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US 5,470,811 AGranted
Polymerization catalysts, their production and use
AssigneeExxon Chemical Patents Inc.
InventorsMoses O. Jejelowo, Robert L. Bamberger
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Abstract
The invention generally relates to a catalyst, particularly a metallocene catalyst and catalyst system useful in the polymerization of olefins into a polymer product. The polymer product has a broad molecular weight distribution, a high molecular weight and a narrow composition distribution and is easily processable.
Claims34
A catalyst for polymerizing olefins comprising:
- a) a first component comprising at least one transition metal of Group IV, V or VI and bonded to at least two cyclopentadienyl containing rings, said rings each having at least two substituents bonded to each of said rings in the same position;
- b) a second component comprising said transition metal and said cyclopentadienyl containing rings, said rings each having at least two substituents bonded to each of said rings;
- wherein the substituents of said first and second components are the same and said substituents of said first and second components are bonded to said rings in different positions;
- and
- c) a third component comprising said transition metal bonded to said cyclopentadienyl containing rings where one of said rings is substituted identically as said first component and another of said rings is substituted identically as said second component.
2 more elements
A catalyst for polymerizing olefins, said catalyst comprising:
- a mixture of components, each component comprising first and second cyclopentadienyl containing rings bonded to a transition metal of Group IV, V or VI, each of said rings being substituted by at least two substituents, said substituents being the same or different, wherein the two cyclopentadienyl containing rings of said first component being identical;
- and the two cyclopentadienyl containing rings of said second component being identical and being an isomer of said first component;
- and at least one other component having said substituents bonded to said first ring in the same position as said first component and said substituents bonded to said second ring in the same position as said second component.
A catalyst system for the polymerization of olefins comprising:
- a) a metallocene catalyst comprising
- (i) a first component comprising at least one transition metal of Group IV, V or VI and bonded thereto at least two cyclopentadienyl containing rings, said rings each having at least two substituents bonded to each of said rings in the same position;
- (ii) a second component comprising said transition metal and said cyclopentadienyl containing rings, said rings each having at least two substituents bonded to each of said rings;
- wherein the substituents of said first and second components are the same and said substituents of said first and second components are bonded to said rings in different positions;
- (iii) a third component comprising said transition metal bonded to said cyclopentadienyl containing tings where one of said rings is substituted identically as said first component and another of said rings is substituted identically as said second component;
- and
- b) a cocatalyst or activator.
4 more elements
Dependencies are inferred from the claim text.