POLYOXAMIDE OXYGEN BARRIER

摘要

Oxygen barrier structures such as packages, laminated films, etc. are disclosed. The oxygen barrier has at least one layer comprising a polymer having oxamide units of the formula: <IMAGE> and may further include amide units selected from the formulae: <IMAGE> wherein R and R' are independently hydrocarbyl radicals of from 2 to 20 carbon atoms, and R'' is a hydrocarbyl radical of from 1 to 18 carbon atoms. The polyoxamide or copoly(amide-oxamide) layer has an oxygen permeability which, at a high relative humidity, is less than or about the same as the oxygen permeability at a low relative humidity. Also disclosed is a method of protecting an article such as a foodstuff against oxidation by packaging the article with the oxygen barrrier structure.