Abstract: A composite barrier membrane coated on a substrate and membrane is formed by phase inversion technique utilizing a water-insoluble wax and a water-insoluble polymer dissolved in a solvent. The barrier membrane coated upon the substrate is used to control transmembrane transport of a liquid and a gas. The substrate can be a starch based food package material, a protein based food package materials, a natural fabric, a synthetic fabric, or a paper product.

Abstract: A composite barrier membrane coated on a substrate and membrane is formed by phase inversion technique utilizing a water-insoluble wax and a water-insoluble polymer dissolved in a solvent. The barrier membrane coated upon the substrate is used to control transmembrane transport of a liquid and a gas. The substrate can be a starch based food package material, a protein based food package materials, a natural fabric, a synthetic fabric, or a paper product.

Abstract: The present invention provides a method for fabricating an asymmetric fluoropolymer membrane comprised of a fluoropolymer material, the membrane having a first surface comprised of a dense layer of the fluoropolymer material, and an opposite second surface comprised of a porous layer of the fluoropolymer material, comprising the steps of:(a) dissolving a fluoropolymer material in a solvent to form a solution;(b) depositing the solution on a casting surface; and(c) removing the solvent from the solution, thereby precipitating the membrane therefrom.The present invention also provides asymmetric fluoropolymer membranes comprised of a fluoropolymer material, wherein the membrane has a first surface comprised of a dense layer of the fluoropolymer material, and an opposite second surface comprised of a porous layer of the fluoropolymer material, and provides compositions for making the same.