| abstract |
The present invention improves the effectiveness of the oxygen scavenging composition and maintains an excellent balance in the color properties of the polymer. The present invention relates to an improved oxygen scavenging PET based copolymer comprising from about 10 to about 120 ppm cobalt based on the PET polymer, and from about 15 to about 150 ppm zinc based on the PET polymer. The present invention also comprises a process for preparing a PET based oxygen scavenging copolymer, comprising the steps of:a) polymerizing a PET based polymer;b) adding Zn, Co, and an oxygen scavenging compound during said polymerizing step;c) copolymerizing said oxygen scavenging compound with said PET based polymer to form a copolymer; andd) extruding said copolymer.The present invention also comprises an oxygen barrier container having one or more layers of a PET based oxygen scavenging copolymer having from about 10 to about 120 ppm Co based on said PET polymer, and from about 15 to about 150 ppm Zn based on the PET polymer; and an oxygen scavenging compound wherein said Co and said Zn are catalysts for said oxygen scavenging compound. |