ELECTRIC-WIRE CABLE EQUIPPED WITH FOAMED INSULATOR
There is provided an electric-wire cable equipped with a foamed insulator, the foamed insulator molded on an outer periphery of a metal conductor by a physical foaming method, in which: the foamed insulator is made of a blend of crystalline polymer A with polymer B; and the crystal melting point or glass transition temperature of the polymer B is between the crystal melting point of the crystalline polymer A and a temperature 50° C. lower than the crystal melting point of the crystalline polymer A.
1 . An electric-wire cable equipped with a foamed insulator, the foamed insulator molded on an outer periphery of a metal conductor by a physical foaming method, wherein:
the foamed insulator is made of a blend of crystalline polymer A and polymer B; and
crystal melting point or glass transition temperature of the polymer B is between crystal melting point of the crystalline polymer A and a temperature 50° C. lower than the crystal melting point of the crystalline polymer A.
2 . The electric-wire cable equipped with a foamed insulator according to claim 1 , wherein
content of the polymer B is 0.1 to 45 weight % with regard to the total amount of the crystalline polymer A and the polymer B.
3 . The electric-wire cable equipped with a foamed insulator according to claim 1 , wherein
the crystalline polymer A is polyethylene and the polymer B has a polystyrene block.
4 . The electric-wire cable equipped with a foamed insulator according to claim 1 , wherein
a chemical foaming agent is not contained.