SOLID CATALYST INGREDIENT AND CATALYST EACH FOR OLEFIN POLYMERIZATION AND PROPYLENE BLOCK COPOLYMER

摘要

A catalyst for olefin polymerization which comprises: a solid catalyst ingredient for olefin polymerization which contains magnesium, titanium, and halogen atoms, has been morphologically regulated so as to have an average particle diameter, specific surface area, and pore volume in respective specific ranges and a pore size distribution in which the cumulative volume of pores having a diameter of 100 ANGSTROM or shorter exceeds 50%; an organoaluminum compound; and an organosilicon compound. When this catalyst is used in propylene/ethylene copolymerization, an ethylene/propylene copolymer serving as a rubber ingredient can be incorporated in a high proportion and in a highly dispersed state into a propylene polymer. Thus, a propylene block copolymer having a satisfactory balance between rigidity and impact resistance can be produced. The copolymer is extremely useful especially in applications such as automotive parts, e.g., bumpers, and parts for domestic electrical appliances.