Method of bonding cation exchange membrane of fluorinated polymer
AssigneeAsahi Glass Company, Limited
InventorsTomoki Gunjima, Isamu Takeshita
Life of this patent
Estimating the term…
Abstract
A method of bonding a cation exchange membrane which comprises melt-bonding a part of the cation exchange membrane of a fluorinated copolymer in the form having ion-exchange groups of --COOY wherein Y represents hydrogen atom or a C.sub.1 -C.sub.20 alkyl group, when the cation exchange membrane is used in the form having ion-exchange groups of --(COO).sub.m X wherein X represents an alkali metal, an alkaline earth metal or --NHR.sub.1 R.sub.2 R.sub.3 and R.sub.1 to R.sub.3 respectively represent hydrogen atom or a lower alkyl group and m is a valence of X.
Claims9
In a method for melt bonding a cation exchange membrane, wherein the viscosity of the molten membrane is controlled to within the ring of 10.sup.2 to 10.sup.6 poise in order to affect bonding, which comprises a fluorinated copolymer containing (COO).sub.m X groups as the ion exchange groups, wherein X is an alkali metal, alkaline earth metal or NHR.sub.1 R.sub.2 R.sub.3 wherein R.sub.1, R.sub.2 and R.sub.3 represent hydrogen or a lower alkyl group and m is the valence of X, the improvement which comprises converting said (COO).sub.m X groups to --COOY groups prior to melt bonding, wherein Y represents a C.sub.1 -C.sub.20 alkyl group.
Dependencies are inferred from the claim text.