Patent ID: 7459113

Claim:
A process for making a container from a polyester(s) polymer, comprising feeding polyester particles having a degree of crystallinity of at least 15% and an It.V. of at least 0.70 dL/g to an extrusion zone, melting the particles in the extrusion zone to form a molten polyester polymer composition, and forming a sheet or a molded part from extruded molten polyester polymer, wherein the absolute value of the difference in the It.V. between the center and the surface of the polyester particles fed to the extrusion zone is less than 0.25 dL/g, the polyester particles are not solid state polymerized before introducing said particles into the extrusion zone, and the polyester particles have an acetaldehyde level of 10 ppm or less before introducing said particles into the extrusion zone.