OXYGEN SCAVENGING POLYESTER COMPOSITION

摘要

The present disclosure provides a polyester polymer product which contains partially or fully cobalt-neutralized organic sulphonic acid component and which is substantially free of ether and its preparation. The present disclosure also provides an oxygen scavenging composition made from a mixture of the polyester polymer product of the present disclosure, an organic oxidizable polymeric component and optionally at least one additional polyester component. The present disclosure further provides a packaging article defined by walls having an oxygen transmission rate (OTR) less than 0.2 cc·m−2 day−1 at 0.28 mm thickness and its preparation.

主权项

1. A process for preparing a polyester polymer product comprising at least partially cobalt-neutralized organic sulphonic acid component and having ether content less than 8 mole %, said process comprising the following steps:
a. subjecting at least one dicarboxylic acid or mono-esters, di-esters or anhydrides thereof and at least one diol to esterification in a vessel by heating under pressure to obtain an esterified product; b. adding at least one at least partially cobalt-neutralized organic sulphonic acid to the esterified product to obtain a mixture; c. removing at least partially the diol from the esterified product or said mixture; and d. heating the mixture under reduced pressure to obtain the polyester polymer product.