C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
400/9003, 400/90
C08J 3/11 (2006.01) C08F 214/18 (2006.01) C08J 5/18 (2006.01) C08J 5/22 (2006.01) C08K 5/02 (2006.01) C08L 27/12 (2006.01)
Patent
CA 1298927
-35- ABSTRACT The invention is a dispersion for the manufacture of films and articles for use in electrolytic cells, fuel cells and gas or liquid permeation units, wherein the dispersion comprises a fluorinated polymer containing sites convertible to ion exchange groups dispersed in a dispersant having: a boiling point less than 110°C; a solubility parameter of from greater than 7.1 to 8.2 hildebrands, and wherein the densities of the dispersant and the fluorinated polymer are selected such that they are balanced with each other. Preferred is a dispersant having the general formula: XCF2-CYZX' wherein: X is selected from F, Cl, Br, and I; X1 is selected from Cl, Br, and I; Y and Z are independently selected from H, F, Cl, Br, I and R'; 34,247-F -35- -36- R' is selected from perfluoroalkyl radicals and chloroperfluoroalkyl radicals having from 1 to 6 carbon atoms. Particularly preferred as a dispersant is 1,2- dibromotetrafluoroethane. 34,247 -36-
510632
Birdwell Jeffrey D.
Carl William P.
Moritz Burt E. III
Smart & Biggar
The Dow Chemical Company
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