processability. SOLUTION: This ethylenic polymer composition powder produced by a multi-stage polymerization method, consisting of at least a low molecular weight component and a high molecular weight component, and containing the ultra high molecular weight ethylenic polymer is provided with that the viscosity-average molecular weight of the ethylenic polymer composition is≥100,000 and≤1,600,000, the weight-average molecular weight of the low molecular weight component is≥5,000 and≤100,000, the mass fraction of the high molecular weight component is≥30 mass% and≤70 mass%, and the bulk density of the ethylenic polymer composition powder is≥0.30 g/cm<SP>3</SP>and≤0.45 g/cm<SP>3</SP>. COPYRIGHT: (C)2007,JPO&INPIT
|
