WO2003060011-A2  KERRES J E AL : "New sulfonated engineering polymers etc" J. POLYMERR SCI.PART A , Bd. 36, 1998, Seiten 1441-1448, XP002241682;  KERRES J ET AL: "Preparation and characterisation of novel basic polysulphone polymers " J. POLYMER SCI. PART A , Bd. 39, Nr. 17, 1. September 2001 (2001-09-01), Seiten 2874-2888, XP002241680;  KERRES J. ET AL: "Development and characterisation of crosslinked ionomer membranes based upon sulfinated and sulphonated PSU" J. MEMBRANE SCIENCE , Bd. 139, 1998, Seiten 227-241, XP002241681WO2003060011-A3  KERRES J ET AL: "Preparation and characterisation of novel basic polysulphone polymers " J. POLYMER SCI. PART A , Bd. 39, Nr. 17, 1. September 2001 (2001-09-01), Seiten 2874-2888, XP002241680;  KERRES J. ET AL: "Development and characterisation of crosslinked ionomer membranes based upon sulfinated and sulphonated PSU" J. MEMBRANE SCIENCE , Bd. 139, 1998, Seiten 227-241, XP002241681;  KERRES J E AL : "New sulfonated engineering polymers etc" J. POLYMERR SCI.PART A , Bd. 36, 1998, Seiten 1441-1448, XP002241682;  KERRES J ET AL: "Preparation and characterisation of novel basic polysulphone polymers", J. POLYMER SCI. PART A, vol. 39, no. 17, 1 September 2001 (2001-09-01), pages 2874 - 2888, XP002241680;  KERRES J. ET AL: "Development and characterisation of crosslinked ionomer membranes based upon sulfinated and sulphonated PSU", J. MEMBRANE SCIENCE, vol. 139, 1998, pages 227 - 241, XP002241681;  KERRES J E AL: "New sulfonated engineering polymers etc", J. POLYMERR SCI.PART A, vol. 36, 1998, pages 1441 - 1448, XP002241682;  KERRES J ET AL: "Preparation and characterisation of novel basic polysulphone polymers", J. POLYMER SCI. PART A, vol. 39, no. 17, 1 September 2001 (2001-09-01), pages 2874 - 2888, XP002241680,relevantClaims[1,17-22],relevantPassages[&lt;figure&gt;4&lt;/figure&gt;|&lt;pp&gt;2888&lt;/pp&gt;];  KERRES J. ET AL: "Development and characterisation of crosslinked ionomer membranes based upon sulfinated and sulphonated PSU", J. MEMBRANE SCIENCE, vol. 139, 1998, pages 227 - 241, XP002241681,relevantClaims[1-22],relevantPassages[&lt;pp&gt;228&lt;/pp&gt;];  KERRES J E AL: "New sulfonated engineering polymers etc", J. POLYMERR SCI.PART A, vol. 36, 1998, pages 1441 - 1448, XP002241682,relevantClaims[1-22],relevantPassages[&lt;pp&gt;1442&lt;/pp&gt;]