THERMOPLASTIC POLYURETHANE ELASTOMER-BASED COMPOSITION FOR INSULATION LAYERS AND ELECTRIC CABLE EQUIPPED THEREWITH

摘要

Disclosed are a halogen-free insulating composition comprising a thermoplastic polyurethane elastomer and an insulating cable equipped with an insulation layer or sheath layer formed using the composition. The composition comprises a base resin consisting of a thermoplastic polyurethane elastomer and polyolefin grafted with a polar functional group, and a halogen-free inorganic flame-retardant. The standard deviation for the weight loss of a unit section from a thermogravimetric analysis is within 5% of an average weight of unit sections before said ther- mogravimetric analysis, said unit section being a unit section of the insulation layer or sheath layer manufactured from said composition, and the inorganic particles of the residue obtained from dissolving said insulation layer or sheath layer with an organic solvent have an average maximum diameter of 0.5 to 100 µm, 30% or more of said inorganic particles falling within a diameter range of 1.0 to 50 µm.