Abstract: A composition comprising: (i) a polymeric material (A) having a repeat unit of formula —(O-Ph)n-O-Ph-O-Ph-CO-Ph-??I and a repeat unit of formula —O-Ph-Ph-O-Ph-CO-Ph-??II wherein Ph represents a phenylene moiety and n represents 0 or 1; and (ii) a polymeric additive comprising one or more of: (a) a polycarbonate; and/or (b) a polymeric material (B) which includes a repeat unit of general formula wherein R1 and R2 independently represent a hydrogen atom or an optionally-substituted (preferably un-substituted) alkyl group, and R3 and R4 independently represent a hydrogen atom or an optionally-substituted alkyl group, an anhydride-containing moiety or an alkyloxycarbonyl-containing moiety.

Abstract: A composition comprising titanium dioxide, barium sulphate and/or zinc sulphide and one or more polymeric material selected from: i) a polymeric material (A) having a repeat unit of formula —O-Ph-O-Ph-CO-Ph- I and a repeat unit of formula —O-Ph-Ph-O-Ph-CO-Ph II wherein Ph represents a phenylene moiety; and/or ii) a polymeric material (B) having a repeat unit of formula —X-Ph-(X-Ph-)A-Ph-CO-Ph-III and a repeat unit of formula —X—Y—W-Ph-Z—W wherein Ph represents a phenylene moiety; each X independently represents an oxygen or sulphur atom; n represents an integer of 1 or 2; Y is selected from a phenylene moiety, a -Ph-Ph moiety and a naphthalenyl moiety; W is a carbonyl group, an oxygen or sulphur atom, Z is selected from —X-Ph-SO2-Ph- —X-Ph-SO2—Y—SO2-Ph- and —CO-Ph-.

Abstract: A composition comprising: (i) a polymeric material (A) having a repeat unit of formula (O-Ph)n-O-Ph-O-Ph-CO-Ph- ??I and a repeat unit of formula —O-Ph-Ph-O-Ph-CO-Ph- ??II wherein Ph represents a phenylene moiety and n represents 0 or 1; and (ii) a polymeric additive comprising one or more of. (a) a polycarbonate; and/or (b) a polymeric material (B) which includes a repeat unit of general formula wherein R? and R?? independently represent a hydrogen atom or an optionally-substituted (preferably un-substituted) alkyl group, and R3 and R4 independently represent a hydrogen atom or an optionally-substituted alkyl group, an anhydride-containing moiety or an alkyloxycarbonyl-containing moiety.