Method for the production of a high molecular weight...

Details Method for the production of a high molecular weight... Method for the production of a high molecular weight...

C - Chemistry, Metallurgy

08

G

402/187

C08G 63/80 (2006.01)

Patent

CA 1139493

ABSTRACT OF THE DISCLOSURE A high molecular weight polyester is pro- duced by a two stage process: a partial melt pro- cess until the intrinsic viscosity of the polyester prepolymer reaches from about 0.35 to about 0.62 dl/g, and a solid state polymerization in a static bed until the intrinsic viscosity of the polycondens- ed polymer reaches at least 0.70 dl/g. The melt process employs greater concentrations of initial acid in combination with a heel or the addition of make-up acid to achieve optimal carboxyl content for the polyester prepolymer capable of use in the static bed solid state polymerization. This pre- polymer with an optimal carboxyl content achieves a maximum solid state polymerization rate in a static bed. The production of the high molecular weight polyester by the two stage process minimizes chem- ical instability and deleterious polymerization byproducts.

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