# US 5,344,804 A · Polymerization of cycloolefins and catalytic system suitable for use therein

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- Number: US 5,344,804 A
- Document ID: US5344804A
- Status: Granted
- Kind: A
- Application number: 07/915,600
- Filed: 1992-07-21
- Granted: 1994-09-06
- Earliest claimed: 1991-08-16
- Assignees: Shell Research Limited
- Inventors: Willem Sjardijn; Josepha M. E. Seelen-Kruijssen
- Web page: https://patentgrep.com/patent/US5344804A

## CPC

- C08G 61/08: of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A catalyst system for the polymerization of cyclic olefins, comprising (1) a tungsten compound which is obtainable by combining a tungsten halide and/or a tungsten oxyhalide with a phenol compound which is substituted with a bulky alkyl group at the positions ortho with respect to the hydroxyl group; (2) one or more compounds of the general formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 each represent an optionally substituted alkoxy group in the range of from 2 to 8 carbon atoms and preferably from 2 to 4 carbon atoms, and wherein at most one of the symbols R.sup.1, R.sup.2 and R.sup.3 may represent hydrogen or halogen and preferably chlorine, the compound of formula I being substantially free of organo-tin compounds; (3) a boron halide, and a process for in mould polymerization using such catalysts.

## Claims

### Claim 1

A catalyst system for the polymerization of cyclic olefins, comprising:
(1) a tungsten compound obtained by combining a tungsten halide and/or a tungsten oxyhalide with a phenol compound substituted with an alkyl group at the positions ortho with respect to the hydroxyl group;
(2) one or more silane compounds having the formula ##STR6## wherein R.sup.1, R.sup.2 and R.sup.3 represent hydrogen, halogen or an alkoxy group having from 2 to 8 carbon atoms, and wherein at most one of R.sup.1, R.sup.2 and R.sup.3 represent hydrogen or halogen, the compound of formula I being substantially free of organo-tin compounds; and
(3) a boron halide, selected from the group consisting of boron tribromide, boron trifluoride etherate, boron trifluoride ethylamine and boron trifluoride butyrate.

### Claim 2 (depends on 1)

A catalyst system according to claim 1, wherein the component (2) is triethoxysilane.

### Claim 3 (depends on 1)

A catalyst system according to claim 1, wherein in component (1) said tungsten compound is selected from the group consisting of WCl.sub.6 and WOCl.sub.4.

### Claim 4 (depends on 3)

A catalyst system according to claim 3, wherein the tungsten compound is WOCl.sub.4.

### Claim 5 (depends on 1)

A catalyst system according to claim 1, wherein in component (1) said substituted phenol compound is selected from the group consisting of 2,6-diisopropylphenol, 2,6-diisobutylphenol, and 2,6-di-tert-butylphenol, 2,6-diisobutyl-4-methylphenol and 2,6-di-tert-butyl-4-methylphenol.

### Claim 6 (depends on 1)

A catalyst system according to claim 1, wherein the molar ratio of said component (2) to said component (1) is from 4:1 to 10:1.

### Claim 7 (depends on 6)

A catalyst system according to claim 6, wherein said molar ratio is from 6:1 to 8:1.

### Claim 8 (depends on 1)

A catalyst system according to claim 1, wherein the molar ratio of said component (3) to said component (1) is from 2:1 to 8:1.

### Claim 9 (depends on 8)

A catalyst system according to claim 8, wherein said molar ratio is from 3:1 to 6:1.