| 摘要 |
<p>Olefin polymers or copolymers have been prepared using a polymerization catalyst composed of
(A) a solid titanium catalyst component containing magnesium, titanium, halogen and an electron donor and derived from a magnesium-containing solid carrier obtained by contacting a magnesium compound in the liquid state with a precipitant, and
(B) an organometallic compound of a metal of Groups I to III of the periodic table.
<??>According to the invention polymers of high stereo-specificity are produced in the form of free-flowing particles or granules using a highly active catalyst in which the catalyst component (A) is a reaction product of a titanium compound in the liquid state and a magnesium-containing solid carrier,
(I) the magnesium-containing solid carrier being formed by contacting
(i) a magnesium compound in the liquid state having no reducing ability and not containing a tetraalkoxy-, tetracycloalkoxy- or tetraaryloxy-titanium compound, said magnesium compound being selected from a liquid magnesium compound a hydrocarbon solvent solution of a magnesium compound and a magnesium compound in the liquid state obtained by contacting a magnesium compound with an electron donor selected from alcohols, organic carboxylic acids, aldehydes, amines and mixtures thereof, with
(ii) a precipitant other than a titanium compound, and
(ii) the reaction product being formed by reacting a titanium compound (iv) in the liquid state with the magnesium-containing solid carrier from (I); an electron donor (iii) having no active hydrogen being used at least once in (I) and/or (II). </p> |
