Catalyst and process for producing polyester
AssigneeE. I. Du Pont de Nemours and Company
InventorGeorge R. Goodley
Life of this patent
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Abstract
A cobalt/aluminum/chlorine catalyst for the polymerization of polyesters of terephthalic acid and an ethylene glycol, a process for the preparation of such catalysts, a process for the polymerization of terephthalic acid and an ethylene glycol, a process of spinning fibers of such polymers where reduced spinneret wiping is achieved, and fibers of such polyesters containing catalyst residues of cobalt/ aluminum/chlorine, and films or bottles of said polymer.
Claims11
A process for the production of poly (ethylene terephthalate) polymer which comprises combining a polymerization catalyst formed by combining a cobalt salt that is soluble in ethylene glycol and aluminum compound selected from the group consisting of aluminum chloride and aluminum hydroxychloride in ethylene glycol, where the mole ratio of aluminum to cobalt is 1 to 1 to 16 to 1, with terephthalic acid and ethylene glycol, or low molecular weight poly(ethylene terephthalate) polymer or oligomer, where the concentration of cobalt in the thus formed mixture is in the range of about 10 to 100 parts per million parts of the mixture and polymerizing the mixture.
A poly(ethylene terephthalate) polymer having a NLRV of greater than about 12 containing catalyst residues of cobalt salt and an aluminum compound selected from the group consisting of aluminum chloride and aluminum hydroxychloride.
A process for the production of poly (ethylene terephthalate) fiber in which there is a reduced need to wipe antimony deposits from the spinneret face which comprises melt spinning a molten mixture of poly(ethylene terephthalate) polymer containing catalyst residue of cobalt salt and an aluminum compound selected from the group consisting of aluminum chloride and aluminum hydroxychloride.
A process for the production of poly (ethylene terephthalate) polymer which comprises combining a catalyst solution in ethylene glycol having an aluminum to cobalt mole ratio in the range of 1 to 1 to 16 to 1 and a chlorine to aluminum mole ratio in the range of 0.25 to 3, with terephthalic acid and ethylene glycol, or low molecular weight poly(ethylene terephthalate) polymer or oligomer, where the concentration of cobalt in the thus formed mixture is in the range of about 10 to 100 parts per million parts of the mixture and polymerizing the mixture.
Dependencies are inferred from the claim text.