C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
204/202, 18/29,
C08J 5/22 (2006.01) B01D 67/00 (2006.01) B01D 69/10 (2006.01) B01D 71/32 (2006.01) C08F 214/26 (2006.01) C08F 216/14 (2006.01) C08J 3/09 (2006.01) C08J 5/18 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)
Patent
CA 1287712
ABSTRACT The invention is a method for forming a polymer film using a removable substrate comprising the steps of: (a) forming a dispersion of a perfluori- nated polymer containing sites convertible to ion exchange groups dispersed in a dispersant having: a boiling point less than 110°C; a density of from 1.55 to 2.2; and a solubility parameter of from greater than 7.1 to 8.2 hildebrands; (b) depositing the dispersion onto the removable substrate; (c) removing the dispersant from the disper- sion; and (d) removing the substrate. Optionally, the removable substrate is provided with a roughened surface. Particularly preferred as a dispersant is a compound represented by the general formula: XCF2-CYZX' wherein: X is selected from F, Cl, Br, and I; X' is selected from Cl, Br, and I; Y and Z are independently selected from H, F, Cl, Br, I and R'; R' is selected from perfluoroalkyl radicals and chloroperfluoroalkyl radicals having from 1 to 6 carbon atoms. The most preferred dispersant is 1,2-dibromo- tetrafluoroethane.
510623
Smart & Biggar
The Dow Chemical Company
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