# US 7,745,557 B2 · Polymers having broad molecular weight distributions and methods of making the same

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- Number: US 7,745,557 B2
- Document ID: US7745557B2
- Status: Granted
- Kind: B2
- Application number: 11/929,448
- Filed: 2007-10-30
- Published: 2008-02-28
- Granted: 2010-06-29
- Earliest claimed: 2004-04-22
- Assignees: Chevron Phillips Chemical Company LP
- Inventors: Max P. McDaniel; Elizabeth A. Benham; Steven J. Secora; Michael D. Jensen; Kathy S. Collins
- Web page: https://patentgrep.com/patent/US7745557B2

## CPC

- C08F 10/00: Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Methods of polymerizing at least one olefin include contacting the olefin with a catalyst comprising chromium and with a cocatalyst comprising a non-transition metal cyclopentadienyl (Cp) compound. The polymerization may be performed in the presence of hydrogen. Using the cocatalyst in conjunction with the catalyst increases several properties, such as the high load melt index (HLMI), the MW, and the MN, of the polymers produced by this polymerization method. Polymer compositions produced by such methods have various unique properties, including a PDI greater than about 30. Additional embodiments include articles of manufacture or end use articles formed from such polymer compositions.

## Claims

### Claim 1

A polymer composition having a weight average molecular weight (MW) greater than about 100,000 g/mol, a high load melt index (HLMI) in a range of from about 4 g/10 mm to about 15 g/10 mm, a Charpy impact energy greater than about 100 J/m and a zero shear viscosity (Eo) less than about 107 Pa·s.

### Claim 2 (depends on 1)

The polymer composition of claim 1 having a melt index (MI) in a range of from about 0.01 g/10 mm to about 10 g/10 mm.

### Claim 3 (depends on 1)

The polymer composition of claim 1, wherein the MW is greater than about 250,000 g/mol.

### Claim 4 (depends on 1)

The polymer composition of claim 1, wherein the MW is greater than about 400,000 g/mol.

### Claim 5 (depends on 1)

The polymer composition of claim 1, wherein the MW is greater than about 500,000 g/mol.

### Claim 6 (depends on 1)

The polymer composition of claim 1, wherein the MW is greater than about 600,000 g/inol.

### Claim 7 (depends on 1)

The polymer composition of claim 1, wherein the Eo is greater than about 5×105 Pa·s.

### Claim 8

A polymer composition having a rheological breadth parameter greater than about 0.15 and a PDI greater than about 20.

### Claim 9 (depends on 8)

The polymer composition of claim 8, wherein the polydispersity index (PDI) is greater than about 30.

### Claim 10 (depends on 8)

The polymer composition of claim 8, wherein the PDI is greater than about 40.

### Claim 11 (depends on 8)

The polymer composition of claim 8, wherein the PDI is greater than about 50.

### Claim 12 (depends on 8)

The polymer composition of claim 8, wherein the PDI is greater than about 70.

### Claim 13 (depends on 8)

The polymer composition of claim 8, wherein the PDI is greater than about 90.

### Claim 14 (depends on 1)

The polymer of claim 1, wherein the polymer has a Charpy critical temperature of less than about −15° C.