Patent ID: 7648660
Filing Date: 2010-01-19
Classification: B01D,B29K,C08J,H01M,Y02E,Y02P

Abstract:
1. A process for manufacturing a composite membrane comprising: continuously forming a first coating of fluoropolymer-containing liquid medium onto a moving elongate casting substrate, said coating having a selected thickness; continuously contacting elongate ePTFE with said coating on said moving casting substrate to form an inchoate composite structure on said substrate, said thickness of said first coating being selected to at least partially impregnate said ePTFE and form a layer of fluoropolymer-containing liquid medium which, upon drying, forms a layer of fluoropolymer in contact with said substrate and said ePTFE; continuously forming a final coating of fluoropolymer-containing liquid medium on said inchoate composite structure on said moving elongate casting substrate, said final coating having a selected thickness and forming on said inchoate composite structure a layer of fluoropolymer-containing liquid medium which, upon drying, forms a layer of fluoropolymer on said ePTFE; drying said inchoate composite structure; and removing said casting substrate.