WO2007101415-A2  ALLCOCK H R ET AL: "Phenylphosphonic acid functionalized poly(aryloxyphosphazenes)" MACROMOLECULES, ACS, WASHINGTON, DC, US, Bd. 35, 26. Maerz 2002 (2002-03-26), Seiten 3484-3489, XP002409397 ISSN: 0024-9297;  KERRES J ET AL: "NEW SULFONATED ENGINEERING POLYMERS VIA THE METALATION ROUTE I. SULFONATED POLY(ETHERSULFONE) PSU UDEL VIA METALATION-SULFINATION-OXI DATION" JOURNAL OF POLYMER SCIENCE, POLYMER CHEMISTRY EDITION, INTERSCIENCE POUBLISHERS, NEW YORK, NY, US, Bd. 34, Nr. 12, 1996, Seiten 2421-2438, XP001058069 ISSN: 0360-6376;  MIYATAKE K ET AL: "New poly (arylene ether) s with pendant phosphonic acid groups" JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY, WILEY, NEW YORK, NY, US, Bd. 39, 2001, Seiten 3770-3779, XP002409394 ISSN: 0887-624XWO2007101415-A3  MIYATAKE K ET AL: "New poly (arylene ether) s with pendant phosphonic acid groups" JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY, WILEY, NEW YORK, NY, US, Bd. 39, 2001, Seiten 3770-3779, XP002409394 ISSN: 0887-624X;  ALLCOCK H R ET AL: "Phenylphosphonic acid functionalized poly(aryloxyphosphazenes)" MACROMOLECULES, ACS, WASHINGTON, DC, US, Bd. 35, 26. Maerz 2002 (2002-03-26), Seiten 3484-3489, XP002409397 ISSN: 0024-9297;  KERRES J ET AL: "NEW SULFONATED ENGINEERING POLYMERS VIA THE METALATION ROUTE I. SULFONATED POLY(ETHERSULFONE) PSU UDEL VIA METALATION-SULFINATION-OXI DATION" JOURNAL OF POLYMER SCIENCE, POLYMER CHEMISTRY EDITION, INTERSCIENCE POUBLISHERS, NEW YORK, NY, US, Bd. 34, Nr. 12, 1996, Seiten 2421-2438, XP001058069 ISSN: 0360-6376;  MIYATAKE K ET AL: "New poly (arylene ether) s with pendant phosphonic acid groups", JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY, WILEY, NEW YORK, NY, US, vol. 39, 2001, pages 3770 - 3779, XP002409394, ISSN: 0887-624X,relevantClaims[1-19],relevantPassages[&lt;pp&gt;W&lt;/pp&gt;];  ALLCOCK H R ET AL: "Phenylphosphonic acid functionalized poly(aryloxyphosphazenes)", MACROMOLECULES, ACS, WASHINGTON, DC, US, vol. 35, 26 March 2002 (2002-03-26), pages 3484 - 3489, XP002409397, ISSN: 0024-9297,relevantClaims[1-19],relevantPassages[&lt;pp&gt;W&lt;/pp&gt;];  KERRES J ET AL: "NEW SULFONATED ENGINEERING POLYMERS VIA THE METALATION ROUTE I. SULFONATED POLY(ETHERSULFONE) PSU UDEL VIA METALATION-SULFINATION-OXI DATION", JOURNAL OF POLYMER SCIENCE, POLYMER CHEMISTRY EDITION, INTERSCIENCE POUBLISHERS, NEW YORK, NY, US, vol. 34, no. 12, 1996, pages 2421 - 2438, XP001058069, ISSN: 0360-6376,relevantClaims[1-19],relevantPassages[&lt;pp&gt;W&lt;/pp&gt;]