| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polymer pipe having design stress of at least 9.0 MPa and having excellent workability, impact strength, elastic modulus, resistance to fast crack propagation and resistance to slow crack growth. <P>SOLUTION: In this polymer composition, a specified polyethylene composition composed of 1-8 wt.% of carbon black having resistance to the slow crack growth and 92-99 wt.% of bimodal ethylene polymer and having MFR (Melt Flow Rate) in the range of 0.15-0.40g/10 min and density in the range of 955-965 kg/m3 is used. <P>COPYRIGHT: (C)2012,JPO&INPIT |
