(DE19510027-A1)      Sulphonated aromatic polyether-ketones (PEK) of formula(II) are claimed, in which 1-100% of the -O-phenylene-CO- units are substd. with a SO3M gp., with sulphonated and unsulphonated -O-phenylene-CO- gps. in any sequence: -(Ar-O-Ar'-CO-Ar'-O-Ar-CO-Ar"-CO)- (II) Ar, Ar', Ar" = opt. substd. 1,2-, 1,3- or 1,4-phenylene; M = H, NR4+ (with R = H or 1-4C alkyl), or an alkali or alkaline earth metal or Sub-Gp. 8 metal, pref. H, NR4+,Li, Na, K, Ca, Mg, Fe or Pt.    Also claimed are: (i) a process for the prodn. of (II); (ii) a polymeric electrolyte soln. contg. (II); and (iii) film with a thickness of from 5 microns to 1 mm contg. (II).    USE -   Solns. (ii) are used for the prodn. of asymmetrical membranes (e.g. for nano-, ultra- or micro-filtration) and compact films, for obtaining partic. intimate contact between two polymer electrolyte surfaces, and for producing a porous or rough surface after contacting the soln. with a pptn. agent (claimed). Polymers (II) are used for the prodn. of polymeric electrolyte solns. and/or polymer films, and in electrochemical cells, esp. fuel cells or electrolysers (claimed).    ADVANTAGE -   Enables the controllable prodn. of new sulphonated PEK polymers by sulphonation of PEK under mild conditions, including the sulphonation of -O-phenylene-CO- units (-O-Phe-CO- units).    (DE19545643-A1)      Sulphonated aromatic polyether-ketones (PEK) of formula(II) are claimed, in which 1-100% of the -O-phenylene-CO- units are substd. with a SO3M gp., with sulphonated and unsulphonated -O-phenylene-CO- gps. in any sequence -(Ar-O-Ar'-CO-Ar'-O-Ar-CO-Ar"-CO)- (II) Ar, Ar', Ar" = opt. substd. 1,2-, 1,3- or 1,4-phenylene; M = H, NR4+ (with R = H or 1-4C alkyl), or an alkali or alkaline earth metal or Sub-Gp. 8 metal, pref. H, NR4+,Li, Na, K, Ca, Mg, Fe or Pt.    Also claimed are: (i) a process for the prodn. of (II); (ii) a polymeric electrolyte soln. contg. (II); and (iii) film with a thickness of from 5 microns to 1 mm contg. (II).    USE -   Solns. (ii) are used for the prodn. of asymmetrical membranes (e.g. for nano-, ultra- or micro-filtration) and compact films, for obtaining partic. intimate contact between two polymer electrolyte surfaces, and for producing a porous or rough surface after contacting the soln. with a pptn. agent (claimed). Polymers (II) are used for the prodn. of polymeric electrolyte solns. and/or polymer films, and in electrochemical cells, esp. fuel cells or electrolysers (claimed).    ADVANTAGE -   Enables the controllable prodn. of new sulphonated PEK polymers by sulphonation of PEK under mild conditions, including the sulphonation of -O-phenylene-CO- units (-O-Phe-CO- units).    (EP815159-A1)      Sulphonated aromatic polyether-ketones (PEK) of formula(II) are claimed, in which 1-100% of the -O-phenylene-CO- units are substd. with a SO3M gp., with sulphonated and unsulphonated -O-phenylene-CO- gps. in any sequence: -(Ar-O-Ar'-CO-Ar'-O-Ar-CO-Ar"-CO)- (II) Ar, Ar', Ar" = opt. substd. 1,2-, 1,3- or 1,4-phenylene; M = H, NR4+ (with R = H or 1-4C alkyl), or an alkali or alkaline earth metal or Sub-Gp. 8 metal, pref. H, NR4+,Li, Na, K, Ca, Mg, Fe or Pt.    Also claimed are: (i) a process for the prodn. of (II); (ii) a polymeric electrolyte soln. contg. (II); and (iii) film with a thickness of from 5 microns to 1 mm contg. (II).    USE -   Solns. (ii) are used for the prodn. of asymmetrical membranes (e.g. for nano-, ultra- or micro-filtration) and compact films, for obtaining partic. intimate contact between two polymer electrolyte surfaces, and for producing a porous or rough surface after contacting the soln. with a pptn. agent (claimed). Polymers (II) are used for the prodn. of polymeric electrolyte solns. and/or polymer films, and in electrochemical cells, esp. fuel cells or electrolysers (claimed).    ADVANTAGE -   Enables the controllable prodn. of new sulphonated PEK polymers by sulphonation of PEK under mild conditions, including the sulphonation of -O-phenylene-CO- units (-O-Phe-CO- units).    (JP11502245-W)      Sulphonated aromatic polyether-ketones (PEK) of formula(II) are claimed, in which 1-100% of the -O-phenylene-CO- units are substd. with a SO3M gp., with sulphonated and unsulphonated -O-phenylene-CO- gps. in any sequence: -(Ar-O-Ar'-CO-Ar'-O-Ar-CO-Ar"-CO)- (II) Ar, Ar', Ar" = opt. substd. 1,2-, 1,3- or 1,4-phenylene; M = H, NR4+ (with R = H or 1-4C alkyl), or an alkali or alkaline earth metal or Sub-Gp. 8 metal, pref. H, NR4+,Li, Na, K, Ca, Mg, Fe or Pt.    Also claimed are: (i) a process for the prodn. of (II); (ii) a polymeric electrolyte soln. contg. (II); and (iii) film with a thickness of from 5 microns to 1 mm contg. (II).    USE -   Solns. (ii) are used for the prodn. of asymmetrical membranes (e.g. for nano-, ultra- or micro-filtration) and compact films, for obtaining partic. intimate contact between two polymer electrolyte surfaces, and for producing a porous or rough surface after contacting the soln. with a pptn. agent (claimed). Polymers (II) are used for the prodn. of polymeric electrolyte solns. and/or polymer films, and in electrochemical cells, esp. fuel cells or electrolysers (claimed).    ADVANTAGE -   Enables the controllable prodn. of new sulphonated PEK polymers by sulphonation of PEK under mild conditions, including the sulphonation of -O-phenylene-CO- units (-O-Phe-CO- units).