# US 10,870,719 B2 · Polymer flow index modifier

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- Number: US 10,870,719 B2
- Document ID: US10870719B2
- Status: Granted
- Kind: B2
- Application number: 16/094,555
- Filed: 2017-04-17
- Published: 2019-04-25
- Granted: 2020-12-22
- Earliest claimed: 2016-04-20
- Assignees: Univation Technologies, LLC
- Applicants: Univation Technologies, LLC
- Inventors: Charles D. Lester; Mark G. Goode; Timothy R. Lynn; Kevin J. Cann; John H. Moorhouse; William Albert Matthews; Kefu Sun; Francois Alexandre
- Web page: https://patentgrep.com/patent/US10870719B2

## CPC

- C08F 210/02: Ethene
- C08F 2/38: Polymerisation using regulators, e.g. chain terminating agents {, e.g. telomerisation}
- C08F 4/69: Chromium, molybdenum, tungsten or compounds thereof
- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08K 3/00: Use of inorganic substances as compounding ingredients
- C08K 5/01: Hydrocarbons {(C08K5/0091 takes precedence)}
- C08F 2/34: Polymerisation in gaseous state
- C08F 2410/06: Catalyst characterized by its size
- C08F 2500/12: Melt flow index or melt flow ratio
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Embodiments of the present disclosure are directed towards method for modifying a polymer flow index. As an example, a method for modifying a polymer flow index can include providing monomers to a polymerization reactor, providing a chromium catalyst to the polymerization reactor, and providing an active amount of a flow index modifier to the polymerization reactor, wherein the flow index modifier is selected from carbon dioxide, carbon monoxide, 2,4-hexadiene, and combinations thereof.

## Claims

### Claim 1

A method for modifying a polymer flow index, comprising:
providing monomers to a polymerization reactor;
providing a chromium catalyst to the polymerization reactor; and
providing an active amount of a flow index modifier to the polymerization reactor, wherein the flow index modifier is carbon dioxide and is from 15.00 parts per million to 50.00 parts per million based upon the monomers and wherein providing the active amount of the flow index modifier forms a polymer having a density that is reduced as compared to a second polymer having a different density, where the second polymer is formed by a same polymerization process, but without utilizing the active amount of the flow index modifier.

### Claim 2 (depends on 1)

The method of claim 1, wherein, providing an active amount of the flow index modifier to the polymerization reactor forms a polymer having a polymer flow index that is reduced as compared to a second polymer having a different polymer flow index, where the second polymer is formed by a same polymerization process, but without utilizing an active amount of the flow index modifier.

### Claim 3 (depends on 2)

The method of claim 2, wherein, the polymer flow index is reduced from about 5% to about 50% as compared to the second polymer.

### Claim 4 (depends on 1)

The method of claim 1, wherein the monomers comprise ethylene.

### Claim 5 (depends on 1)

The method of claim 1, comprising forming polyethylene.

### Claim 6 (depends on 1)

The method of claim 1, wherein the chromium catalyst is a reduced chromium oxide catalyst.