Abstract: An electronic article having a thin film of a triazine ring-containing fluoropolymer obtained by trimerization of a cyano group of a cyano group-containing fluoropolymer having a polymerization unit of the formula (1): —[CF2—CF(A1)]—  (1) wherein A1 is —OR1CN, —CN or —R1CN, and R1 is a C1-C15 polyfluoroalkylene group which may have an ether bond.

Abstract: An adhesive fluorine-containing polymer comprising a fluorine-containing polymer having hydrogen atoms bonded to carbon atoms of its main chain and a grafting compound having a linking group capable of grafting to the fluorine-containing polymer and a functional group capable of providing an adhesive property, grafted to the fluorine-containing polymer.

Abstract: A heterogeneous ion exchange membrane comprising an ion exchange resin and a binder polymer, wherein the binder polymer is a polymer containing at least a mixture comprising low density polyethylene and ethylene-propylene rubber or ethylene-propylene-diene rubber.

Abstract: A porous ion exchanger which has a porous structure having ion exchange resin particles bound by a binder polymer, and which has a water permeability of at least 30 kg.multidot.cm.sup.-1 .multidot.hr.sup.-1 under a pressure of 0.35 kg/cm.sup.2.

Abstract: An adhesive fluorine-containing polymer comprising a fluorine-containing polymer having hydrogen atoms bonded to carbon atoms of its main chain and a grafting compound having a linking group capable of grafting to the fluorine-containing polymer and a functional group capable of providing an adhesive property, grafted to the fluorine-containing polymer.

Abstract: A cation exchange membrane for electrolysis, which comprises at least 2 layers of fluorine-containing polymer films having sulfonic acid groups, wherein a first layer facing a cathode is made of a three component polymer of the following monomers (A), (B) and (C) and has a thickness of from 50 to 150 .mu.m, and a second layer has a thickness of from 50 to 300 .mu.m:(A) CF.sub.2 =CF(OCF.sub.2 CFCF.sub.3).sub.m O(CF.sub.2).sub.n SO.sub.3 Mwherein m=0 or 1, n=1 to 5, and M is hydrogen or an alkali metal, ##STR1## wherein m=0 or 1, and Rf is a C.sub.1-10 perfluoroalkyl group.

Abstract: A method for producing a fluorinated polymer containing fluoroolefin units as the main constituting units, wherein CF.sub.3 (CF.sub.2).sub.n CH.sub.2 CH.sub.3 or CF.sub.3 (CF.sub.2).sub.n H, wherein n is an integer of from 1 to 8), the is used as the polymerization medium, and CF.sub.2 ClCF.sub.2 CHClF and/or CF.sub.3 CF.sub.2 CHCl.sub.2 as a chain transfer agent.Using the polymerization medium which is less likely to bring about an environmental destruction, it is possible to obtain a fluorinated polymer excellent in the heat resistance, solvent resistance, chemical resistance, etc. Further, the above chain transfer agent has good compatibility with the polymerization medium which scarcely brings about the environmental destruction, whereby it is possible to efficiently produce a fluorinated polymer excellent in the heat resistance and solvent resistance.

Abstract: A bipolar membrane comprising a cation exchange membrane, an anion exchange membrane and an inorganic ion exchanger layer having a thickness of from 0.01 to 100 .mu.m present at the interface between the cation exchange membrane and the anion exchange membrane.

Abstract: A method for producing an acid and/or an alkali metal hydroxide, from a neutral salt by electrodialysis employing a bipolar membrane and an anion exchange membrane and/or a cation exchange membrane, wherein as the anion exchange membrane, an anion exchange membrane made of a polymer having repeating units of the formula: ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 is a hydrogen atom or an alkyl group having up to two carbon atoms, and having an ion-exchange capacity of from 1 to 5 meq/g dry resin, is used.

