Supported polymerization catalyst
First Claim
1. A catalyst component comprising the product formed by the steps of:
- (a) contacting silica with at least one hydrocarbon soluble magnesium-containing compound;
(b) contacting the product of said step (a) with components (1) and (2) in random order, component (1) being A heterocyclic fused ring compound substituted with at least one oxygen atom and component (2) being a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides and mixtures thereof, with the proviso that the molar ratio of said hydrocarbon soluble magnesium-containing compound to said heterocyclic fused ring compound is at least about 4;
1; and
(c) contacting the product of said step (b) with a first titanium-containing compound having the structural formula TiXm (OR)n, where X is halogen;
R is hydrocarbyl;
m is an integer of 1 to 4; and
n is 0 or an integer of 1 to 3, with the proviso that the sum of m and n is 4.
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Abstract
A catalyst component useful in the polymerization of olefins is disclosed. The catalyst component comprises the product obtained by steps of (a) contacting silica with at least one hydrocarbon soluble magnesium-containing compound; (b) contacting the product of step (a) with component (1), a heterocyclic fused ring compound substituted with at least one oxygen atom, and component (2), a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides and mixtures thereof, with the proviso that components (1) and (2) be present such that the molar ratio of component (2) to component (1) is at least about 4:1; and (c) contacting the product of step (b) with a titanium-containing compound having the structural formula TiXm (OR)n, where X is halogen; R is hydrocarbyl; m is an integer of 1 to 4; and n is 0 or an integer of 1 to 3 with the proviso that the sum of m and n is 4. A catalyst system, used in the polymerization of alpha-olefins, which comprises the catalyst component of this disclosure, an aluminum-containing compound and a silane compound is also taught. Finally, a process for the polymerization of alpha-olefins, utilizing the catalyst system of the present disclosure, is described.
39 Citations
27 Claims
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1. A catalyst component comprising the product formed by the steps of:
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(a) contacting silica with at least one hydrocarbon soluble magnesium-containing compound; (b) contacting the product of said step (a) with components (1) and (2) in random order, component (1) being A heterocyclic fused ring compound substituted with at least one oxygen atom and component (2) being a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides and mixtures thereof, with the proviso that the molar ratio of said hydrocarbon soluble magnesium-containing compound to said heterocyclic fused ring compound is at least about 4;
1; and(c) contacting the product of said step (b) with a first titanium-containing compound having the structural formula TiXm (OR)n, where X is halogen;
R is hydrocarbyl;
m is an integer of 1 to 4; and
n is 0 or an integer of 1 to 3, with the proviso that the sum of m and n is 4. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 25)
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16. A catalyst component comprising the product formed by the steps of:
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(a) contacting silica, said silica being at least 90% by weight pure silica, with a hydrocarbon soluble magnesium-containing compound selected from the group consisting of dihyhydrocarbyloxymagnesium compounds, hydrocarbyloxymagnesium halides and mixtures thereof; (b) contacting the product of said step (a) with (1) a heterocyclic fused ring compound substituted with at least one oxygen atom; and (2) a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides and mixtures thereof; said components (1) and (2) contacting the product of said step (a) in random order; and
said hydrocarbon soluble magnesium-containing compound and said heterocyclic fused ring compound being present in a concentration such that the molar ratio of said hydrocarbon soluble magnesium-containing compound to said heterocyclic fused ring compound is at least about 5;
1; and(c) contacting the product of said step (b) with a first titanium-containing compound having the structural formula TiXm (OR)n, where X is chlorine or bromine;
R is hydrocarbyl;
m is an integer of 2 to 4; and
n is 0 or an integer of 1 or 2, with the proviso that the sum of m and n is 4. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 26, 27)
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Specification