# US 5,705,579 A · Olefin polymerization

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- Number: US 5,705,579 A
- Document ID: US5705579A
- Status: Granted
- Kind: A
- Application number: 08/682,223
- Filed: 1996-07-17
- Granted: 1998-01-06
- Earliest claimed: 1996-07-17
- Assignees: Phillips Petroleum Company
- Inventors: Gil R. Hawley; Timothy M. Ramsey; Ronald L. Halterman; Darryl R. Fahey
- Web page: https://patentgrep.com/patent/US5705579A

## CPC

- C08F 10/00: Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 4/65925: {two cyclopentadienyl rings being mutually non-bridged}
- C08F 110/06: Propene
- Y10S 526/943: Polymerization with metallocene catalysts
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A catalyst system comprising an unbridged bis(2-aryltetrahydro-indenyl) metallocene and a cocatalyst and its use in the polymerization of olefins, especially olefins having 3 or more carbon atoms.

## Claims

### Claim 1

A process for producing a polymer in which the isotactic microstructure exceeds the atactic microstructure comprising contacting at least one olefin having at least three carbon atoms with a catalyst system prepared by combining a cocatalyst and bis(2-(para-methoxyphenyl) tetrahydroindenyl) zirconium dichloride.

### Claim 2 (depends on 1)

A process according to claim 1 wherein said cocatalyst comprises an alkylaluminoxane.

### Claim 3 (depends on 2)

A process according to claim 2 wherein the polymerization is conducted under particle form conditions such that the end product polymer is insoluble in the polymerization medium.

### Claim 4 (depends on 3)

A process according to claim 3 wherein propylene is polymerized.

### Claim 5 (depends on 4)

A process according to claim 4 wherein said cocatalyst comprises methylaluminoxane.

### Claim 6 (depends on 5)

A process according to claim 5 wherein propylene is homopolymerized.

### Claim 7 (depends on 6)

A process according to claim 6 wherein the polymerization is conducted at a temperature in the range of about 40.degree. C. to about 70.degree. C.

### Claim 8 (depends on 1)

A process according to claim 1 carried out to produce a homopolymer of propylene having a ›mm! as determined from C.sup.13 NMR of at least about 62.8%.

### Claim 9 (depends on 7)

A process according to claim 7 carried out to produce a homopolymer of propylene having a ›mm! as determined from C.sup.13 NMR of at least about 79%.

### Claim 10 (depends on 7)

A process according to claim 7 conducted without the addition of hydrogen.

### Claim 11 (depends on 1)

A process according to claim 1 wherein said cocatalyst comprises a cocatalyst selected from the group consisting of alkylaluminoxanes and triphenyl carbenium tetrakis (pentafluorophenyl) boronate.

### Claim 12 (depends on 2)

A process according to claim 2 wherein said cocatalyst comprises methylaluminoxane.

### Claim 13 (depends on 12)

A process according to claim 12 wherein the polymerization is conducted at a temperature in the range of 40.degree. C. to 70.degree. C.

### Claim 14 (depends on 13)

A process according to claim 13 conducted in the absence of added hydrogen.

### Claim 15

An isotactic stereoselective polymerization process comprising contacting at least one olefin having at least three carbon atoms with a catalyst system prepared by combining bis(2-(para-methoxyphenyl) tetrahydroindenyl) zirconium dichloride and a cocatalyst selected from organo metallic compounds of metals of Groups IA, IIA, and IIB of the Periodic Table.

### Claim 16 (depends on 15)

A process according to claim 15 wherein the cocatalyst comprises an alkylaluminoxane.

### Claim 17 (depends on 15)

A process according to claim 15 wherein the cocatalyst comprises triphenyl carbenium tetrakis (pentafluorophenyl) boronate.