Patent ID: H0002291

Claim:
A method for the production of solid polyester polymer resin comprising: a) esterifying the diacids and diols to form an oligomer mixture with a DP of less than 20; and b) polycondensing the oligomer mixture in the presence of a polycondensation catalyst composition comprising titanium species at a temperature of greater than 284° C. to an IV of about 0.4 dl/g; and c) completing the polycondensation by increasing the IV by at least 0.2 dl/g and cooling the polymer melt temperature to less than 282° C.; and d) solidifying and cutting the molten polyester polymer composition into solid polyester polymer particles; and optionally e) solid state polymerizing the solid polyester polymer particles to increase the IV by more than 0.05 dl/g.