Abstract: A polypropylene for an electric material has a melt flow rate of 0.1 to 30 g/10 min., a mesopentad fraction calculated from a 13C-NMR spectrum of 0.90 to 0.99, and a firing residue of 50 ppm by weight or less based on the polypropylene, a titanium content and an iron content which are detected from the firing residue, of 1 ppm by weight or less and 0.1 ppm or less, respectively, based on the polypropylene, and the chlorine content of 5 ppm by weight or less based on the polypropylene. The above polypropylene exhibits excellent electric insulation and has a roughened surface when it is formed into a film, and thus the polypropylene can be suitably used for a capacitor film without using an additive such as a ? crystal nucleating agent. The polypropylene is also useful as a material of a film for coating an electric wire and a material for an instrument for conveying an electronic material.

Abstract: A polypropylene for an electric material has a melt flow rate of 0.1 to 30 g/10 min., a mesopentad fraction calculated from a 13C-NMR spectrum of 0.90 to 0.99, and a firing residue of 50 ppm by weight or less based on the polypropylene, a titanium content and an iron content which are detected from the firing residue, of 1 ppm by weight or less and 0.1 ppm or less, respectively, based on the polypropylene, and the chlorine content of 5 ppm by weight or less based on the polypropylene. The above polypropylene exhibits excellent electric insulation and has a roughened surface when it is formed into a film, and thus the polypropylene can be suitably used for a capacitor film without using an additive such as a ? crystal nucleating agent. The polypropylene is also useful as a material of a film for coating an electric wire and a material for an instrument for conveying an electronic material.