B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
204/202, 117/88.
B01D 71/32 (2006.01) B01D 67/00 (2006.01) B01D 69/10 (2006.01) C08J 3/09 (2006.01) C08J 5/18 (2006.01) C08J 5/22 (2006.01) C08L 27/12 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)
Patent
CA 1270226
-27- ABSTRACT The invention is a method for forming composite polymer films comprising: (a) forming a dispersion of a first perfluorinated polymer containing sites convertible to ion exchange groups and a dispersant, said dispersant having a boiling point less than 110°C; a density of from about 1.55 to about 2.97 grams per cubic centimeter; and a solubility parameter of from about greater than 7.1 to about 8.2 hildebrands; (b) forming a first film of the perfluorinated polymer by depositing the dispersion onto a second polymer film containing ion exchange groups or sites convertible to ion exchange groups; and (c) heating the two films for a time and at a temperature sufficient to fuse the two films to each other. 34,260-F -27- -28- Particularly preferred as a dispersant is a compound represented by the general formula: XCF2-CYZX' wherein: X is selected from F, Cl, Br, or I; X' is selected from Cl, Br, or I; Y and Z are independently selected from H, F, Cl, Br, I, or R'; R' is selected from perfluoroalkyl radicals or chloroperfluoroalkyl radicals having from 1 to 6 carbon atoms. The most preferred dispersant is 1,2- dibromotetrafluoroethane. 34,260-F -28-
510588
Birdwell Jeffrey D.
Carl William P.
Smart & Biggar
The Dow Chemical Company
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