Olefin polymerization catalyst
First Claim
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1. A solid, hydrocarbon-insoluble alpha-olefin polymerization catalyst component comprises a product formed by:
- A. forming a solution of a magnesium-containing species from a magnesium carbonate or a magnesium carboxylate;
B. precipitating solid particles from such magnesium-containing solution by treatment with a transition metal halide and an organosilane having a formula;
Rn SiR'"'"'4"n, wherein n=0 to 4 and wherein R is hydrogen or an alkyl, a haloalkyl or aryl radical containing one to about ten carbon atoms or a halosilyl radical or haloalkylsilyl radical containing one to about eight carbon atoms, and R, or a halogen;
C. reprecipitating such solid particles from a mixture containing a cyclic ether; and
D. treating the reprecipitated particles with a transition metal compound and an electron donor.
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Abstract
A solid hydrocarbon-insoluble, alpha-olefin polymerization catalyst component with superior activity, stereospecificity and morphology characteristics comprises the product formed by (A) forming a solution of a magnesium-containing species from a magnesium carbonate or a magnesium carboxylate; (B) precipitating solid particles from such magnesium-containing solution by treatment with a transition metal halide and an organosilane; (C) reprecipitating such solid particles from a mixture containing a cyclic ether; and (D) treating the reprecipitated particles with a transition metal compound and an electron donor.
128 Citations
30 Claims
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1. A solid, hydrocarbon-insoluble alpha-olefin polymerization catalyst component comprises a product formed by:
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A. forming a solution of a magnesium-containing species from a magnesium carbonate or a magnesium carboxylate; B. precipitating solid particles from such magnesium-containing solution by treatment with a transition metal halide and an organosilane having a formula;
Rn SiR'"'"'4"n, wherein n=0 to 4 and wherein R is hydrogen or an alkyl, a haloalkyl or aryl radical containing one to about ten carbon atoms or a halosilyl radical or haloalkylsilyl radical containing one to about eight carbon atoms, and R, or a halogen;C. reprecipitating such solid particles from a mixture containing a cyclic ether; and D. treating the reprecipitated particles with a transition metal compound and an electron donor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 25, 26, 28, 29, 30)
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10. A solid, hydrocarbon-insoluble alpha-olefin polymerization catalyst component comprises a product formed by:
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A. forming a solution in an alcohol medium of a magnesium containing species formed from a magnesium alkoxide and carbon dioxide. B. precipitating solid particles from such magnesium-containing solution by treatment with a titanium halide and an organosilane having a formula;
Rn SiR'"'"'4-n wherein n=0 to 4 and wherein R is hydrogen or an alkyl, a haloalkyl or aryl radical containing one to about ten carbon atoms of a halosilyl radical or haloalkylsilyl radical containing one to about eight carbon atoms, and R, is OR or a halogen;C. reprecipitating such solid particles from a mixture containing a cyclic ether; and D. treating the reprecipitated particles with a Ti(IV) compound and then with a mixture of a Ti(IV) compound and an electron donor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 27)
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19. A solid, hydrocarbon-insoluble alpha-olefin polymerization catalyst comprises a product formed by precipitating solid particles from a magnesium hydrocarbyl carbonate solution in an alcohol by treatment with titanium tetrachloride and an organosilane having a formula:
- Rn SiR'"'"'4-n, wherein n=1 to 4 and wherein R is hydrogen or an alkyl, a haloalkyl or aryl radical containing one to about ten carbon atoms or a halosilyl radical or haloalkylsilyl radical containing one to about eight carbon atoms, and R, is OR or a halogen and treating the resulting solid particles with titanium tetrachloride and an electron donor.
- View Dependent Claims (20, 21, 22, 23, 24)
Specification