# US 10,118,977 B2 · Ziegler-natta catalyst and preparation thereof

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- Number: US 10,118,977 B2
- Document ID: US10118977B2
- Status: Granted
- Kind: B2
- Application number: 15/536,919
- Filed: 2015-12-17
- Published: 2017-12-07
- Granted: 2018-11-06
- Earliest claimed: 2014-12-18
- Assignees: Borealis AG
- Applicants: Borealis AG
- Inventors: Victor Sumerin; Joseph Thorman
- Web page: https://patentgrep.com/patent/US10118977B2

## CPC

- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

This invention relates to a solid MgCl2 based Natta catalyst component for producing olefin polymers and preparation of said catalyst component. Further the invention relates to a Ziegler Natta catalyst comprising said solid catalyst component, Group 13 metal compound as cocatalyst and optionally external additives. The invention further relates to the use of said catalyst component in producing olefin polymers, especially ethylene polymers with desired properties.

## Claims

### Claim 1

A method for producing solid MgCl2 supported catalyst component comprising the steps
a) providing solid carrier particles of MgCl2*mROH adduct;
b) pre-treating the solid carrier particles of step a) with a compound of Group 13 metal;
c) treating the pre-treated solid carried particles of step b) with a transition metal compound of Group 4 to 6;
d) recovering the solid catalyst component;
wherein the solid carrier particles are contacted with an internal organic compound of formula (I) or isomers or mixtures therefrom before treating the solid carrier particles in step c)
wherein in the formula (I)
R1 to R5 are the same or different and are hydrogen, a linear or branched C1 to C8-alkyl group, or a C3-C8-alkylene group, or two or more of R1 to R5 can form a ring, the two oxygen-containing rings are individually saturated or partially unsaturated or unsaturated, and R in the adduct MgCl2*mROH is a linear or branched alkyl group with 1 to 12 C atoms, and m is 0 to 6; and
wherein the solid catalyst component has Mg/Ti mol/mol ratio of 1 to 10, Al/Ti mol/mol ratio of 0.01 to 1, and Cl/Ti mol/mol ratio of 5 to 20.

### Claim 2 (depends on 1)

A method according to claim 1, wherein the solid carrier particles are contacted with the internal organic compound of formula (I) or isomers or mixtures therefrom before the pre-treating step b).

### Claim 3 (depends on 1)

A method according to claim 1, wherein the solid carrier particles are contacted with the internal organic compound of formula (I) or isomers or mixtures therefrom simultaneously with the pre-treating step b) or after the pre-treating step b) but before the treating step c).

### Claim 4 (depends on 1)

A method according to claim 1 wherein in the formula (I) of the internal organic compound the two R1 are the same and are a linear C1 to C4-alkyl groups, or the two R1 form with the carbon atom they are attached to a ring with 3 to 7C-atoms, R2 to R5 are the same or different, or two or more of R2 to R5 residues can form a ring.

### Claim 5 (depends on 1)

A method according to claim 1 wherein in the formula (I) of the internal organic compound both R1 are the same and are methyl or ethyl groups and the residues R2 to R5 are the same or different and are H or a C1 to C2-alkyl groups.

### Claim 6 (depends on 1)

A method according to claim 1 wherein the internal organic compound is 2,2-di(2-tetrahydrofuryl) propane or 2,2-di-(2-furan)-propane.

### Claim 7 (depends on 1)

A method according to claim 1 wherein the R in MgCl2*mROH adduct is a linear or branched alkyl group containing 1 to 8 C atoms and m is 1 to 4.

### Claim 8 (depends on 1)

A method according to claim 1 wherein the Group 13 metal compound is an aluminum compound of the formula Al(alkyl)xX3-x (II), wherein each alkyl is independently a linear, branched or cyclic alkyl group of 1 to 12C-atoms, X is halogen and 1<x≤3.

### Claim 9 (depends on 1)

A method according to claim 1 wherein the Group 13 metal compound is selected from the group consisting of dialkyl aluminium chlorides, trialkyl aluminium, and mixtures therefrom.

### Claim 10 (depends on 1)

A method according to claim 1 wherein no Mg compounds are used in catalyst preparation other than the MgCl2*mROH adduct.

### Claim 11 (depends on 1)

A solid MgCl2 supported catalyst component prepared by the method of claim 1.

### Claim 12 (depends on 11)

A catalyst comprising the solid MgCl2 supported catalyst component of claim 11 and a cocatalyst of Group 13 metal compound.

### Claim 13 (depends on 11)

A process of producing an ethylene polymer comprising polymerising ethylene in the presence of the solid MgCl2 supported catalyst component of claim 11.

### Claim 14 (depends on 12)

A process for producing ethylene polymer in a polymerisation process comprising polymerisation of ethylene in the presence of the Ziegler-Natta catalyst of claim 12 under polymerisation conditions in at least one polymerisation stage carried out in a solution, slurry or gas phase reactor or combinations thereof.

### Claim 15 (depends on 4)

A method according to claim 4 wherein in the formula (I) of the internal organic compound, the two R1 form with the carbon atom they are attached to a cyclopentyl or cyclohexyl ring.

### Claim 16 (depends on 4)

A method according to claim 4 wherein in the formula (I) of the internal organic compound, R3 and R4 residues form a ring and/or R4 and R5 residues form a ring.

### Claim 17 (depends on 5)

A method according to claim 5 wherein in the formula (I) of the internal organic compound at most two of the residues R2 to R5 are a methyl, the others are H.

### Claim 18 (depends on 6)

A method according to claim 6 wherein the internal organic compound is 2,2-di(2-tetrahydrofuryl) propane.

### Claim 19 (depends on 13)

A process according to claim 13 further comprising polymerising ethylene with comonomers.

### Claim 20 (depends on 14)

A method according to claim 14 further comprising polymerisation of ethylene with comonomers selected from C3-C20-alpha-olefins.