FOAMABLE RESIN COMPOSITION FOR PRODUCING HIGHLY FOAMED POLYETHYLENE-COVERED INSULATED ELECTRIC WIRE BY INERT GAS BLOWING AND HIGHLY FOAMED POLYETHYLENE-COVERED INSULATED ELECTRIC WIRE PRODUCED THEREFROM

摘要

PROBLEM TO BE SOLVED: To obtain a highly foamable resin compsn. for producing a covered electric wire by an inert gas blowing with an L-type extruder by compounding a specific high-density polyethylene with a high-pressure low-density polyethylene, polypropylene, and a polysiloxane-polyether block copolymer. ;SOLUTION: 100 pts.wt. high-density polyethylene having an m.p. by DSC of 130°C or higher, 50-200 pts.wt. high-pressure low-density polyethylene having a density of 0.915-0.925 and a melt index of 0.1-10, 2-50 pts.wt. polypropylene having an m.p. by DSC of 140°C or higher, 0.1-5 pts.wt. polysiloxane-polyether block copolymer represented by formula I [wherein R is alkyl, alkoxy, hydroxyl, aryl, or aralkyl; m is 5-300; n is 2-20; and X is a group represented by formula II (wherein p is 0 or 2; q is 0 or 1; t is 2 or 3; s is 5-100; and R' is the same as R)], and 0.02-0.8 pt.wt. nucleating agent comprising azodicarbonamide or talc are thermally mixed at 145-165°C.;COPYRIGHT: (C)1998,JPO