Abstract: A blend or blend membrane formed from a hydroxymethylene-oligo-phosphonic acid R-C(P03H2)x(OH)y and a polymer, in which the radical R is any organic radical, x and y are integers, the hydroxymethylene-oligo-phosphonic acid is a product of a reaction involving a carbonic acid, a carbonic acid halide or a carbonic acid anhydride, and the polymer includes a functional group selected from the group consisting of (i) suitable cation exchange groups or their non-ionic precursor and (ii) suitable basic groups.

Abstract: Various blends and blend membranes from low-molecular hydroxymethylene-oligo-phosphonic acids R—C(PO3H2)x(OH)y and polymers, the group R representing any organic group, the polymers containing cation exchanger groups or their nonionic precursors of the type SO2X, X being a halogen, OH, OMe, NR1R2, OR1 with Me being any metal cation or ammonium cation, R1, R2 being H or any aryl- or alkyl group, PDX2, COX and/or basic groups such as primary, secondary or tertiary amino groups, imidazole groups, pyridine groups, pyrazole groups etc. and/or OH groups. Such membranes may also include polymers that are modified with the 1-hydroxymethylene-1,1-bisphosphonic acid group.

Abstract: The invention relates to producing monomer, oligomer and polymer non-fluorinated, partially fluorinated or perfluorinated sulphonic acids by reacting halogenated, low-molecular weight, oligomer or macromolecular arenes with (hydrogen) sulphites, dithionites, sulphides or other reducing sulfur salts, possibly by oxidising sulphur-containing arene intermediates which are formed at a sulphur oxidation degree less than +6 by means of appropriate oxidation agents with formation of corresponding sulphonate functional groups (sulphonic acid, sulfohalogenide, sulphonamide and sulphonic acid ester groups).

Abstract: The invention relates to blends and blend membranes from low-molecular hydroxymethylene-oligo-phosphonic acids R—C(PO3H2)x(OH)y and polymers, the group R representing any organic group and the polymers containing the following functional groups: cation exchanger groups or their nonionic precursors of the type SO2X, X=Hal, OH, OMe, NR1R2, OR1 with Me=any metal cation or ammonium cation, R1, R2=H or any aryl- or alkyl group, POX2, COX and/or basic groups such as primary, secondary or tertiary amino groups, imidazole groups, pyridine groups, pyrazole groups etc. and/or OH groups. Low molecular hydroxymethylene-oligo-phosphonic acids R—C(PO3H2)x(OH)y are preferred in which x=2 and y=1. The invention also relates to low-molecular hydroxymethylene-oligo-phosphonic acids R—C(PO3H2)2(OH)1 and polymers, wherein the group R of the hydroxymethylene-oligophosphonic acid contains an aliphatic or aromatic basic group which ionically interacts with the acidic groups of the polymer or of the polymer mixture.