Polymer flow index modifier

Patent metadata

Field	Value
Publication number	US-10870719-B2
Application number	US-201716094555-A
Country	US
Kind code	B2
Filing date	Apr 17, 2017
Priority date	Apr 20, 2016
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

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.

First claim

What is claimed:

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.

2. 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.

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

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

5. The method of claim 1 , comprising forming polyethylene.

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

Assignees

• Univation Tech Llc

Inventors

• Lester Charles D
• Goode Mark G
• Lynn Timothy R
• Cann Kevin J
• Moorhouse John H
• Matthews William Albert
• Sun Kefu
• Alexandre Francois

Classifications

• C08F110/02 Primary

  Ethene · CPC title

• C08F2410/06

  Catalyst characterized by its size · CPC title

• C08F4/24

  Oxides · CPC title

• C08K3/00

  Use of inorganic substances as compounding ingredients · CPC title

• C08F210/16 Primary

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title