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 systems for the polymerization of poly(ethylene terephthalate) having excellent properties for fabrication of fibers and films. The catalyst-inhibitor systems comprise a combination of organic or inorganic salts of manganese and cobalt; titanium alkoxides; organic salts of alkali metals or alkaline earth metals; and a phosphate ester. This invention also is directed to an improved method of preparing synthetic linear polyesters utilizing the new catalyst-inhibitor systems.
Claims22
Process for producing polyethylene 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 organic salt of an alkali metal or alkaline earth metal, the manganese salts being present in the amount of about 20-110 ppm Mn, the cobalt salts being present in the amount of about 5-35 ppm Co, the titanium alkoxide being present in the amount of about 20-60 ppm Ti, and the organic salt of an alkali metal or alkaline earth metal being present in the amount of about 7-35 ppm metal, all parts by weight based on the acid fraction of the polyester.
Catalyst system for the production of synthetic linear polyesters comprising a mixture of manganese salts and cobalt salts with a titanium alkoxide and organic salt of an alkali metal or alkaline earth metal, the manganese salts being present in the amount of about 20-110 parts by weight Mn, the cobalt salts being present in the amount of about 5-35 parts by weight Co, the titanium alkoxide being present in the amount of about 20-60 parts by weight Ti, and the organic salt of an alkali metal or alkaline earth metal being present in the amount of about 7-35 parts by weight alkali metal or alkaline earth metal.
Catalyst system for the production of polyethylene terephthalate comprising in catalytic amounts, in combination, salts of manganese and cobalt and an organic lithium salt with a titanium alkoxide and a phosphate ester.
Dependencies are inferred from the claim text.