Abstract: Novel alloy/blends barrier resins consisting of a composition of Polyethylene Terephthalate (PET) and Polytrimethylene Naphthalate (PTN) or PET and Polybutylene Naphthalate (PBN) exclusively for packaging beverages like beer in a monolayer bottle outperforming the existing other barrier multi-layer bottles is described. The alloy/blends of PET/PTN and PET/PBN are produced by using in situ polymerization or melt blending the two polymers or compounding the two polymers to get the PTN and PBN in a PET polymer matrix. The composition of PET alloy/blends with PTN and PBN additionally contains other barrier improving additives. Incorporating a suitable oxygen scavenger in these new alloy/blends and converting to a stretch blow molded bottle, with or without heat setting, allows this monolayer bottle to be tunnel pasteurized for protecting beverages like beer filled at specific gas pressure to its maximum shelf life of >180 days keeping under control both oxygen ingress and carbon dioxide egress.

Abstract: The present invention provides an Oxygen scavenging composition as a concentrate master batch to act as active and passive barrier, said composition comprising a resin carrier which is an alloy of PET with PTN, or PBN or PBT, mixed micron sized and nano-sized iron particles, an alkali metal bisulphate and ascorbate, a metal halide and additives. The iron particle mixture with a particle size in the range of 1 to 50 micron along with nano sized iron particles of 5 to 50 nanometers (nm) having an additional enhanced rate of oxygen absorption. The oxygen scavenging composition also includes metal halide and ascorbates and bisulphates of alkali metals. The oxygen scavenging composition of the present invention as a master batch in a polyester carrier resin containing barrier, color and U.V.