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 monomers to produce 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; and optionally
d) 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.
本发明提高了氧清除组合物的效果,并保持了聚合物颜色特性的极佳平衡。本发明涉及一种改进的氧清除 PET 基共聚物,其中包含基于 PET 聚合物的约 10 至约 120 ppm 的
钴和基于 PET 聚合物的约 15 至约 150 ppm 的
锌。本发明还包括一种制备 PET 基氧清除共聚物的工艺,包括以下步骤: 1:
a) 聚合单体以生产 PET 基聚合物;
b) 在所述聚合步骤中添加 Zn、Co 和氧清除化合物;
c) 将所述氧清除化合物与所述 PET 聚合物共聚形成共聚物;以及
d) 挤压所述共聚物。
本发明还包括一种
氧气阻隔容器,该容器具有一层或多层基于 PET 的氧清除共聚物,基于所述 PET 聚合物的 Co 含量约为 10 至 120 ppm,基于所述 PET 聚合物的 Zn 含量约为 15 至 150 ppm;以及氧清除化合物,其中所述 Co 和所述 Zn 是所述氧清除化合物的催化剂。