Process for the preparation of a catalyst component and components therefrom obtained

Patent metadata

Field	Value
Publication number	US-12509533-B2
Application number	US-202017777365-A
Country	US
Kind code	B2
Filing date	Nov 5, 2020
Priority date	Nov 20, 2019
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

A process for preparing a catalyst component made from or containing Mg, Ti, and at least an electron donor compound (ID), including the steps of: (a) reacting a Mg based compound with a Ti compound, having at least a Ti—Cl bond, in an amount such that the Ti/Mg molar ratio is greater than 3 and at a temperature ranging from 0 to 150° C., thereby yielding an intermediate solid catalyst component containing Mg and Ti; and (b) contacting the intermediate solid catalyst component with a gaseous stream containing the electron donor compound (ID) in a gaseous dispersing medium, thereby yielding a final solid catalyst component having an ID/Ti molar ratio ranging from 0.5:1 to 20:1.

First claim

What is claimed is:

1 . A process for preparing a catalyst component comprising Mg, Ti, and at least an electron donor compound (ID) comprising the steps of:
(a) reacting a Mg based compound with a Ti compound, having at least a Ti—Cl bond, in an amount such that the Ti/Mg molar ratio is greater than 3 and at a temperature ranging from 0 to 150° C., thereby yielding an intermediate solid catalyst component containing Mg and Ti; and (b) contacting the intermediate solid catalyst component with a gaseous stream containing the electron donor compound (ID) in a gaseous dispersing medium, thereby yielding a final solid catalyst component having an ID/Ti molar ratio ranging from 0.5:1 to 20:1.

2 . The process according to claim 1 , wherein the electron donor compound (ID) is a molecule containing at least one functional group selected from the group consisting of esters, ketones, amines, amides, carbamates, carbonates, aliphatic ethers, nitriles, alkoxysilanes, and glycols.

3 . The process according to claim 2 , wherein the ID compound is selected from the group consisting of C 2 -C 20 aliphatic ethers and alkyl esters of C 1 -C 20 aliphatic carboxylic acids.

4 . The process according to claim 2 , wherein the ID compound is monofunctional.

5 . The process according to claim 2 , wherein the electron donor compound (ID) is a molecule containing at least one functional group selected from the group consisting of tetrahydrofuran, methylformiate, ethylacetate ethylformiate, methylacetate, propylacetate, i-propylacetate, n-butylacetate, i-butylacetate, methyltrimethoxysilane, dimethyldimethoxysilane, and trimethylmethoxysilane.

6 . The process according to claim 2 , wherein two or more IDs are used.

7 . The process according to claim 6 , wherein a first ID is selected from aliphatic ethers and a second ID is selected from aliphatic acid esters.

8 . The process according to claim 1 , wherein the Mg compound is a Lewis adduct of formula MgCl 2 (ROH) m adducts, wherein R groups are C 1 -C 20 hydrocarbon groups and m is from 0.1 to 6.

9 . The process according to claim 1 , wherein the intermediate solid catalyst component is pre-polymerized before being subjected to step (b).

10 . The process according to claim 1 , wherein, in step (b), the amount of ID compound fixed on the catalyst component is such that ID/Ti molar ranges from 1.0:1 to 15:1.

11 . The process according to claim 1 , wherein the gaseous stream comprises an inert gas carrying the ID compound in gaseous or liquid form.

12 . The process according to claim 11 , wherein the ID compound is in gaseous form.

13 . The process according to claim 11 , wherein the inert gas is nitrogen.

14 . The process according to claim 11 , wherein step (b) is carried out in a gas-phase reactor, wherein the gaseous stream comprises a fluidizing gas and wherein the fluidizing gas is an inert gas.

15 . The process according to claim 1 , wherein the contact temperature in step (b) is in the range from 10 to 120° C.

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Brita Diego
• Collina Gianni
• Evangelisti Daniele
• Gaddi Benedetta
• Gessi Piero
• Morini Giampiero
• Soffritti Silvia
• Vincenzi Paolo

Classifications

• C08F2410/01

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

• C08F2/01

  characterised by special features of the polymerisation apparatus used · CPC title

• C08F2/34

  Polymerisation in gaseous state · CPC title

• C08F4/6545

  and metals of C08F4/64 or compounds thereof · CPC title

• C08F4/651

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