Process for production of high melt flow propylene-based polymer and product from same

Patent metadata

Field	Value
Publication number	US-11254756-B2
Application number	US-201916445865-A
Country	US
Kind code	B2
Filing date	Jun 19, 2019
Priority date	Dec 21, 2010
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.

First claim

The invention claimed is:

1. A procatalyst composition comprising:
a magnesium moiety, a titanium moiety, and a substituted-1,2-phenylene dibenzoate having structure (I),

wherein R 1 -R 14 are the same or different, each of R1 and R4 is a methyl group, at least one of R2 or R3 is hydrogen and at least one is a cyclohexyl group, and each of R5-R14 is selected from hydrogen, a halogen, a hydrocarbyl group having 1 to 20 carbon atoms, or a hydrocarbyloxy group having 1 to 20 carbon atoms.

2. A procatalyst composition as defined in claim 1 , wherein the magnesium moiety comprises a magnesium halide.

3. A catalyst composition comprising the procatalyst composition as defined in claim 1 , and a cocatalyst.

4. A catalyst composition as defined in claim 3 , wherein the cocatalyst comprises an alkyl aluminum compound.

5. A catalyst composition comprising the procatalyst composition as defined in claim 1 , a cocatalyst and an external electron donor.

6. A catalyst composition as defined in claim 5 , wherein the external electron donor comprises an alkoxysilane.

7. A catalyst composition as defined in claim 5 , wherein the external electron donor comprises dicyclopentyldimethoxysilane, di-tert-butyldimethoxysilane, methylcyclohexyldimethoxysilane, methylcyclohexyldiethoxysilane, ethylcyclohexyldimethoxysilane, diphenyldimethoxysilane, diisopropyldimethoxysilane, di-n-propyldimethoxysilane, n-propyltrimethoxysilane, diisobutyldimethoxysilane, diisobutyldiethoxysilane, isobutylisopropyldimethoxysilane, di-n-butyldimethoxysilane, cyclopentyltrimethoxysilane, isopropyltrimethoxysilane, n-propyltriethoxysilane, ethyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, diethylaminotriethoxysilane, cyclopentylpyrrolidinodimethoxysilane, bis(pyrrolidino)dimethoxysilane, bis(perhydroisoquinolino)dimethoxysilane, and dimethyldimethoxysilane.

8. A catalyst composition as defined in claim 3 , further containing an activity limiting agent.

9. A procatalyst composition as defined in claim 1 , wherein the magnesium moiety comprises magnesium chloride.

10. A catalyst composition as defined in claim 5 , wherein the cocatalyst comprises an alkyl aluminum compound.

11. A catalyst composition as defined in claim 5 , further comprising an activity limiting agent.

12. A process for producing an olefin-based polymer comprising:
contacting under polymerization conditions an olefin and optionally one or more comonomers with a procatalyst composition as defined in claim 1 , and a cocatalyst, an external electron donor, and optionally an activity limiting agent.

Assignees

• W R Grace & Co —Conn
• Grace W R & Co

Inventors

• Chen Linfeng
• Leung Tak W
• Tao Tao
• Gao Kuanqiang

Classifications

• C08F4/16

  of silicon, germanium, tin, lead, titanium, zirconium or hafnium · CPC title

• C08F4/651

  Pretreating with non-metals or metal-free compounds · CPC title

• C08F4/646

  Catalysts comprising at least two different metals, in metallic form or as compounds thereof, in addition to the component covered by group C08F4/64 {(C08F4/64003 - C08F4/64196 take precedence)} · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08F4/00 Primary

  Polymerisation catalysts · CPC title