초록 ▼

Improved active oxygen scavenging packaging articles optionally further comprising SiO2 and/or EAA coatings are disclosed. Also improved active oxygen scavenging copolycondensates and their use in packaging articles are disclosed. Specifically disclosed are (1) the use of an oxidation moderator or c

Improved active oxygen scavenging packaging articles optionally further comprising SiO2 and/or EAA coatings are disclosed. Also improved active oxygen scavenging copolycondensates and their use in packaging articles are disclosed. Specifically disclosed are (1) the use of an oxidation moderator or controller (anti-oxidant) along with the copolycondensate scavenger and (2) post polymerization treatment of the copolycondensate substantially in the absence of oxygen. The improvements lead to increased oxygen consumption by the active oxygen scavenger and improved packaging characteristics for the active oxygen scavenging copolycondensates.

대표청구항 ▼

1. A process for improving the properties of an oxygen scavenging modified polycondensate consisting essentially of (A) predominantly polycondensate segments selected from the group consisting of polyesters as recited in USA 21 CFR 177.1590 and polyamides and (B) a minor amount of oxygen scavenging

1. A process for improving the properties of an oxygen scavenging modified polycondensate consisting essentially of (A) predominantly polycondensate segments selected from the group consisting of polyesters as recited in USA 21 CFR 177.1590 and polyamides and (B) a minor amount of oxygen scavenging moiety segments selected from the group consisting of polybutadiene monomer, unhydrogenated polybutadiene oligomers, polypropylene oxide oligomers and methyl pendant aromatic compounds by subjecting said modified polycondensate to post polymerization treatment substantially in the absence of oxygen for a time period totaling at least one hour.