Patent ID: 7354531

Claim:
A composition for use as a polymer electrolyte comprising one or more polar materials and one or more polyesters of formula III, wherein y is from 1.5 to 80 and each unit A may be identical or different and is of the structure IV, wherein x is from 1 to 5 and each unit B may be identical or different and is of the structure V, wherein R and R 1 are each, independently, hydrogen, optionally substituted hydrocarbyl or an inert functional group, wherein the one or more polar materials are present in the composition in an amount of from 6 to 50 wt. % of the composition and the one or more polyesters of formula (III) are present in the composition in an amount of from 50 to 99 wt.%; and wherein at least one of the one or more polar materials is a salt or a proton conductor system, where the salt is selected from the group consisting of quaternary ammonium salts, ammonium thiocyanate salts, and triflate, perchlorate, bromide, chloride, iodide, bis(trifluoromethylsulphonyl)imide, tetrafluoroborate, trifluoromethanesulphonate, hexafluoroarsenate (V), thiocyanate, acetate, dichlorosulphonimide, fluorochlorosulphonimide, sulphonate and tetrachloroaluminate salts of lithium, sodium, potassium, nickel, zinc, silver, and lanthanides, and where the proton conductor system is selected from phosphoric acid or sulphamide; and wherein the composition is amorphous.