Olefin polymerization catalyst
First Claim
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1. In the process of polymerizing lower α
- -olefin by contacting lower α
-olefin under polymerization conditions in the presence of an olefin polymerization catalyst formed from a titanium-based procatalyst, an organoaluminum cocatalyst and a selectivity control agent, the improvement of using as the procatalyst the olefin polymerization procatalyst produced by contacting an olefin procatalyst precursor obtained by heating a reaction mixture consisting essentially of a magnesium alkoxide wherein the alkoxide moieties independently have up to 4 carbon atoms inclusive, a titanium alkoxide wherein the alkoxide moieties independently have up to 4 carbon atoms inclusive, a titanium halide, a phenolic compound selected from phenol or phenol substituted with a group free from active hydrogen atoms which is ortho-para directing for aromatic ring substitution and an alkanol and removing alkanol from the resulting liquid mixture, with a tetravalent titanium halide, a halohydrocarbon and an electron donor.
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Abstract
An improved olefin polymerization process employs an olefin polymerization catalyst produced from a polymerization procatalyst made from a magnesium alkoxide, a titanium tetraalkoxide, a tetravalent titanium halide, a phenolic compound and an alkanol. The procatalyst precursor is contacted with a tetravalent titanium halide and an electron donor to form the procatalyst which is subsequently converted to the olefin polymerization catalyst by contact with a cocatalyst and a selectivity control agent.
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Citations
11 Claims
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1. In the process of polymerizing lower α
- -olefin by contacting lower α
-olefin under polymerization conditions in the presence of an olefin polymerization catalyst formed from a titanium-based procatalyst, an organoaluminum cocatalyst and a selectivity control agent, the improvement of using as the procatalyst the olefin polymerization procatalyst produced by contacting an olefin procatalyst precursor obtained by heating a reaction mixture consisting essentially of a magnesium alkoxide wherein the alkoxide moieties independently have up to 4 carbon atoms inclusive, a titanium alkoxide wherein the alkoxide moieties independently have up to 4 carbon atoms inclusive, a titanium halide, a phenolic compound selected from phenol or phenol substituted with a group free from active hydrogen atoms which is ortho-para directing for aromatic ring substitution and an alkanol and removing alkanol from the resulting liquid mixture, with a tetravalent titanium halide, a halohydrocarbon and an electron donor. - View Dependent Claims (2, 3, 4, 5, 6)
- -olefin by contacting lower α
- 7. In the process of polymerizing propylene by contacting propylene under polymerization conditions in the presence of an olefin polymerization catalyst formed from a titanium-based procatalyst, an organoaluminum cocatalyst and a selectivity control agent, the improvement of using as procatalyst the olefin polymerization procatalyst produced by contacting an olefin polymerization procatalyst precursor obtained by heating a reaction mixture consisting essentially of magnesium ethoxide, titanium ethoxide, titanium tetrachloxide, a phenolic compound selected from phenol or phenol substituted by alkyl, alkoxy, halo or dialkylamino and ethanol and removing ethanol from the resulting liquid mixture, with titanium tetrachloride, a halohydrocarbon and an alkyl ester of an aromatic monocarboxylic or dicarboxylic acid.
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