Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 9, 2007
Patent Application Number
10479036
Date Filed
May 31, 2002
Patent Primary Examiner
Patent abstract
An ion exchange fluorocarbon resin membrane having a storage modulus (JIS K-7244), when substituted with tributyl ammonium ions, at a temperature of not less than Tc represented by the following general equations (1-1) to (1-3) of 0.8×106 Pa or more, and a heat of crystal fusion at 270 to 350° C. of 1 J/g or less:Tc (° C.)=55+Tg (EW<750) (1-1)Tc (° C.)=0.444×EW−278+Tg (750≦EW<930) (1-2)Tc (° C.)=135+Tg (EW≧930) (1-3)where Tg designates the peak temperature of loss tangent in the dynamic viscoelasticity measure-ment of the ion exchange fluorocarbon resin membrane (having SO3H as the ends of the side chains).
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