Catalyst system for producing ethylene polymers
AssigneePhillips Petroleum Company
InventorDarryl R. Fahey
Life of this patent
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Abstract
A catalyst for producing ethylene polymers in which a first component composed of titanium, vanadium, halogen, and OR groups, wherein R is selected from among alkyl, cycloalkyl, aryl, acyl, and combinations thereof, is combined with an organometallic compound. A method for producing a catalyst system in which an organoaluminum compound component is contacted with a component composition produced by reacting a mixture of titanium and vanadium compounds with an organometallic compound to form a product mixture which is then contacted with titanium tetrachloride. A method for producing polymers of ethylene by contacting ethylene with a catalyst system produced as above under conditions suitable for polymerization.
Claims14
A catalyst useful in conjunction with an organoaluminum compound for producing ethylene polymers, said catalyst comprising a composition of titanium, vanadium, and halogen groups prepared by sequentially treating a mixture of titanium and vanadium compounds with (1) an organometallic compound and (2) titanium tetrachloride wherein said titanium compound is described by the formula Ti(OR).sub.n X.sub.4-n in which R is selected from among alkyl, cycloalkyl, aryl, and acyl groups and combinations thereof;
- each group can contain from 1 to about 20 carbon atoms per molecule;
- n designates 1, 2, 3, or 4;
- and X is bromide, chloride, or iodide and the vanadium compound is VX.sub.4 or VO(OR').sub.m X.sub.3-m in which R' is an alkyl group containing from 1 to about 20 carbon atoms, m is 0 to 3 and X is bromide, chloride or iodide.
A method for producing a catalyst useful in conjunction with an organoaluminum compound for producing ethylene polymers, said method comprising:
- (1) reacting a mixture of a compound of titanium having the formula Ti(OR).sub.n X.sub.4-n in which R is selected from among alkyl, cycloalkyl, aryl, and acyl groups and combinations thereof;
- each group can contain from 1 to about 20 carbon atoms per molecule, n designates 1, 2, 3, or 4;
- and X is bromide, chloride or iodide and a compound of vanadium having the formula VX.sub.4 or VO(OR').sub.m X.sub.3-m in which R' is an alkyl group containing from 1 to about 20 carbon atoms, m is 0 to 3 and X is bromide, chloride or iodide with an organoaluminum compound having the formula AlR".sub.a X.sub.3-a wherein R" is hydrogen or an alkyl or aryl group containing from 1 to about 20 carbon atoms, X' is bromine, chlorine, or iodine or an alkoxy group containing from 1 to about 12 carbon atoms, a is an integer of from 1 to 3, and when X' is alkoxy, a is 2 thereby forming a first product and
- (2) contacting said first product with a titanium tetrachloride to produce a second reaction product.
Dependencies are inferred from the claim text.