# US 5,703,182 A · Process for the production of polyisoolefins by means of novel metallocene type initiator systems

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- Number: US 5,703,182 A
- Document ID: US5703182A
- Status: Granted
- Kind: A
- Application number: 08/789,466
- Filed: 1997-01-27
- Granted: 1997-12-30
- Earliest claimed: 1996-01-31
- Assignees: Bayer Aktiengesellschaft
- Inventors: Gerhard Langstein; Manfred Bochmann; David M. Dawson
- Web page: https://patentgrep.com/patent/US5703182A

## CPC

- C07F 17/00: Metallocenes
- C08F 10/10: Isobutene
- C08F 110/10: Isobutene
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Polyisoolefins are produced using the process according to the invention by polymerising isoolefins, optionally with conjugated or unconjugated dienes and/or cationically polymerisable, mono- or polyunsaturated compounds in solution, in suspension or in the gas phase at temperatures of -100.degree. C. to +200.degree. C. and pressures of 0.1 to 100 bar in the presence of an initiator system consisting of aluminium-cyclopentadienyl compounds and boron compounds.

## Claims

### Claim 1

Process for the production of polyisoolefins, comprising the step of polymerizing isoolefins of the formula CH.sub.2 .dbd.CR.sup.1 R.sup.2, where R.sup.1 means methyl and R.sup.2 means C.sub.1 -C.sub.10 alkyl or C.sub.3 -C.sub.10 cycloalkyl, optionally together with conjugated or unconjugated dienes having 4 to 20 carbon atoms and/or cationically polymerisable, mono- or polyunsaturated compounds having 4 to 20 carbon atoms, in solution, in suspension or in the gas phase at temperatures of -100.degree. C. to +200.degree. C. and pressures of 0.1 to 100 bar in the presence of initiator systems consisting of the following components:
A) Cp'.sub.2 AlR.sup.3 and
B) BR.sup.4 R.sup.5 R.sup.6,
in which
Cp' is an optionally substituted cyclopentadienyl residue,
R.sup.3 denotes C.sub.1 -C.sub.10 alkyl or C.sub.3 -C.sub.10 cycloalkyl and
R.sup.4, R.sup.5 and R.sup.6 have the meaning of R.sup.3 or represent C.sub.6 -C.sub.18 aryl groups which may be mono- or polysubstituted by halogen.

### Claim 2

Novel initiator systems for the polymerisation of isoolefins consisting of:
A) Cp'.sub.2 AlR.sup.3 and
B) BR.sup.4 R.sup.5 R.sup.6,
in which
Cp' is an optionally substituted cyclopentadienyl residue,
R.sup.3 denotes C.sub.1 -C.sub.10 alkyl or C.sub.3 -C.sub.10 cycloalkyl and
R.sup.4, R.sup.5 and R.sup.6 have the meaning of R.sup.3 or represent C.sub.6 -C.sub.18 aryl groups, which may be mono- or polysubstituted by halogen.

### Claim 3 (depends on 1)

The process of claim 1 wherein R.sup.2 .dbd.C.sub.1 -C.sub.6 alkyl, and the conjugated or unconjugated dienes have 4 to 10 carbon atoms.

### Claim 4 (depends on 1)

The process of claim 1 wherein the conjugated or unconjugated dienes and/or the mono- or polyunsaturated, organic compounds are incorporated by polymerization in quantities of 0.01 to 20 mol %.

### Claim 5 (depends on 1)

The process of claim 1 wherein the polymerization is conducted continuously, discontinuously, in a single stage or multiple stages.

### Claim 6 (depends on 1)

The process of claim 1 wherein the polymerization is conducted at temperatures of -100.degree. C. to 100.degree. C. and pressures of 1 to 50 bar.

### Claim 7 (depends on 1)

The process of claim 1 wherein initiator component A) is used at a concentration of 10.sup.-3 to 10.sup.-7 mol/l of reactor volume.

### Claim 8 (depends on 1)

The process of claim 1 wherein initiator component B) is used in a molar ratio relative to component A) of 1:100 to 10.sup.4 :1.

### Claim 9 (depends on 1)

The process of claim 1 wherein initiator component A) is used at a concentration of 10.sup.-4 to 10.sup.-6 mol/l of reactor volume, and initiator B) is used in a molar ratio relative to component A) of 1:10 to 10.sup.2 :1.