FOAMABLE RESIN COMPOSITION FOR FOAMED INSULATING POLYETHYLENE COVERING AND FOAMED INSULATING POLYETHYLENE COVERED WIRE PRODUCED BY COVERING WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To prevent an inner or outer conductor from rusting even when azodicarbonamide used contains an impurity by compounding a polyethylene resin, azodicarbonamide contg. residual chlorine as the impurity, and an impurity scavenger. ;SOLUTION: 100 pts.wt. polyethylene resin is compounded with 0.5-5 pts.wt. azodicarbonamide contg. residual chlorine as an impurity, 0.005-5 pts.wt. impurity scavenger selected from among hydrotalcite, a higher fatty acid metal salt, magnesium oxide, calcium oxide, magnesium hydroxide, calcium hydroxide, zeolite, an organotin compd., and calcium phosphate, and necessary amts. of an auxiliary blowing agent, a foaming homogenizer, a colorant, an antioxidant, a nucleating agent, a copper inhibitor, a process aid, a preventive for resinous deposition, etc. The resultant compsn. is melt kneaded at the m.p. of the resin or higher, then kneaded at a temp. lower than the decomposition point of azodicarbonamide, and sheeted.;COPYRIGHT: (C)1998,JPO