Process for preparing polyolefins

Claim 1

Process for preparing polyolefins by polymerizing or copolymerizing olefins using a catalyst prepared from a component with a transition metal compound supported on a solid carrier and an organoaluminum compound and/or an organozinc compound, said transition metal compound being selected from the group consisting of titanium tetrachloride, ethoxytitanium trichloride, diethoxytitanium dichloride, dibutoxytitanium dichloride, phenoxytitanium trichloride, vanadium tetrachloride and vanadium oxychloride, said solid carrier comprising a member selected from the group consisting of a reaction product A obtained by reacting (1) an organic dicarboxylate salt of magnesium represented by the general formula Mg(OOCR) 2 wherein R is an aliphatic, aromatic or alicyclic having 2 to 32 carbon atoms and (2) an aluminum compound selected from the group consisting of aluminum trimethoxide, aluminum triethoxide aluminum tri-n-propoxide, aluminum triisopropoxide, aluminum tri-n-butoxide, aluminum tri-sec-butoxide, aluminum tri-t-butoxide and aluminum triphenoxide, at a temperature in the range from 50° to 500° C. for a period of time in the range from 1 to 30 hours, the molar ratio of said aluminum compound to said organic dicarboxylate salt of magnesium ranging from 1.6:1 to 4:1, and a reaction product B obtained by treating said reaction product A with a halogenating agent selected from the group consisting of molecular halogens, non-metallic halides, non-metallic oxyhalides, metal halides and organometallic halides at a temperature in the range from room temperature to 400° C. for a period of time in the range from 1 minute to 24 hours.