# US 4,397,762 A · Polymerization catalyst

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- Number: US 4,397,762 A
- Document ID: US4397762A
- Status: Granted
- Kind: A
- Application number: 06/343,249
- Filed: 1982-01-27
- Granted: 1983-08-09
- Earliest claimed: 1982-01-27
- Assignees: BP Chemicals Limited
- Inventors: Alexander Johnstone
- Web page: https://patentgrep.com/patent/US4397762A

## CPC

- C08F 10/00: Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A supported Ziegler catalyst prepared by the following steps, carried out under anhydrous conditions: (A) reacting a hydroxyl groups-containing support material comprising magnesium silicate or silica and magnesia with one or more organo-metallic compounds having the general formula MR.sup.1.sub.a Q.sub.b-a wherein M is a metal which is aluminium, boron, lithium, zinc or magnesium, R.sup.1 is a hydrocarbyl group, Q is halogen or an oxyhydrocarbyl group, b is the valency of M and a is an integer from 1 to b, (B) removing unreacted organometallic compound, if any, from the produced solid material, (C) impregnating the solid material obtained from step B with one or more halogen-containing transition metal compounds wherein the transition metal(s) comprise titanium, vanadium or zirconium.

## Claims

### Claim 1

A supported Ziegler catalyst prepared by the following steps, carried out under anhydrous conditions:
(A) reacting a hydroxyl groups-containing support material comprising magnesium silicate or silica and magnesia with one or more organometallic compounds having the general formula MR.sup.1.sub.a Q.sub.b-a wherein M is a metal which is aluminium, boron, lithium, zinc or magnesium, R.sup.1 is a hydrocarbyl group, Q is halogen or an oxyhydrocarbyl group, b is the valency of M and a is an integer from 1 to b,
(B) removing unreacted organometallic compound, if any, from the produced solid material,
(C) impregnating the solid material obtained from step B with one or more halogen-containing transition metal compounds wherein the transition metal (s) comprise titanium, vanadium or zirconium.

### Claim 2 (depends on 1)

A catalyst as claimed in claim 1 wherein the hydroxyl groups-containing support material is a coprecipitated silica-magnesia.

### Claim 3 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein the atomic ratio of silicon:magnesium in the support material is in the range 20:1 to 1:20.

### Claim 4 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein the organometallic compound employed in step A is a trihydrocarbyl aluminium, a trihydrocarbyl boron, a dihydrocarbyl zinc, a dihydrocarbyl magnesium or a hydrocarbyl lithium compound.

### Claim 5 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein the organometallic compound employed in step A is triethylaluminium.

### Claim 6 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein the quantity of organometallic compound employed in step A is in the range 0.5 to 1.5 moles per mole of surface hydroxyl groups on the support material.

### Claim 7 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein, in step B, unreacted organometallic compound is removed from the solid material produced in step A by washing the solid material with an anhydrous inert solvent.

### Claim 8 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein the one or more halogen-containing transition metal compounds employed in step C are selected from compounds having the general formulae DX.sub.m, DOX.sub.(m-2) and D(OR.sup.2).sub.n X.sub.m-n wherein D is the titanium, vanadium or zirconium: X is halogen, O is oxygen, R.sup.2 is a hydrocarbyl group containing 1 to 10 carbon atoms: m is the valency of D: and n is an integer from 1 to m-1.

### Claim 9 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein the transition metal compound is titanium tetrachloride or vanadyl chloride.

### Claim 10 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein the quantity of transition metal compound employed in step C is in the range 0.25 to 1.5 moles per mole of organometallic compound residue bound to the support surface.

### Claim 11 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein the one or more halogen-containing transition metal compounds employed in step C comprises a mixture of titanium and vanadium compounds.

### Claim 12 (depends on 11)

A catalyst as claimed in claim 11 wherein the titanium compound is titanium tetrachloride and the vanadium compound is vanadyl chloride (VOCl.sub.3).

### Claim 13 (depends on 1, 2)

A catalyst as claimed in claim 1 or claim 2 wherein the catalyst product obtained from step C is washed with dry inert solvent to remove any unadsorbed transition metal compound.