Process and catalyst inhibitor systems for preparing synthetic linear polyesters
AssigneeEastman Kodak Company
InventorsNicholas C. Russin, Ronald A. Tershansy, Charles J. Kibler
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Abstract
Catalyst-inhibitor system for the polymerization of poly(ethylene terephthalate) having excellent properties for fabrication of fibers and films. The catalyst-inhibitor system comprises a combination of organic or inorganic salts of manganese and cobalt; titanium alkoxides; an antimony compound; and a phosphate ester. This invention also is directed to an improved method of preparing synthetic linear polyesters utilizing the new catalyst-inhibitor system.
Claims22
Process for producing poly(ethylene terephthalate) comprising reacting dimethyl terephthalate and ethylene glycol at a temperature sufficient to effect ester interchange and in the presence of a catalyst system comprising a mixture of salts of manganese and cobalt with a titanium alkoxide and an antimony compound, the manganese salts being present in the amount of about 25-110 ppm Mn, the cobalt salts being present in the amount of about 10-100 ppm Co, the titanium alkoxide being present in the amount of about 20-60 ppm Ti, and the antimony compound being present in the amount of about 50-300 ppm Sb, all parts by weight based on the acid fraction of the polyester.
Catalyst system comprising a mixture of manganese salts and cobalt salts with a titanium alkoxide and an antimony compound, the manganese salts being present in the amount of about 25-110 parts by weight Mn, the cobalt salts being present in the amount of about 10-100 parts by weight Co, the titanium alkoxide being present in the amount of about 20-60 parts by weight Ti, and the antimony compound being present in the amount of about 50-300 parts by weight Sb.
Catalyst system for the production of poly(ethylene terephthalate) comprising in catalytic amounts, in combination, salts of manganese, cobalt and an antimony compound with a titanium alkoxide and a phosphate ester.
Dependencies are inferred from the claim text.