Resin composition, method of making it and electrical wire covered with it

摘要

The resin composition contains (a) 30 - 80 parts by weight of a polyolefin thermoplastic elastomer, (b) 1 - 2 parts by weight of a polypropylene modified with 0.1 - 10% by weight of an acid anhydride, (c) 5 - 50 parts by weight of a styrene-based polymeric elastomer, and (d) 10 - 30 parts by weight of a propylene polymer having a melt flow rate of 0.1 - 5 g/10 min, the total of the components (a), (b), (c) and (d) being 100 parts by weight, and (e) 30 - 200 parts by weight of a metal hydroxide. Optionally a silicone oil is included. This halogen-free olefin-based resin composition has a good balance of properties such as wear resistance, flame resistance, tensile property and flexibility, which are required for the covering material of an electrical wire for an automobile.