Catalyst components for the polymerization of olefins

Patent metadata

Field	Value
Publication number	US-10759882-B2
Application number	US-201716337779-A
Country	US
Kind code	B2
Filing date	Sep 25, 2017
Priority date	Sep 30, 2016
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A process for the preparation of a solid catalyst component for the homo or copolymerization of olefins, wherein the solid catalyst component is made from or contains Mg, Ti, halogen and an electron donor selected from cycloalkyl ethers, wherein the process includes the steps of (a) dissolving a Mg based compound and a TiCl 3 based compound in a liquid medium further made from or containing a cycloalkyl ether and a compound of formula R 2 OH where R 2 is a C 1 -C 20 hydrocarbon group, in which the Ti/Mg molar ratio ranges from 0.1 to 0.5, the cycloalkyl ether/Mg ratio ranges from 1 to 4 and the ROH/Mg molar ratio ranges from 1 to 4; and (b) adding, to the solution coming from step (a), SiCl 4 in an amount such that the R 2 OH/SiCl 4 molar ratio ranges from 0.5 to 1.5 and maintaining the temperature in the range 50-150° C. thereby precipitating the solid catalyst component particles.

First claim

What is claimed is:

1. A process for the preparation of a solid catalyst component for the homo or copolymerization of olefins CH 2 ═CHR, wherein R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, wherein the solid catalyst component comprises Mg, Ti, halogen and an electron donor selected from cycloalkyl ethers, comprising the steps of:
(a) dissolving, at a temperature,
a composition comprising
a Mg based compound of formula (MgCl m X 2-m ), wherein
m ranges from 0 to 2,
X is, independently R1, OR1, —OCOR1 or O—C(O)—OR1 group, wherein R1 is a C 1 -C 20 hydrocarbon group, and
a TiCl 3 based compound
in a liquid inert medium further comprising
a cycloalkyl ether and
a compound of formula R 2 OH, wherein
R 2 is a C 1 -C 20 hydrocarbon group,
wherein
the Ti/Mg molar ratio ranges from 0.1 to 0.5,
the cycloalkyl ether/Mg ratio ranges from 1 to 4 and
the R 2 OH/Mg molar ratio ranges from 1 to 4,
thereby yielding a solution; and

(b) adding, to the solution coming from step (a), SiCl 4 in an amount such that the R 2 OH/SiCl 4 molar ratio ranges from 0.5 to 1.5 and maintaining the temperature in the range 50-150° C., thereby precipitating the solid catalyst component in the form of particles.

2. The process of claim 1 , wherein the Mg based compound of step (a) is MgCl 2 .

3. The process of claim 1 , wherein the liquid inert medium is selected from aromatic hydrocarbons.

4. The process of claim 1 , wherein the cycloalkyl ether has 3-5 carbon atoms.

5. The process of claim 1 , wherein R 2 is a C 3 -C 15 alkyl group.

6. The process of claim 1 , wherein the cycloalkyl ether/Mg molar ratio ranges from 1.5 to 3.0 and the Ti/Mg molar ratio ranges from 0.15 to 0.35.

7. The process of claim 1 , wherein the step (a) composition further comprises an additional compound of an element of the Lanthanides series or a transition metal belonging to groups 3-12 of the Periodic Table, excluding Ti.

8. The process of claim 7 , wherein the additional compound is selected from halides, alcoholates and carboxylates of the elements and metals.

9. The process of claim 7 , wherein the additional compound is selected from the group consisting of chlorides of Cu, Zn, Pr, and Nb.

10. The process of claim 7 , wherein the additional compound is added to the mixture of step (a) in amount such that its molar ratio with Mg ranges from 0.01 to 0.40.

11. The process of claim 1 , wherein in step (a), the temperature is maintained in the range 50-120° C.

12. The process of claim 1 , wherein in step (b), SiCl 4 is added in an amount such that the R 2 OH/SiCl 4 molar ratio ranges from 0.6 to 1.3.

13. The process of claim 1 , wherein the temperature of step (b) is maintained in the range 60-130° C.

14. A process for the homo or copolymerization of ethylene in which ethylene is polymerized in the presence of a catalyst comprising (1) a solid catalyst component prepared according to claim 1 and (2) an aluminum alkyl compound.

15. The process of claim 14 , wherein the catalyst further comprises an external electron donor compound selected from silicon compounds, ethers, esters, amines, heterocyclic compounds, and ketones.

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Guidotti Simona
• DALL'OCCO Tiziano
• Liguori Dario
• Morini Giampiero

Classifications

• C08F210/16 Primary

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

• C08F2410/01

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

• C08F10/02 Primary

  Ethene · CPC title

• C08F4/6567

  and aluminium or compounds thereof · CPC title

• C08F4/651

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