C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/209, 252/53
C08G 63/183 (2006.01) B01J 23/00 (2006.01) B01J 23/02 (2006.01) B01J 23/06 (2006.01) B01J 23/76 (2006.01) C08G 63/82 (2006.01) C08G 63/83 (2006.01) C08G 63/86 (2006.01)
Patent
CA 2016760
ABSTRACT OF THE INVENTION CATALYST SYSTEM AND PROCESS FOR PREPARING POLYETHYLENE TEREPHTHALATE A novel catalyst system, a process for using the novel catalyst system, and a product made from the process is described. The novel catalyst system is specific for producing polyethylene terephthalate made from reacting terephthalic acid and ethylene glycol, wherein the catalyst system includes antimony; cobalt and/or zinc, and at least one of zinc, magnesium, manganese or calcium. The antimony is generally present from about 150 ppm to about 1100 ppm. The cobalt and/or zinc is usually present from about 5 ppm to about 60 ppm, and the zinc, magnesium, manganese or calcium, as the third component, is generally present from about 10 ppm to about 150 ppm. The. amounts of all catalyst components are based on the theoretical yield of the polymer. Using the novel catalyst system to produce PET drastically increases the polymerization rate. In the process, the novel catalyst system can be introduced any time before the polycondensation stage of the manufactured process.
Mason James D.
Nichols Carl S.
Hoechst Celanese Corporation
Mason James D.
Nichols Carl S.
Smart & Biggar
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