Abstract: The invention provides polyester polymers suitable for production of monolayer and multilayer preforms and containers by a process of injection molding or co-injection molding and stretch blow molding technology for monolayer and multilayer containers. Containers of the invention not only have adequate CO2 barriers, but also have adequate O2 and UV barriers, high thermal stability, and burst strength to withstand tunnel pasteurization processes at about 60° C. for 20-30 minutes at 10 bar CO2 pressure for beer applications. There will further be no limitations due to humidity in respect of processing the resin/preforms and storage of preforms beyond what is required for normal PET. The polymers of the invention do not possess tie layer nor delamination problems and satisfy recycling criteria.

Abstract: The invention relates to modified Polyethylene Naphthalate (PEN) polymers with fast crystallizing properties, which helps in crystallization of amorphous PEN resin prior to its solid state polymerization (SSP).

Abstract: The present invention relates to a PET resin and a process for producing polyethylene terephthalate (PET) resin having conventional catalysts such as antimony, titanium, tin or germanium compounds and a glycol insoluble tungsten compound or tungsten trioxide or tungsten carbide as co-catalyst. The tungsten compound as a co catalyst increases the rates of solid state polymerization and improves the ‘L’ color value.