Catalysts for ring-opening copolymerization of cycloolefins
AssigneeThe Goodyear Tire & Rubber Company
InventorAnthony J. Bell
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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.
Claims4
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.
Dependencies are inferred from the claim text.