| abstract |
The present invention provides a polyolefin resin composition that is excellent in mechanical properties and dimensional stability, and particularly excellent in heat resistance, and is obtained from the polyolefin resin composition, and thus excellent in mechanical properties, dimensional stability and heat resistance, and particularly excellent in meltdown properties. In addition to the above and the above characteristics, the present invention provides a microporous membrane having excellent permeability and shutdown characteristics, and a use thereof. Polyolefin resin composition (C) of this invention is derived from 85-50 mass% of ultrahigh molecular weight polyethylene (A) which has specific intrinsic viscosity, and 4-methyl-1- pentene in 100 mass% of polyolefin resin compositions (C). It is characterized by including 15-50 mass% of polymers (B) containing a repeating unit. |