External donor for olefin polymerization

Patent metadata

Field	Value
Publication number	US-10689465-B2
Application number	US-201815915266-A
Country	US
Kind code	B2
Filing date	Mar 8, 2018
Priority date	Jun 15, 2017
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

The present invention provides an external electron donor composition comprising essentially of monoether as activity limiting agent for polymerization of olefins along with alkoxy silane as selectivity controlling agent, wherein mole percentage of the alkoxy silane to monoether is from 1 to 100.

First claim

The invention claimed is:

1. A process of polymerization of olefins, said process comprising the step of contacting an olefin having C2 to C20 carbon atoms under a polymerizing condition with a catalyst system comprising an external electron donor composition consisting essentially of a dibutyl ether as activity limiting agent in the range of 30 to 50 mole percent along with an alkoxy silane as selectivity controlling agent,
wherein the polymerization process is carried out at a temperature of around 70° C., and when the temperature during polymerization process elevates to 85° C. to 130° C., the dibutyl ether present in the external electron donor composition acts as an activity limiting agent and reduces the polymerization activity of the catalyst without affecting the polymer properties.

2. The polymerization process as claimed in claim 1 , wherein the catalyst system includes a catalyst, an organoaluminum compound and the external electron donor composition consisting essentially of a dibutyl ether as activity limiting agent in the range of 30 to 50 mole percent along with an alkoxy silane as selectivity controlling agent.

3. The polymerization process as claimed in claim 2 , wherein the catalyst comprises a magnesium moiety, a titanium compound, and an internal donor.

4. The polymerization process as claimed in claim 3 , wherein the magnesium moiety is in the form of magnesium dihalide which is magnesium dichloride having distorted crystal lattice as support or magnesium based precursor;
wherein the magnesium based precursor is liquid in nature and is prepared by contacting magnesium source with organohalide and alcohol in presence of the solvent in a single step; or the magnesium based precursor is solid in nature and is prepared by first contacting the magnesium source with organohalide in presence of solvating agent as the first step and then followed by addition of alcohol.

5. The polymerization process as claimed in claim 3 , wherein the titanium compound is represented by Ti(OR) p X 4-p , where Ti is titanium metal; X is a halogen atom; R is a hydrocarbon group and p is an integer having value equal or less than 4.

6. The polymerization process as claimed in claim 2 , wherein the organoaluminum compound is alkylaluminum selected from the group consisting of trialkylaluminum, trialkenylaluminum, dialkylaluminum halide, alkylaluminum sesquihalide, dialkylaluminum hydride, partially hydrogenated alkylaluminum, aluminoxane and mixtures thereof; wherein:
(a) trialkylaluminum is selected from the group consisting of triethylaluminum, triisopropylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, tri-n-octylaluminum;
(b) trialkenylaluminum is triisoprenyl aluminum;
(c) dialkylaluminum halide is selected from the group consisting of diethylaluminum chloride, dibutylaluminum chloride, diisobutylaluminum chloride and diethyl aluminum bromide;
(d) alkylaluminum sesquihalide is selected from the group consisting of ethylaluminum sesquichloride, butylaluminum sesquichloride and ethylaluminum sesquibromide;
(e) dialkylaluminum hydride is selected from the group consisting of diethylaluminum hydride and dibutylaluminum hydride;
(f) partially hydrogenated alkylaluminum is selected from the group consisting of ethylaluminum dihydride and propylaluminum dihydride and
(g) aluminoxane is selected from the group consisting of methylaluminoxane, isobutylaluminoxane, tetraethylaluminoxane and tetraisobutylaluminoxane; diethylaluminum ethoxide.

7. The polymerization process as claimed in claim 2 , wherein mole ratio of aluminum (from organoaluminum compound) to titanium metal (from catalyst) is from 5:1 to 500:1.

8. The polymerization process as claimed in claim 2 , wherein mole ratio of aluminum (from organoaluminum compound) to external donor composition is from 1:1 to 1:60.

9. The polymerization process as claimed in claim 2 , wherein mole ratio of alkoxysilane to titanium metal is from 1:1 to 1:30 and mole ratio of dibutyl ether to titanium metal is from 1:1 to 1:60.

10. The polymerization process as claimed in claim 1 , wherein the dibutyl ether as present in the external electron donor composition has the capability of acting as activity limiting agent at elevated polymerization temperature in the range of 85° C. to 130° C. and the dibutyl ether as present in the external electron donor composition also acts as excellent external donors during desirable/conventional polymerization temperature of 70° C., when the external electron donor composition comprises 50 mole percentage dibutyl ether along with alkoxysilanes.