Abstract: A method for hydrogen ion-selective electrodialysis, wherein from an aqueous solution containing hydrogen ions on an anode side, the hydrogen ions are selectively permitted to permeate through a membrane to a cathode side, wherein the membrane is a double layer ion exchange membrane comprising an anion exchanger layer on the anode side and a cation exchanger layer on the cathode side, and the anion exchanger layer has an ion exchange capacity of from 0.5 to 4 meq/g dry resin, a fixed ion concentration of from 1 to 10 meq/g H.sub.2 O, a thickness of from 0.1 to 150 .mu.m and an electrical resistance of at most 1 .OMEGA..multidot.cm.sup.2 as measured in a 0.5 mol/l sulfuric acid solution.

Abstract: A method for separating and recovering an acid, which comprises contacting to one side of a diffusion dialysis membrane an acid solution containing an acid having an acid radical with a formula weight of at most 200 and impurities and to the other side of the membrane water or a dilute acid solution, to separate and recover the acid in the solution, wherein the diffusion dialysis membrane comprises a cation exchange membrane having certain specific properties or comprises a main layer of an anion exchanger and a surface layer of the cation exchange membrane having certain specific properties formed on the main layer at the side of which is contact with the acid solution.

Abstract: A floor nozzle for a vacuum cleaner of the present invention has an auxiliary agitator provided outside the lateral wall of a main body of the nozzle. The auxiliary agitator is covered by a protecting cover, so as to ensure safety during use. Moreover, a stirring member, a dust outlet and confirmation holes allow dust to be discharged out of the main body more easily and smoothly, while preventing burning or breaking of the agitator.

Abstract: A cation exchange fluoropolymer membrane comprising at least three integrally laminated layers including a main layer made of a perfluorocarbon polymer having carboxylic acid groups as its ion exchange groups with an ion exchange capacity of from 1.4 to 2.0 meq/g dry resin and having a thickness of from 50 to 250 .mu.m, a sulfonic acid film surface layer formed on one side of said main layer, made of a perfluorocarbon polymer having sulfonic acid groups as its ion exchange groups with an ion exchange capacity of from 0.5 to 1.5 meq/g dry resin and having a thickness of from 5 to 50 m, and a carboxylic acid film surface layer formed on the other side of said main layer, made of a perfluorcarbon polymer having carboxylic acid groups as its ion exchange groups with an ion exchange capacity of from 0.5 to 1.3 meq/g dry resin and having a thickness of from 5 to 50 .mu.m, said sulfonic acid film surface layer and carboxylic acid film surface layer constituting the outer-most layers, respectively.

Abstract: A method for producing an alkali metal hydroxide by electrolysis in an electrolytic cell comprising an anode compartment and a cathode compartment, which comprises supplying an alkali metal chloride to the anode compartment and water or a dilute alkali metal hydroxide to the cathode compartment, wherein a fluorine-containing cation exchange membrane comprising a first outer layer of a perfluorocarbon polymer having --SO.sub.3 M groups (wherein M is an alkali metal) with a thickness of at least 5 .mu.m, and a second layer of a perfluorocarbon polymer having --CO.sub.2 M groups (wherein M is an alkali metal) and a water content of from 2 to 7% by weight in a 45% wt % NaOH aqueous solution with a thickness of at least 5 .mu.m, the water content of the first layer being higher than that of the second layer, is disposed with the first layer facing the cathode compartment.

Abstract: A fluorosilicone polymer comprising from 30 to 99.95 mol % of units of a cyclic trisiloxane of the formula (a) --R.sub.f CH.sub.2 CH.sub.2 (R.sup.1)SiO--.sub.3, from 0.05 to 10 mol % of units of a cyclic siloxane of the formula (b) --R.sup.2 R.sup.3 SiO--.sub.m, and from 0 to 69.95 mol % of units of a cyclic siloxane of the formula (c) --R.sup.4 R.sup.5 SiO--.sub.n, wherein each of R.sup.1, R.sup.3, R.sup.4 and R.sup.5 is a monovalent organic group, R.sub.f is a perfluoroalkyl group having from 4 to 6 carbon atoms, R.sup.2 is an alkenyl group, and each of m and n is an integer of from 3 to 6.

