Olefin polymerization catalyst
First Claim
1. An olefin polymerization catalyst component precursor consisting of a solution of a complex alkoxide compound of the formula
wherein OR independently is alkoxide of up to four carbon atoms inclusive and x is a monovalent anion of a phenolic compound wherein m is 0.5 to 2, p is greater than zero and less than or equal to 2, and n equals 6 plus 4 m minus p.6.
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Accused Products
Abstract
Improved lower α-olefin polymerization catalysts are produced from an organoaluminum cocatalyst, a selectivity control agent and a specified magnesium-containing, titanium-containing, halide-containing procatalyst. The procatalyst is produced from an electron donor, tetravalent titanium halide and a complex alkoxide compound formed from magnesium alkoxide, titanium alkoxide and a phenolic compound. The catalyst is utilized produce poly-α-olefin in good yield, which polymer is characterized by a relatively low xylene solubles content and a relatively high bulk density.
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Citations
27 Claims
- 1. An olefin polymerization catalyst component precursor consisting of a solution of a complex alkoxide compound of the formula
- space="preserve" listing-type="equation">Mg.sub.3 Ti.sub.m (OR).sub.n X.sub.p
wherein OR independently is alkoxide of up to four carbon atoms inclusive and x is a monovalent anion of a phenolic compound wherein m is 0.5 to 2, p is greater than zero and less than or equal to 2, and n equals 6 plus 4 m minus p.6. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
- 3. The component precursor of claim 2 wherein each OR is ethoxide.
- 4. The precursor of claim 3 wherein each X is o-cresylate.
- 5. An olefin polymerization catalyst component which consists essentially of the product of contacting the catalyst precursor of claim 1 with a tetravalent titanium halide and an electron donor.
- 6. The component of claim 5 wherein the tetravalent titanium halide is a titanium tetrahalide.
- 7. The component of claim 6 wherein the electron donor is an ester of an aromatic monocarboxylic or dicarboxylic acid.
- 8. The component of claim 7 wherein the titanium tetrahalide is titanium tetrachloride.
- 9. The component of claim 8 wherein the electron donor is an alkyl ester of an aromatic monocarboxylic acid.
- 10. The component of claim 9 wherein the ester is ethyl benzoate.
- 11. The component of claim 8 wherein the electron donor is an alkyl ester of an aromatic dicarboxylic acid.
- 12. The component of claim 11 wherein the ester is diisobutyl phthalate.
- 13. An olefin polymerization catalyst obtained by contacting the catalyst component of claim 4 with an organoaluminum cocatalyst and a selectivity control agent.
- 14. The catalyst of claim 13 wherein the cocatalyst is halide-free.
- 15. The catalyst of claim 14 wherein the cocatalyst is a trialkylaluminum.
- 16. The catalyst of claim 15 wherein the selectivity control agent is an ester of an aromatic monocarboxylic or dicarboxylic acid or an organosilane of the formula
- space="preserve" listing-type="equation">R'"'"'.sub.r Si(OR).sub.4-r
wherein R'"'"' is aryl or alkyl, R is alkyl of up to 4 carbon atoms inclusiive and r is 1 or 2.
- C. to about 110°
C. and a pressure sufficient to maintain the reaction mixture in a non-gaseous state in inert diluent.
Specification