POLYPROPYLENE RESIN COMPOSITION FOR MICROPOROUS FILM FORMATION

摘要

[Object] To provide a polypropylene resin composition for use in the formation of a microporous membrane having excellent heat resistance and strength. [Solution] A polypropylene resin composition for use in the formation of a microporous membrane according to the present invention comprises as an essential component an ultra-high-molecular-weight propylene homopolymer (A) that satisfies the following requirements (1) to (4):
(1) the intrinsic viscosity [·] is 7 dl/g or more and less than 25 dl/g;
(2) the mesopentad fraction ranges from 90.0% to 99.5%;
(3) the melting point ranges from 153°C to 167°C; and
(4) in an elution temperature-elution volume curve measured by temperature-rising elution fractionation (TREF), the maximum peak has a peak top temperature in the range of 116°C to 125°C and a half-width of 7.0°C or less.