Patent ID: 8097662
Filing Date: 2012-01-17
Classification: A23L,B32B,C08K,Y10T

Abstract:
1. A method comprising: preparing a composition for use as an oxygen scavenger which comprises a polyamide which has been solid-stated and a transition metal in an amount of at least 200 ppm in the polyamide, the method comprising the steps of: heat treating the polyamide at a temperature above the glass transition temperature and below the melting temperature of the polyamide while under a low oxygen content atmosphere to form a solid-stated polyamide; the polyamide being solid-stated in the presence of the metal or the metal being added to the polymer after the solid-stating step, and wherein the heat treatment increases the oxygen scavenging performance of the composition by a factor of at least 1.3 as compared to a composition of the transition metal and the same polyamide prepared without a solid-stating step.