| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cross-linked polyethylene pipe being superior in pressure resistance, and also good in workability for piping and in productivity. <P>SOLUTION: The cross-linked polyethylene pipe is made by heating a molded pipe of a silane-modified polyethylene resin composition and going through a cross-linking treatment by a silanol condensation reaction, the molded pipe made of the silane-modified polyethylene resin composition is made by that a polyethylene base resin, a silanol condensation catalyst, a silane compound and a radical generator are molten, kneaded and reacted under heating in an extruder, and are extruded to form a pipe shape and cooled, and the polyethylene base resin is the one with specified density and a specified melt flow rate and polymerized by a single site catalyst and is also the one with a specified molecular weight distribution in measurement by using a cross fractionation apparatus in which a temperature rising elution fractionation and a gel permeation chromatograph are combined. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
