C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 4/645 (2006.01) B01J 31/04 (2006.01) B01J 31/22 (2006.01) B01J 31/26 (2006.01) C08G 63/183 (2006.01) C08G 63/82 (2006.01) C08G 63/85 (2006.01) B01J 21/06 (2006.01) C08G 63/83 (2006.01) C08G 63/84 (2006.01) C08G 63/87 (2006.01)
Patent
CA 2330283
The present invention is based upon the discovery that nontitanyl oxalates can enhance the catalytic functionality of titanyl oxalate catalysts. This invention provides a novel catalytic composition containing a titanyl oxalate catalyst and a metallic oxalate catalyst enhancer and optionally containing a metallic cocatalyst such as an antimony based catalyst. A synergistic relationship has been discovered between titanyl oxalate catalyst and the catalyst enhancer. A synergistic relationship has also been discovered between the titanyl oxalate catalyst, catalyst enhancer and a metallic cocatalyst such as antimony oxide or antimony triacetate. Also provided is an improved process of producing polyester by the polycondensation of polyester forming reactants in the presence of a catalytically effective amount of a polycondensation catalyst, wherein the improvement comprises utilizing, as the polycondensation catalyst, the novel catalyst composition containing a titanyl oxalate such as lithium titanyl oxalate and a catalyst enhancer such as a nontitanyl metallic oxalate like lithium oxalate and optionally containing a metallic catalyst such as antimony oxide or antimony triacetate. The improved process produces an improved polyester having lower acetaldehyde numbers and good color. The titanyl oxalate/catalyst enhancer composition can be used as a polycondensation catalyst in combination with other catalysts to achieve synergistic catalytic activity. Preferred is a combination of lithium titanyl oxalate, Li2TiO(C2O4)2, lithium oxalate, Li2(C2O4)2 with antimony oxide or antimony triacetate or antimony trisglycoxide.
Dowling Conor M.
Seshadri Sri R.
Atofina Chemicals Inc.
Borden Ladner Gervais Llp
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