Abstract: A method for making polyethylene terephthalate resin in which a titanium-nitride polycondensation catalyst is introduced during the initial stages of esterification or transesterification. The titanium-nitride polycondensation catalyst may be added to a mixture containing a terephthalate component and a diol component during the formation of a polyethylene terephthalate precursor. Subsequent polycondensation of the polyethylene terephthalate precursor forms a polyethylene terephthalate polymer.

Abstract: The present invention relates to titanium-catalyzed polyethylene terephthalate resins that are capable of being formed into articles (e.g., carbonated soft drink and water bottle preforms) at reduced injection-molding cycle times. In particular, the titanium-catalyzed polyethylene terephthalate resins of the present invention can be formed into carbonated soft drink bottle preforms at reduced injection-molding cycle times to yield high-clarity, carbonated soft drink bottles that possess satisfactory resistance to stress cracking and thermal creep.

Abstract: The invention embraces polymer resins, such as polyethylene terephthalate resin, that includes surface-compatibilized alumina. The invention also embraces methods of making polyethylene terephthalate resins that are capable of being formed into low-haze, high-clarity articles possessing reduced coefficient of friction.