To provide a catalyst system that can manufacture ethylene copolymer having a sharp composition distribution and solid performances such as impact strength, environmental stress crack resistance(ESCR) or the like, without using a large volume of electron-donative compounds like a conventional method.
A manufacturing method of (1) a powdery solid catalyst component containing magnesium compound (M), titanium compound (T), if necessary, an electron-donative compound (D) and/or organic aluminium compound (A) and the particles diameter of which is 30 μm or less are 95% or more and (2) a catalyst system for copolymerization of ethylene that consists the solid catalyst component and organic aluminium compound, and (3) ethylene copolymer using the catalyst system are provided.
YAMAMOTO MASAKAZU
ISHIDA KIYOTAKA
KONO SUNAO
MONOI HISASHI
