Composition for high strength loose tube type fiber optic cable with excellent flexibility and impact resistance
Disclosed is a composition for a high strength loose tube type fiber optic cable with excellent flexibility and excellent impact resistance, which includes a polypropylene-polyethylene copolymer having a melt flow index (MFI) of 1.1 g/10 minutes to 3.0 g/10 minutes at 230° C. and a flexural modulus of 10,000 to 23,000 kg/cm 2 . A fiber optic cable including a loose tube formed with the composition for a high strength loose tube type fiber optic cable has excellent flexibility and impact resistance as well as excellent appearance.
1. A loose tube type fiber optic cable, comprising:
a central tensile wire for endowing tensile strength to the optical cable;
a plurality of loose tube optical units arranged to contact the central tensile wire and each having a plurality of optical fibers and a loose tube surrounding the optical fibers;
a reinforcing member surrounding the loose tube optical units; and
a sheath surrounding the reinforcing member,
wherein the loose tube consisting essentially of a polypropylene-polyethylene copolymer having a melt flow index (MFI) of 1.1 g/10 minutes to 3.0 g/10 minutes at 230° C., a flexural modulus of 10,000 to 23,000 kg/cm 2 , and an Izod impact strength of 10 kgf·cm/cm or above, wherein the polypropylene-polyethylene copolymer does not include a nucleating agent.