Abstract: An electrolytic cation exchange membrane which comprises a first film made of a fluorinated polymer having cation exchange groups and containing a fibrillated tetrafluoroethylene polymer and a second film laminated thereon, made of a fluorinated polymer having carboxylic acid groups as its ion exchange groups, said first film having a greater thickness and smaller specific electric resistance than said second film.

Abstract: A multi-layered diaphragm for electrolysis, which comprises a porous layer of a fluorine-containing polymer having a pore diameter of from 0.05 to 10 .mu.m, a porosity of from 30 to 95% and a thickness of from 30 to 450 .mu.m and with its interior and anode-side surface being hydrophilic, and an ion exchange resin layer supported on the cathode side thereof and having a thickness thinner than the porous layer but of at least 5 .mu.m and an ion exchange capacity of from 0.5 to 2.0 meq/g dry resin, the total thickness being from 35 to 500 .mu.m.

Abstract: A process for producing potassium hydroxide by electrolysis of potassium chloride in an electrolytic cell comprising an anode compartment and a cathode compartment partitioned by a cation exchange membrane, which process comprises supplying potassium chloride to the anode compartment for the electrolysis to form potassium hydroxide in the cathode compartment, characterized in that said cation exchange membrane is a multi-layer membrane comprising at least two layers including a main layer made of a perfluorocarbon polymer having carboxylic acid groups as its ion exchange groups with an ion exchange capacity of from 0.9 to 1.6 meq/g dry resin and having a thickness of from 80 to 300 .mu.m and a sulfonic acid film surface layer on the anode compartment side, made of a perfluorocarbon polymer having sulfonic acid groups as its ion exchange groups with an ion exchange capacity of from 0.5 to 1.5 meq/g dry resin and having a thickness of from 5 to 50 .mu.m.

Abstract: A fluorinated cation exchange membrane is formed using a copolymer of a fluorovinyl ether (I) having the formulaCF.sub.2 .dbd.CF--O--CF.sub.2 --CFXOCF.sub.2).sub.l (CFX').sub.m (CF OCFX").sub.n Awherein l is 0 to 3; m is 2 to 6; n is 0 to 4 and one of l and n is not zero and l+m+n.gtoreq.3; X, X' and X" are the same or different and each respectively represent --F or --CF.sub.3 ; A represents --CN,--COF, --COOH, --COOR,--COOM or --CONR.sub.2 R.sub.3 ; R.sub.1 represents a C.sub.1-10 alkyl group; and M represents an alkali metal or a quaternary ammonium salt; and a fluorinated olefin (II), or a hydrolyzed copolymer thereof. The fluorinated cation exchange membrane is used for production of a halogen and an alkali metal hydroxide by electrolysis of an alkali metal hydride.

Abstract: An electrolytic cation exchange membrane comprises a first film made of a fluorinated polymer having cation exchange groups and a second film laminated thereon, made of a fluorinated polymer having carboxylic acid groups as its ion exchange groups and containing the following repeating units (A), (B) and (C) and having a smaller thickness and greater specific electric resistance than the first film; ##STR1## where each of X and X' is --F, --Cl or --CF.sub.3, R.sub.f is a perfluoroalkyl group having from 1 to 10 carbon atoms, M is hydrogen or an alkali metal and Y is selected from the group consisting of --CF.sub.2).sub.x, --O--CF.sub.2).sub.x, ##STR2## where each of x and y is an integer of from 0 to 10 and Z is --F or R.sub.f as defined above, provided that B/A+B+C (molar ratio) and C/A+B+C (molar ratio) are from 0.01 to 0.3 and from 0.05 to 0.5, respectively.