Catalyst system
AssigneeStandard Oil Company (Indiana)
InventorNikolaus K. Balint
Life of this patent
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Abstract
A propylene polymerization catalyst is formed by incorporation into a catalytic mixture, comprising a transition metal compound and an organoaluminum compound, effective amounts of hexavalent sulfur mineral acid or anhydride whereby the amount of n-hexane-soluble polymeric product is decreased.
Claims14
A catalyst composition for the polymerization of propylene or mixtures of propylene and copolymerizable alpha-olefins, which produces low amounts of n-hexane-soluble polymer, comprising a titanium trihalide;
- [an organoaluminum compound selected from the group consisting of dialkyl aluminum halide, trialkyl aluminum, a mixture thereof, and a mixture of trialkyl aluminum with alkyl aluminum dihalide] a dialkyl aluminum halide ;
- and a hexavalent sulfur mineral acid or anhydride in a molar ratio to titanium trihalide from about 0.005 to 1 to about [0.7] 0.5 to 1.
[14. The catalyst composition of claim 3 wherein the titanium trihalide is titanium trichloride and the organoaluminum compound is
- diethylaluminum chloride.] 15. A process for forming a catalyst composition for the polymerization of propylene or mixtures of propylene and copolymerizable alpha-olefins, which produces low amounts of n-hexane-soluble polymer, comprising mixing in a suitable medium a titanium trihalide;
- [an organoaluminum compound selected from the group consisting of dialkyl aluminum halide, trialkyl aluminum, mixtures thereof, and a mixture of trialkyl aluminum with alkyl aluminum dihalide] a dialkyl aluminum halide ;
- and a hexavalent sulfur mineral acid or anhydride in a molar ratio to titanium trihalide from about 0.005 to 1 to about .Badd.[0.7].Baddend. 0.5 to 1. 16. The process of claim 15 wherein the hexavalent sulfur mineral acid is added to a solution of [organoaluminum compound] dialkyl aluminum halide in an inert hydrocarbon then the resulting mixture is added to a mixture of titanium trihalide in an inert
- hydrocarbon. 17. The process of claim 15 wherein the titanium trihalide is titanium trichloride and the [organoaluminum compound is diethyl-aluminum] dialkyl aluminum halide is diethyl aluminum chloride. 18. The process of claim 16 wherein the inert
- hydrocarbon is n-hexane. 19. The process of claim 15 wherein the
- hexavalent mineral acid is sulfuric acid. 20. The process of claim 15
- wherein the hexavalent mineral acid is oleum. 21. The process of claim 15
- wherein the hexavalent mineral anhydride is sulfur trioxide. 22. The process of claim 15 wherein the hexavalent mineral acid is chlorosulfonic acid.
Dependencies are inferred from the claim text.