| 摘要 |
<p>A process for producing a propylene polymer or copolymer which comprises polymerizing (a) propylene or (b) a mixture of propylene and another unsaturated hydrocarbon monomer in liquid propylene in the presence of a catalyst system of (A) a specified titanium trichloride composition obtained by reducing titanium tetrachloride with an organoaluminum compound and activating the product; (B) an organoaluminum compound having the general formula R2AlX wherein R represents an alkyl group or an aralkyl group, each containing up to 18 carbon atoms, and X represents a halogen atom; and (C) an unsaturated carboxylic acid ester; while adjusting the amount of the polymer produced to at least 8,000 g per gram of the titanium trichloride composition.</p> |
