High efficiency complex catalyst for polymerizing olefins
AssigneeThe Dow Chemical Company
InventorsDonald Earl Gessell, Gaylon Le Roy Dighton, Luis Daniel Valenzuela-Bernal
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Abstract
Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins are provided by mixing a dinitrogen and/or dihydrogen complex of a transition metal such as titanium with a conventional Ziegler catalyst such as the reaction product of titanium tetrachloride and aluminum triethyl. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics.
Claims11
A catalytic mixture of (A) a hydrocarbon soluble complex of a halide of a transition metal (TM1) wherein the complex contains at least one coordinate covalent bond to molecular nitrogen or hydrogen and (B) a conventional Ziegler catalyst comprising a transition metal (TM2) compound selected from the group consisting of halides, oxyhalides, oxides, hydroxides, alcoholates, acetates, benzoates and acetylacetonates;
- and a non-transition metal (M) or a compound of a non-transition metal (M) as a reducing agent, the proportions of the foregoing components of said catalytic mixture being such that the atomic ratio of the transition metal (TM1) of the complex to the transition metal (TM2) of the Ziegler catalyst is within the range from about 0.001:1 to about 1000:1, and the atomic ratio of the metal (M) of the reducing agent to the transition metal of the complex is within the range from about 0.1:1 to about 100:1 and wherein (TM1) and (TM2) are independently selected from groups 4b, 6b, 7b or 8 of Mendeleev's Periodic Table of Elements and (M) is selected from groups 1a, 2a, 2b or 3a of said table.
The catalytic mixture of claim 2 wherein TM1 and TM2 are titanium and the metallic reducing agent is an organoaluminum compound having the formula RAlYY' wherein R is alkyl, Y is alkyl or hydrogen and Y' is alkyl, hydrogen or halogen provided that when Y' is halogen Y is alkyl.
The catalyst of claim 4 wherein the transition metal compounds (TM1) are selected from the group consisting of titanium trichloride, zirconium tetrachloride, tungsten hexachloride, molybdenum pentachloride and nickel dichloride;
- the transition metal compounds (TM2) are selected from titanium trichloride, titanium tetrachloride, tetra(isopropoxy) titanium, tri(isopropoxy)titanium, dibutoxy titanium dichloride and tetraphenoxy titanium and the reducing metal compound is selected from the group consisting of lithium hydride, sodium borohydride trimethylaluminum, triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-pentylaluminum, triisooctylaluminum, tri-n-decylaluminum, tri-n-dodecylaluminum, diethylaluminum chloride, diethylaluminum hydride, butyllithium, amylsodium, phenylsodium, dimethylmagnesium, diethylmagnesium, diethylzinc, butylmagnesium chloride and phenylmagnesium bromide.
The catalytic mixture of claim 5 wherein the atomic ratio of TM1 to TM2 is in the range from about 0.001:1 to 0.101.
The mixture of claim 7 wherein the complex contains a coordinate covalent bond to nitrogen.
The mixture of claim 8 wherein the transition metal halide of the complex is a titanium trichloride.
The mixture of claim 9 wherein the titanium trichloride is a titanium trichloride-aluminum chloride complex.
The mixture of claim 10 wherein the Ziegler catalyst is the reaction product of a titanium trichloride aluminum chloride complex and an aluminum trialkyl wherein alkyl has from 1 to 12 carbon atoms.
Dependencies are inferred from the claim text.