# US 4,391,737 A · Catalysts for ring-opening copolymerization of cycloolefins

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- Number: US 4,391,737 A
- Document ID: US4391737A
- Status: Granted
- Kind: A
- Application number: 06/272,635
- Filed: 1981-06-11
- Granted: 1983-07-05
- Earliest claimed: 1981-06-11
- Assignees: The Goodyear Tire & Rubber Company
- Inventors: Anthony J. Bell
- Web page: https://patentgrep.com/patent/US4391737A

## 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 for the ring-opening copolymerization of a hexachlorocyclopentadiene-1,5-cyclooctadiene adduct and a cycloolefin, other than cyclohexene, having 4 to 12 carbon atoms and containing at least one non-conjugated vinylene double bond. Owing to modification by oxy bidentate-type ligands, the chlorotungsten catalyst system affords a more favorable comonomer reactivity ratio and is thus utilized. The catalyst comprises a compound of (a) the reaction product of tungsten hexachloride and a 1,2- or 1,3- dioxy compound; and a compound (b) having the formula R-AlCl.sub.2 where R is an alkyl group having from 2 to 5 carbon atoms.

## Claims

### Claim 1

A catalyst for a ring-opening copolymerization, consisting of:
a compound of (a) the reaction product of tungsten hexachloride and a 1,2- or 1,3-dioxy compound selected from the group consisting of 2,4-pentadione, 2-formylphenol, 1,3-diphenyl-1,3-propanedione, said reaction product forming a bidentate ligand; and a compound (b) having the formula R-AlCl.sub.2 wherein R is an alkyl group having from 2 to 5 carbon atoms, the molar ratio of (b) to (a) ranging from about 2 to about 6, the amount of said tungsten chloride to said dioxy compound ranging from 0.9 moles to about 1.5 moles,
said bidentate ligand causing a more favorable comonomer reactivity ratio in the ring-opening copolymerization of Hex COD monomer and a cycloolefin monomer other than cyclohexene, said cycloolefin having from 4 to 12 carbon atoms and at least one non-conjugated double bond.

### Claim 2 (depends on 1)

A catalyst according to claim 1, wherein said organoaluminum compound is selected from the group consisting of ethylaluminum dichloride, isobutylaluminum dichloride, n-propylaluminum dichloride.

### Claim 3 (depends on 2)

A catalyst according to claim 2, wherein said molar ratio of (b) to (a) ranges from about 3.5 to about 4.5.

### Claim 4 (depends on 3)

A catalyst according to claim 3, wherein said dioxy compound is 2,4-pentadione, and wherein said organoaluminum compound is ethylaluminum dichloride.