11. The polymerization process as claimed in claim 7 , wherein mole ratio of aluminum (from organoaluminum compound) to titanium metal (from catalyst) is from 10:1 to 250:1.

12. The polymerization process as claimed in claim 7 , wherein mole ratio of aluminum (from organoaluminum compound) to titanium metal (from catalyst) is from 25:1 to 100:1.

13. The polymerization process as claimed in claim 8 , wherein mole ratio of aluminum (from organoaluminum compound) to external donor composition is from 1:1 to 1:40.

14. The polymerization process as claimed in claim 9 , wherein mole ratio of alkoxysilane to titanium metal is from 1:1 to 1:20 and mole ratio of dibutyl ether to titanium metal is from 1:1 to 1:40.

15. An external electron donor composition comprising essentially of dibutyl ether as activity limiting agent for polymerization of olefins along with alkoxy silane as selectivity controlling agent,
wherein mole percentage of the alkoxy silane to dibutyl ether is from 1 to 100.

16. The composition as claimed in claim 15 , wherein the alkoxy silane is selected from the group consisting of monoalkoxysilanes, dialkoxysilanes, trialkoxysilanes, tetraalkoxysilane, aminosilanes and mixtures thereof; wherein:
(a) the monoalkoxysilanes is selected from the group consisting of trimethylmethoxysilane, trimethylethoxysilane, trimethylphenoxysilane, tricyclopentylmethoxysilane, tricyclopentenylmethoxysilane, tricyclopentadienylmethoxysilane, tricyclopentylethoxysilane, cyclopentylmethylmethoxysilane, dicyclopentylethylmethoxysilane, dicyclopentylmethylethoxysilane, cyclopentyldimethylmethoxysilane, cyclopentyldiethylmethoxysilane, cyclopentyldimethylethoxysilane, bis(2,5-dimethylcyclopentyl)cyclopentylmethoxysilane, dicyclopentylcyclopentenylmethoxysilane, dicyclopentylcyclopentenadienylmethoxysilane, and diindenylcyclopentylmethoxysilane;
(b) the dialkoxysilane is selected from a group consisting of dimethyldimethoxysilane, dimethyldiethoxysilane diisopropyldimethoxysilane, diisobutyldimethoxysilane, t-butylmethyldimethoxysilane, t-butylmethyldiethoxysilane, t-amylmethyldiethoxysilane, dicyclopentyldimethoxysilane, diphenyldimethoxysilane, phenylmethyldimethoxysilane, diphenyldiethoxysilane, bis-o-tolydimethoxysilane, bis-m-tolydimethoxysilane, bis-p-tolydimethoxysilane, bis-p-tolydiethoxysilane, bisethylphenyldimethoxysilane, dicyclohexyldimethoxysilane, cyclohexylmethyldimethoxysilane, cyclohexylmethyldiethoxysilane, 2-norbornanemethyldimethoxysilane, dicyclopentyldimethoxysilane, bis(2-methylcyclopentyl)dimethoxysilane, bis(3-tertiary butylcyclopentyl)dimethoxysilane, bis(2,3-dimethylcyclopentyl)dimethoxysilane, bis(2,5-dimethylcyclopentyl)dimethoxysilane, dicyclopentyldiethoxysilane, dicyclobutyldiethoxysilane, cyclopropylcyclobutyldiethoxysilane, dicyclopentenyldimethoxysilane, di(3-cyclopentenyl)dimethoxysilane, bis(2,5-dimethyl-3-cyclopentenyl)dimethoxysilane, di-2,4-cyclopentadienyl)dimethoxysilane, bis(2,5-dimethyl-2,4-cyclopentadienyl)dimethoxysilane, bis(1-methyl-1-cyclopen

Assignees

• Indian Oil Corp Ltd

Inventors

• Kaur Sukhdeep
• Sahoo Usharani
• Singh Gurmeet
• Rani Rashmi
• Kapur Gurpreet Singh
• Shashikant

Classifications

• C08F10/00

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

• C08F4/6498

  containing another heteroatom · CPC title

• C08F4/6421 Primary

  Titanium tetrahalides with organo-aluminium compounds · CPC title

• C08F4/6494 Primary

  containing oxygen · CPC title

• C08F4/6465 Primary

  containing silicium · CPC title