# US 5,710,225 A · Heteropolyacid catalyzed polymerization of olefins

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- Number: US 5,710,225 A
- Document ID: US5710225A
- Status: Granted
- Kind: A
- Application number: 08/701,937
- Filed: 1996-08-23
- Granted: 1998-01-20
- Earliest claimed: 1996-08-23
- Assignees: The Lubrizol Corporation
- Inventors: John R. Johnson; James D. Burrington
- Web page: https://patentgrep.com/patent/US5710225A

## 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

Phosphotungstic acid salts are used to polymerize C.sub.2 -C.sub.30 .alpha.-olefins and derivatives thereof to form highly reactive products having a high content of terminal vinylidene groups and .beta.-isomers in resonance therewith. Isobutylene has been polymerized to form a Mn 300-20,000 polymer.

## Claims

### Claim 1

A method for producing polymers by polymerization of olefins, the method comprising:
contacting a C.sub.2 -C.sub.30 olefin of formula R'--C(R").uparw.CH.sub.2 where R' is H or hydrocarbyl and R"is H or methyl with a partially or fully neutralized heteropolyacid to produce said polymer, said polymer having a degree of polymerization (dp) of at least 6.

### Claim 2 (depends on 1)

The method according to claim 1, wherein said partially or fully neutralized heteropolyacid is a phosphotungstic acid, silicotungstic acid, phosphomolydic acid or silicomolybdic acid.

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

The method according to claims 1 or 2, wherein said partially or fully neutralized heteropoly acid contains cations from groups 1A; 2A; and 3A of the periodic chart.

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

The method according to claim 1 or 2, wherein said partially or fully neutralized heteropolyacid contains cations Cs.sup.+, Mg.sup.2+, NH.sub.4.sup.+ or Zn.sup.+2 or mixtures thereof.

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

The method according to claim 1 or 2, wherein the combined terminal vinylidene (I) and .beta.-isomer (II) content of said polymer is at least 30%.

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

The method according to claim 1 or 2, wherein the combined terminal vinylidene (I) and .beta.-isomer (II) content of said polymer is at least 60%.

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

The method according to claim 1 or 2, wherein said olefin is isobutylene and said polymer is Mn 300-20,000 polyisobutylene.

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

The method according to claim 1 or 2, wherein said partially or fully neutralized heteropoly add is calcined prior to contacting said olefin.

### Claim 9 (depends on 2)

A method according to claim 2, wherein said phosphotungstic acid is Cs.sub.2.5 H.sub.0.5 PW.sub.12 O.sub.40.

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

The method according to claim 1 or 2, wherein said partially or fully neutralized heteropolyaeid is a supported heteropolyacid.