The foaming Characteristic resin constituent for the high polyethylene foam canning electric wire production by inert gas foaming modulo canning and this, the high foaming insulating polyethylene canning electric wire null which

摘要

PROBLEM TO BE SOLVED: To obtain a resin composition which, when extruded with a single- screw extruder, gives a foamed body having a high expansion ratio and a uni form fine cell structure by an inert gas blowing process by kneading a high- density polyethylene, a specified low-density polyethylene, a polypropylene, a polysiloxane/polyether block copolymer, and a nuclear forming agent. ;SOLUTION: This composition is obtained by mixing 100 pts.wt. high-density polyethylene having a melting point of 127-136C, a density of 0.945-0.968 g/cm3 and a melt flow rate of 0.1-10.0 g/10 min with 20-150 pts.wt. high-pressure process low-density polyethylene having a density of 0.915-0.925 g/cm3 and a melt flow rate of 0.1-10.0 g/10 min and 0.1-5 pts.wt. polysiloxane/polyether block copolymer of formula I, and 0.02-5 pts.wt. nucleator comprising azodicarbonamide and/or talc and kneading the mixture at a temp. of 145-165C. In the formula, R is a monovalent alkyl or the like; X is a group of formula II; (m) is 5-300; (t) is 2 or 3; (s) is 5-100; and (n) is 2-20.;COPYRIGHT: (C)2000,JPO