Process for preparing polyolefin
AssigneeMitsubishi Chemical Industries Limited
InventorsGenjiro Kakogawa, Masayoshi Hasuo, Yoshinori Suga, Hisashi Kitada
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Abstract
In a process for preparing polyolefin by polymerizing an olefin in the presence of a catalyst system combining an organoaluminum compound and a titanium-containing solid catalytic component prepared by mixing (a) water and/or a hydroxy compound, (b) a Grignard reagent and (c) a titanium tetrahalide, the components (a) (b) or (c) or the reaction mixture of two or three components thereof is contacted with (d) one or more electron donor selected from the group consisting of amines, carboxylic acid amides, phosphines, phosphine oxides, phosphoric esters, phosphorous esters, phosphoric acid amides, ketones and carboxylic esters. The polyolefin having high isotactic index can be obtained.
Claims7
A process for preparing polyolefins by polymerizing an .alpha.-olefin or a mixture of .alpha.-olefin in the presence of a catalyst system prepared by combining:
- (i) an aluminum-free, titanium-containing, solid catalytic component prepared by contacting an ether suspension of amorphous magnesium hydroxyhalide prepared by reacting (a) water with (b) a Grignard reagent having the formula R'MgX wherein R' is a hydrocarbon moiety and X is a halogen atom at a temperature of from 20.degree. to 200.degree. C. and (d) a carboxylic ester with (c) titanium tetrachloride at a temperature of from 60.degree. to 200.degree. C.;
- with
- (ii) an organoaluminum compound.
Dependencies are inferred from the claim text.