| abstract |
Polymerization or copolymerization of at least one olefin with or without up to about 5 mole % of a diolefin in the presence of a catalyust composed of (a) a solid titanium catalyst component containing magnesium, titanium, halogen and an electron donor, which is a reaction product of (iv) a titanium compound in the liquid state and a magnesium-containing solid carrier, said magnesium-containing solid carrier being formed by contacting (i) a magnesium compound in the liquid state not containing a titanium compound with (ii) a precipitant other than a titanium compound in the presence of or absence of (iii) an electron donor, said reaction product being formed by contacting the titanium compound (iv) in the liquid state and the magnesium-containing solid carrier, pro-treated or not pre-treated with the electron donor (iii), in the presence or absence of the electron donor (iii), the electron donor (iii) being used at least once throughout the period of formation of the magnesium-containing solid carrier and the formation of the reaction product, and (b) an organometallic compound of a metal selected from the group consisting of metals of Groups I to III of the periodic table; the improvement wherein said catalyst is composed of (A) a solid titanium catalyst component of (a) in which the electron donor (iii) is an ester selected from the group consisting of polycarboxylic acid esters and polyhydroxy compound esters. (B) the organometallic compound (b), and (C) an organosilicon compound having an Si-O-C or Si-N-C bond in its molecule. |