Lithium and potassium copolysilicate barrier coatings

摘要

A method for coating polymeric substrate articles with a barrier coating that imparts improved vapor, gas or aroma permeability characteristics to the coated substrate, without efflorescence or hazing of the dried coating. The method employs a lithium-potassium copolysilicate of the formula (L2O)x(K2O)1-x(SiO2)y, wherein y is between 1 and 10, if x is less than 1; or y is greater than 4.6, if x is 1.