C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/187
C08G 63/80 (2006.01) C08G 63/18 (2006.01)
Patent
CA 1141079
METHOD FOR PRODUCTION OF HIGH MOLECULAR WEIGHT POLYESTER WITH LOW CATALYST LEVEL AND LOW CARBOXYL CONTENT ABSTRACT OF THE DISCLOSURE A high molecular weight polyester is dis- closed, having a low carboxyl content, and utilizing a low catalyst level, produced by a two-stage process; a melt process until the intrinsic viscosity of the prepolymer reaches about between 0.15 and 0.45 dl/g, and a solid state polymerization in a fluidized bed until the intrinsic viscosity of the polycondensed polymer reaches at least 0.60 dl/g. The melt process employs addition of excess initial glycol, delayed addition of excess glycol, and delayed addition of catalyst, in any combination, to achieve a low car- boxyl content polyester prepolymer capable of use in the fluidized bed solid state polymerization. This prepolymer with a minimal carboxyl content achieves a maximum solid state polymerization rate in a fluid- ized bed. This prepolymer also permits the use of a very low catalyst level to achieve high product pur- ity and still maintains economically satisfactory polymerization rate.Stability and color clarity of the polycondensed product is obtained by this method.
345377
Smart & Biggar
The Goodyear Tire & Rubber Company
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