# US 2014/0155561 A1 · Controlling resin properties in a gas phase polymerization process

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- Number: US 2014/0155561 A1
- Document ID: US20140155561A1
- Status: Published application
- Kind: A1
- Application number: 14/074,785
- Filed: 2013-11-08
- Published: 2014-06-05
- Earliest claimed: 2012-12-03
- Assignees: NOVA Chemicals (International) S.A.
- Applicants: Nova Chemicals (International) S.A.
- Inventors: Victoria Ker; Yan Jiang; Sergio Alejandro Guillen-Castellanos
- Web page: https://patentgrep.com/patent/US20140155561A1

## CPC

- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 4/65916: {supported on a carrier, e.g. silica, MgCl2, polymer}
- C08F 2410/02: Anti-static agent incorporated into the catalyst
- C08F 2420/04: Cp or analog not bridged to a non-Cp X ancillary anionic donor
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Methods for dramatically altering the processability of ethylene copolymers made with a supported phosphinimine polymerization catalyst. The method involves changing the polymerization reactor temperature during the polymerization of ethylene and a least one alpha-olefin when a phosphinimine catalyst which comprises a substituted or unsubstituted indenyl ligand and a phosphinimine type ligand.

## Claims

### Claim 1

A method for altering the stress exponent of an ethylene copolymer, the method comprising polymerizing ethylene and an alpha-olefin in a gas phase reactor with a polymerization catalyst, the polymerization catalyst comprising a phosphinimine catalyst, an inert support, and a cocatalyst; wherein the stress exponent of the ethylene copolymer is altered by changing the temperature in the reactor by at least 1° C.; and wherein the phosphinimine catalyst has the formula: LTi(N═P(t-Bu)3)X2; where L is a substituted or unsubstituted indenyl ligand and X is an activatable ligand.

### Claim 2 (depends on 1)

The method of claim 1, wherein the temperature is increased by an amount which is sufficient to reduce the stress exponent by at least 3%.

### Claim 3 (depends on 1)

The method of claim 1, wherein the temperature is decreased by an amount which is sufficient to increase the stress exponent by at least 3%.

### Claim 4 (depends on 1)

The method of claim 1, wherein the cocatalyst is an alkylaluminoxane compound.

### Claim 5 (depends on 1)

The method of claim 1, wherein the inert support is silica.

### Claim 6 (depends on 1)

The method of claim 1, wherein the alpha-olefin is 1-hexene.

### Claim 7 (depends on 1)

The method of claim 1, wherein the phosphinimine catalyst is (1-C6F5CH2-Ind)Ti(N═P(t-Bu)3)Cl2.

### Claim 8 (depends on 1)

The method of claim 1, wherein the gas phase reactor is a fluidized bed reactor.

### Claim 9 (depends on 1)

The method of claim 1, wherein the temperature is changed by at least 5° C.

### Claim 10 (depends on 1)

The method of claim 1, wherein the polymerization catalyst additionally comprises a catalyst modifier.