Polymerization process for the production of high density polyethylene

Patent metadata

Field	Value
Publication number	US-9988467-B2
Application number	US-201414780236-A
Country	US
Kind code	B2
Filing date	Mar 27, 2014
Priority date	Mar 28, 2013
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

The invention relates to a polymerization process for the production of high density polyethylene by polymerization of ethylene in the presence of a catalyst composition comprising a chromium compound, a support material wherein the alcohol is a primary alcohol having the formula (I) wherein R, R′ and R″ are the same or different and respectively represent a linear or branched alkyl, cycloalkyl, phenyl or phenyl containing radicals comprising from 5 to 15 carbon atoms and wherein only one of R, R′ or R″ can be a hydrogen radical and/or wherein the alcohol is a secondary alcohol and/or a secondary cyclic alcohol. The catalyst composition may also comprise a titanium compound. The high density polyethylene may be applied in the production of blow molded articles.

First claim

The invention claimed is:

1. A polymerization process for the production of high density polyethylene by polymerization of ethylene in the presence of a catalyst composition comprising a chromium compound, an alcohol, and a support material, wherein the alcohol is a primary alcohol and/or a secondary alcohol, characterised in that the primary alcohol has the formula:

wherein R, R′, and R″ are the same or different and each respectively represents a linear or branched alkyl, cycloalkyl, phenyl, or phenyl containing radicals comprising from 5 to 30 carbon atoms, and with the proviso that only one of R, R′, or R″ is a hydrogen radical.

2. A process according to claim 1 characterised in that the catalyst composition additionally comprises a titanium compound.

3. A process according to claim 1 , characterised in that the alcohol is the secondary alcohol having the formula:

wherein R and R′ are the same or different and respectively each represents a linear or branched alkyl, cycloalkyl, phenyl, or phenyl containing radicals comprising from 5 to 30 carbon atoms.

4. A process according to claim 3 characterised in that the secondary alcohol is selected from 4-methyl-2-pentanol, 3-pentanol, 1,1-diphenylmethanol, and 1,1-diphenylethanol.

5. A process according to claim 1 characterised in that the alcohol is the secondary alcohol that is a secondary cyclic alcohols having the formula:

wherein n is from 1 to 13, and the cyclic ring represents a cycloalkane comprising from 3 to 5 carbon atoms, optionally substituted with a linear or branched alkyl radical, one or more phenyl rings, or one or more phenyl containing radicals comprising from 1 to 15 carbon atoms.

6. A process according to claim 5 characterised in that the secondary cyclic alcohol is selected from cyclohexanol, cyclopentanol, cycloheptanol and fluorenol.

7. A process according to claim 1 characterised in that the primary alcohol is selected from cyclohexanemethanol, 2-ethylhexanol and 2,2-dimethylpropanol.

8. A process according to claim 1 characterised in that the support material is silica support material.

9. A process according to claim 1 characterised in that the chromium compound is selected from chromium acetate, chromium acetyl acetonate, chromium acetate hydroxide and chromium trioxide.

10. A process according to claim 2 characterised in that the titanium compound is a titanium alkoxide.

11. A process according to claim 5 characterised in that the catalyst composition additionally comprises a titanium compound.

12. A process according to claim 5 characterised in that the support material is silica support material.

13. A process according to claim 5 characterised in that the chromium compound is selected from chromium acetate, chromium acetyl acetonate, chromium acetate hydroxide and chromium trioxide.

14. A process according to claim 11 characterised in that the titanium compound is a titanium alkoxide.

15. A polymerization process for the production of high density polyethylene by polymerization of ethylene in the presence of a catalyst composition, the process comprising:
combining a chromium compound and a support material to provide a supported catalyst;
contacting an alcohol with the supported catalyst to form a catalyst composition; and
polymerizing ethylene using the catalyst composition,
wherein the alcohol is a primary alcohol and/or a secondary alcohol.

16. A process according to claim 15 , characterised in that the catalyst composition additionally comprises a titanium compound.

Assignees

• Saudi Basic Ind Corp

Inventors

• Aliyev Vugar
• Blackmore Ian

Classifications

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08J5/00

  Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) · CPC title

• C08J2323/06

  Polyethene · CPC title

• C08F2500/07

  High density, i.e. > 0.95 g/cm3 · CPC title

• C08F4/24

  Oxides · CPC title