| 摘要 |
<p>1415374 Coated fabrics E I DU PONT DE NEMOURS & CO 12 Jan 1973 [13 Jan 1972 27 Dec 1972] 1855/73 Heading B2E A fabric is coated by applying a polymercontaining liquid medium to one surface of the fabric while the opposite surface of the fabric is open to the atmosphere, to obtain wicking of the medium through the thickness of the fabric and then passing the fabric through a polymer-containing liquid medium. The method is particularly useful for applying coatings of polytetrafluoroethylene to glass fabrics. The polytetrafluoroethylene may be applied as an aqueous dispersion which may be sintered after application. The dispersion generally contains polymer particles of 0.1 to 0.5 microns and a surfactant is preferably present, such as ethoxylated aliphatic alcohols and ethoxylated alkyl phenols, or a solid silicone block copolymer. The tetrafluoroethylene may be copolymerised with other monomers such as hexafluoropropylene, perfluoro(alkylvinyl ethers) such as perfluoro(propylvinyl ethers) and perfluoro-(2-methylene-4-methyl-1, 3-dioxolane).</p> |
