Patent ID: 6315918
Filing Date: 2001-11-13
Classification: H01G,Y02E

Abstract:
A non-aqueous electrolytic solution for capacitor comprising an electrolyte and a non-aqueous solvent containing at least one cyclic carbonic ester of I, [II,] III or mixtures thereof, where ester I has the formula, ##STR12##where R.sup.1 to R.sup.4, which may be the same or different, meet one of the following conditions:(i) at least one of R.sup.1 to R.sup.4 is --CH.sub.2 --O--A, wherein A is R.sup.5, CO--R.sup.5 or CO--O--R.sup.5 where R.sup.5 is an alkyl group or an unsaturated hydrocarbon group, and the remaining R.sup.1 to R.sup.4 is selected from H, alkyl groups or unsaturated hydrocarbon groups;(ii) at least one of R.sup.1 to R.sup.4 is an unsaturated hydrocarbon group and the remaining R.sup.1 to R.sup.4 is selected from H, alkyl groups, aryl groups or unsaturated hydrocarbon groups;(iii) at least one of R.sup.1 to R.sup.4 is an aryl group and the remaining R.sup.1 to R.sup.4 are selected from alkyl groups or aryl groups; andwhere ester III has the formula, ##STR13##where R.sup.8 and R.sup.9, which may be the same or different, are selected from alkyl groups, aryl groups or unsaturated hydrocarbon groups, and at least one of R.sup.8 and R.sup.9 is an aryl group or an unsaturated hydrocarbon group.