| 摘要 |
PURPOSE: To obtain excellent electric characteristics by drawing monoaxially or bi-axially a polypropylene wherein a value of isotactic pentad content ratio or syndiotactic pentad content ratio of a boiling heptane soluble content measured with<13> C-NMR is at least a specified value. CONSTITUTION: A film for condenser is obtained by drawing monoaxially or bi-axially a polypropylene wherein a value of isotactic pentad content ratio or syndiotactic pentad content ratio of a boiling heptane soluble content measured with<13> C-NMR is at least 0.5. Such propylene the boiling heptane soluble content of which is actually not of an atactic structure is obtained by polymerizing propylene by using a homogeneous catalyst consisting of a metallocene compound and a co-catalyst. A polypropylene oriented film can be obtained by drawing monoaxially or bi-axially a raw fabric sheet obtained by adding respectively additives, for example, a heat stabilizer, an antioxidant, etc., as occasion demands, and extruding by melting. |
