Methods of catalyst activation

Patent metadata

Field	Value
Publication number	US-10246535-B2
Application number	US-201614990899-A
Country	US
Kind code	B2
Filing date	Jan 8, 2016
Priority date	Nov 17, 2008
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A method comprising preparing a multi-component catalyst system comprising a catalyst and a cocatalyst, and adjusting the level of at least one component of the catalyst system to maintain a user-desired level of catalyst activity throughout a process, wherein the component comprises a catalyst activator and wherein the catalyst activator comprises the catalyst or the cocatalyst. A method comprising contacting a polymerization catalyst system comprising a Ziegler-Natta catalyst and a cocatalyst with a catalyst activator at least twice during a polymerization process, wherein the polymerization process is carried out in a reactor system comprising multiple reactor types.

First claim

What is claimed is:

1. A method comprising:
preparing a multi-component catalyst system comprising a catalyst and a cocatalyst; and
adjusting a level of at least one component of the multi-component catalyst system to maintain a user-desired level of catalyst activity throughout a polymerization process;
wherein the at least one component comprises a catalyst activator, and wherein the catalyst activator comprises the catalyst.

2. The method of claim 1 , wherein the catalyst activator functions to maintain the catalyst activity to a user-desired threshold level throughout the polymerization process.

3. The method of claim 1 , wherein the multi-component catalyst system comprises an external electron donor.

4. The method of claim 1 , wherein the multi-component catalyst comprises a Ziegler-Natta catalyst, a metallocene catalyst, or combinations thereof.

5. The method of claim 1 , wherein the cocatalyst comprises an organoaluminum compound.

6. The method of claim 5 , wherein the organoaluminum compound comprises tri ethyl aluminum, tri-isobutylaluminum, diethylaluminum chloride, diethylaluminum hydride, methylalumoxane, tri-isobutylaluminum, or combinations thereof.

7. The method of claim 3 , wherein the electron donor comprises an external electron donor.

8. The method of claim 7 , wherein the external electron donor comprises cyclohexylmethyl dimethoxysilane, dicyclopentyl dimethoxysilane, diisopropyl dimethoxysilane, or combinations thereof.

9. The method of claim 1 , wherein multi-component catalyst system functions as a polymerization catalyst.

10. The method of claim 1 , wherein the multi-component catalyst system is introduced to a first location in a reaction zone and the catalyst activator is introduced to a second location in the reaction zone.

11. The method of claim 10 , wherein the reaction zone comprises multiple reactor types.

12. The method of claim 1 , wherein the polymerization process is a polymerization process for the production of a polypropylene impact copolymer.

Assignees

• Fina Technology

Inventors

• Blackmon Kenneth P
• Ribour David
• Malbari Shabbir
• Coffy Tim
• Daumerie Michel

Classifications

• C08F210/06 Primary

  Propene · CPC title

• C08F10/00

  Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond · CPC title

• C08F4/6465

  containing silicium · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08F210/16

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