| 摘要 |
<p>PURPOSE: To improve a cracking durability against halogen containing water of low density and a problem of generating a bubble by using a specific linear low density polyethylene constituent material in an innermost layer of a feeding water pipe. CONSTITUTION: A feeding-draining water transfer pipe is formed multi-layer structure having an innermost layer and an outermost layer. The innermost layer is formed combining a linear low density polyethylene of 50 to 95 wt.% and high density polyethylene of 5 to 50 wt.%, the outermost layer is formed combining low density polyethylene of 95 to 99.5 wt.% and a carbon black of 0.2 to 5 wt.%. The linear low density polyethylene can be obtained adapting a manufacturing process such as a gaseous phase fluidized bed process and copolymerizing ethyleneα-olefin under existing of an ion polymerized catalyst such as a ziegler catalyst.</p> |
