Process for producing polymers or copolymers of olefins containing at least 3 carbon atoms

摘要

A process for producing a polymer or copolymer of an olefin containing at least 3 carbon atoms which comprises polymerizing or copolymerizing at least one olefin containing at least 3 carbon atoms, or copolymerizing the olefin with up to 10% mole of ethylene and/or a diolefin, in the presence of a catalyst composed of (A) a magnesium-containing solid titanium composition and (B) an organometallic compound of a metal of Groups I to III of the periodic table; characterized in that the solid titanium composition (A) is a composition formed by contacting (i) a halogen-containing magnesium organo-aromatic compound of the formula Mg(OR)nX2-n wherein R represents an aryl or aralkyl group and n is a positive number of 0<n<2, (ii) an organic acid ester, and (iii) a titanium compound in the absence of mechanical pulverization.