Resin composition, insulated electric wire and method of manufacturing insulated electric wire

A method of manufacturing an insulated electric wire comprising the steps of:

• (a) forming a resin composition by kneading a base polymer and a metallic hydroxide;
• (b) a step of manufacturing an uncross-linked insulated electric wire by extruding the resin composition so as to coat periphery of a conductor to form an insulating layer;
• and
• (c) a step of manufacturing a cross-linked insulated electric wire by irradiating the uncross-linked insulated electric wire with electron beam to cross-link the base polymer in the resin composition,
• wherein the base polymer contains at least ethylene-vinyl acetate copolymer and ethylene-(α-olefin) copolymer,
• the α-olefin that is a raw material of the ethylene-(α-olefin) copolymer is a non-polarized monomer,
• a melting point of the ethylene-(α-olefin) copolymer is equal to or lower than 70° C.,
• a vinyl-acetate total content of the base polymer is equal to or less than 19 mass %,
• the resin composition contains the ethylene-(α-olefin) copolymer, a content of which is equal to or more than 20 parts by mass and equal to or less than 70 parts by mass per 100 parts by mass of the base polymer, and
• the resin composition contains the metallic hydroxide, a content of which is equal to or more than 30 parts by mass and equal to or less than 150 parts by mass per 100 parts by mass of the base polymer.