| 摘要 |
<p>A pipe made of an ethylene polymer formed from ethylene and a C3-20 (α-olefin, which has (A) a maximum residual stress of 0.13 MPa or lower, (B) a crystallinity of 0.630 to 0.850, (C) a crystallinity gradient with respect to pipe thickness of 0.465 or lower, and (D) a pipe thickness of 5 to 50 mm. The pipe is excellent in durability, rigidity, and impact resistance and is suitable for use as a large-diameter pipe in applications where a high internal pressure is applied.</p> |
