Catalyst system for a polyethylene terephthalate polycondensation
AssigneeRohm and Haas Company
InventorsMichael S. Cholod, Nipun M. Shah
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Abstract
A polyethylene terephthalate polycondensation catalyst system comprises from about 2 parts to about 18 parts of catalyst metal in the form of an alkyl titanate and from about 40 parts to about 300 parts of catalyst metal in the form of an antimony compound, each of said metals being per million parts of polymer product.
Claims24
A polyethylene terephthalate polycondensation catalyst system comprising from about 2 parts to about 18 parts of catalyst metal in the form of an alkyl titanate and from about 40 parts to about 300 parts of catalyst metal in the form of an antimony compound, each of said metals being per million parts of polymer product.
A polyethylene terephthalate polycondensation catalyst system comprising about 10 to about 14 parts of catalyst metal in the form of tetraisopropyl titanate and from about 100 to about 160 parts of catalyst material in the form of antimony trioxide, both metals being per million parts of polymer product, and wherein from about 0.2 to about 0.5 mole percent of the polyethylene terephthalate is branched with a pentaerythritol derived moiety and wherein said polyethylene terephthalate includes up to 2%, based on the number of repeating units of said polyethylene terephthalate, of a comonomer derived from dimethylisophthalate.
Dependencies are inferred from the claim text.