Ziegler-Natta catalysts for olefin polymerization

Patent metadata

Field	Value
Publication number	US-12359005-B2
Application number	US-202017764238-A
Country	US
Kind code	B2
Filing date	Oct 1, 2020
Priority date	Oct 4, 2019
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

The present invention relates to substituted 2-iso-propyl-1,3-dialkoxypropanes, and more particularly to their use as internal donors in Ziegler-Natta catalysts to obtain ethylene (co)polymers with desirable properties. The present disclosure further concerns use of Ziegler-Natta catalyst components comprising said substituted 2-iso-propyl-1,3-dimethoxypropanes and use of Ziegler-Natta catalysts in ethylene (co)polymerization comprising said Ziegler-Natta catalyst components.

First claim

The invention claimed is:

1. A Ziegler-Natta catalyst component comprising an internal donor selected from compounds of formula (I)

wherein
R 1 is nonyl; and
R 2 and R 3 are each independently C 1-3 -alkyl.

2. The Ziegler-Natta catalyst component according to claim 1 further comprising:
(ii) a compound of a transition metal Group 4 to 6 of the Periodic Table (IUPAC, Nomenclature of Inorganic Chemistry, 2005);
(iii) a compound of metal Group 1 to 3 of the Periodic Table (IUPAC, 2005); and
(iv) optionally, a compound of a element of Group 13 of the Periodic Table (IUPAC, 2005).

3. The Ziegler-Natta catalyst component according to claim 1 wherein the Ziegler-Natta catalyst component comprises:
(ii) a Group 4 to 6 metal content (determined by ICP Analysis) in a range of 1.0 wt % to 15.0 wt % of a total weight of the Ziegler-Natta catalyst component;
(iii) a Group 1 to 3 content (determined by ICP Analysis) in a range of 5.0 wt % to 30.0 wt % of the total weight of the Ziegler-Natta catalyst component;
(iv) a Group 13 element content (determined by ICP Analysis) in a range of 0 wt % to 3.0 wt % of the total weight of the Ziegler-Natta catalyst component.

4. A Ziegler-Natta catalyst component according to claim 1 , wherein the Ziegler-Natta catalyst component is prepared by a method comprising:
(M-a) providing a solid support;
(M-b) pre-treating the solid support of step (M-a) with a compound of Group 13 element, thereby generating a pre-treated solid support;
(M-c) treating the pre-treated solid support of step (M-b) with a transition metal compound of Group 4 to 6;
(M-d) recovering the Ziegler-Natta catalyst component;
wherein the solid support is contacted with one or more internal organic compounds of formula (I) before treating the solid support in step (M-c).

5. The Ziegler-Natta catalyst component according to claim 1 , wherein compound of formula (I) is selected from compounds of formula (I-a) and (I-b)

wherein
R 1 is nonyl.

6. A method for producing a Ziegler-Natta catalyst component according to claim 1 , comprising adding an internal donor selected from compounds of formula

wherein
R 1 is nonyl; and
R 2 and R 3 are each independently C 1-3 -alkyl,
to a constituent step of the method for preparing the Ziegler-Natta catalyst component.

7. A Ziegler-Natta catalyst for ethylene (co) polymerization, wherein the Ziegler-Natta catalyst comprises:
(A) the Ziegler-Natta catalyst component as defined in claim 1 ;
(B) a cocatalyst selected from element compounds of Group 13 of the Periodic Table (IUPAC, 2005); and
(C) optionally, an external donor.

8. A method of ethylene (co) polymerization optionally with C 3-20 comonomers, comprising:
a) introducing into a polymerization reactor a Ziegler-Natta catalyst component comprising an internal donor of formula (I)

wherein
R 1 is nonyl; and
R 2 and R 3 are each independently linear or branched C 1-3 -alkyl.

9. The method as claimed in claim 8 , wherein the internal donor of formula (I) is selected from compounds of formula (I-a) or (I-b)

wherein
R 1 is nonyl.

10. The method according to claim 8 , wherein the internal donor is comprised in a Ziegler-Natta catalyst component further comprises:
(ii) a transition metal compound of Group 4 to 6 of the Periodic Table (IUPAC, Nomenclature of Inorganic Chemistry, 2005);
(iii) a metal compound of Group 1 to 3 of the Periodic Table (IUPAC, 2005); and
(iv) optionally, a compound of group 13 of the Periodic Table (IUPAC, 2005).

11. A process for producing an ethylene homo- or copolymer, comprising:
(P-a) introducing a Ziegler-Natta catalyst component, comprising:
(i) an internal donor selected from compounds of formula (I), or from formulas (I-a) and (I-b)

wherein
R 1 is nonyl; and
R 2 and R 3 are each independently linear or branched C 1-3 -alkyl;
(ii) a transition metal compound of Group 4 to 6 of the Periodic Table (IUPAC, Nomenclature of Inorganic Chemistry, 2005);
(iii) a metal compound of Group 1 to 3 of the Periodic Table (IUPAC, 2005); and
(iv) optionally, a compound of group 13 of the Periodic Table (IUPAC, 2005)

into a polymerisation reactor,
(P-b) introducing a cocatalyst that activates the Ziegler-Natta catalyst component into the polymerisation reactor;
(P-c) introducing ethylene, optionally C 3 -C 20 α-olefin comonomers, and optionally hydrogen into the polymerisation reactor; and
(P-d) maintaining said polymerisation reactor in such conditions as to produce an ethylene homo- or copolymer.

12. The process according to claim 11 , wherein (co) polymerizing ethylene is accomplished in a multi-stage polymerization process comprising at least one gas phase reactor for producing ethylene (co) polymers.

13. The process according to claim 11 , wherein (co) polymerizing ethylene is accomplished in a multi-stage polymerization process comprising at least one slurry reactor, and one gas phase reactor.

Assignees

• Borealis Ag

Inventors

• Kipiani Georgy
• Mustonen Marja

Classifications

• C08F4/655

  with aluminium or compounds thereof · CPC title

• C08F4/651

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

• C08F2410/01

  Additive used together with the catalyst, excluding compounds containing Al or B · CPC title

• C08F210/16 Primary

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

• C08F10/02

  Ethene · CPC title