Claims
- 1. An olefin polymerization procatalyst precursor used in producing a high activity catalyst obtained by contacting at an elevated temperature in the presence of an inert diluent:
- (a) a carbonated magnesium alkoxide of the general formula ##STR6## wherein R is a hydrocarbyl group having up to 12 carbon atoms and x is a number from about 0.1 to about 2; and
- (b) at least one halogenating compound selected from the group consisting of non-transition metal halogenated compounds which are aluminum trichloride and tin tetrachloride, and non-metallic halogenated compounds which are thionyl chloride, hydrogen chloride, oxalyl chloride, carbonyl chloride, boron trichloride, phosphorous oxychloride, and carbon tetrachloride.
- 2. The procatalyst precursor according to claim 1, wherein the carbonated magnesium alkoxide is carbonated magnesium ethoxide.
- 3. The procatalyst precursor of claim 2 wherein the inert diluent is a hydrocarbon, halohydrocarbon, or mixtures thereof.
- 4. An olefin procatalyst obtained by contacting a tetravalent titanium halide, an electron donor, and a procatalyst precursor obtained by contacting at an elevated temperature in the presence of an inert diluent:
- (a) a carbonated magnesium alkoxide of the general formula ##STR7## wherein R is a hydrocarbyl group having up to 12 carbon atoms and x is a number from about 0.1 to about 2; and
- (b) at least one halogenating compound selected from the group consisting of non-transition metal halogenated compounds which are aluminum trichloride and tin tetrachloride, and non-metallic halogenated compounds which are thionyl chloride, hydrogen chloride, oxalyl chloride, carbonyl chloride, boron trichloride, phosphorus oxychloride, and carbon tetrachloride.
- 5. The procatalyst according to claim 4 wherein the carbonated magnesium alkoxide is carbonated magnesium ethoxide.
- 6. The procatalyst of claim 4 wherein the tetravalent titanium halide, electron donor and procatalyst precursor are contacted in the presence of an inert diluent.
- 7. The procatalyst of claim 6 wherein the diluent is a hydrocarbon, halohydrocarbon, or mixtures thereof.
- 8. The procatalyst of claim 7 wherein the inert diluent is a halohydrocarbon.
- 9. An olefin polymerization catalyst produced by contacting the procatalyst of claim 4 with an organoaluminum cocatalyst and a selectivity control agent.
- 10. An olefin polymerization catalyst produced by contacting the procatalyst of claim 6, an organoaluminum cocatalyst and a selectivity control agent.
- 11. The olefin polymerization catalyst of claim 9 wherein the selectivity control agent is an ester of an aromatic monocarboxylic or dicarboxylic acid or an organosilane compound of the formula
- R'.sub.r Si(OR).sub.4-r
- wherein R' is alkyl or aryl of up to 12 carbon atoms, R is lower alkyl of up to 4 carbon atoms, and r is 0 to 3.
- 12. The olefin polymerization catalyst of claim 11 wherein the selectivity control agent is an organosilane.
- 13. The olefin polymerization catalyst of claim 12 wherein the organosilane is diisobutyldimethoxysilane.
- 14. The olefin polymerization catalyst of claim 12 wherein the organosilane is n-propyltrimethoxysilane.
Parent Case Info
This is a continuation of application Ser. No. 07/969,652, filed Oct. 30, 1992, now abandoned.
US Referenced Citations (15)
Continuations (1)
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Number |
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969652 |
Oct 1992 |
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