Claims
- 1. A substantially non-aqueous electrolyte composition for aluminum-anode electrolyte capacitors consisting essentially of ethylene glycol solvent and:
- a reaction product formed at a temperature below about 35.degree. C. in the presence of said ethylene glycol solvent when an amount of fumaric acid is reacted with twice the molar concentration of a base, said base being selected from the group consisting of ammonia, a primary amine of the formula RNH.sub.2, a secondary amine of the formula RR'NH and a tertiary amine of the formula RR'R"N wherein R, R' and R" are selected from a group consisting of C.sub.1 to C.sub.4 alkyl and alkylene groups, with said substantially non-aqueous electrolyte composition being free of unreacted fumaric acid, and
- wherein the total molar concentration of said fumaric acid and said base used to form the reaction product is less than about 0.3 mole per mole of said ethylene glycol and said electrolyte composition having a pH of between about 4.9 to 7.2 to prevent corrosion of the aluminum-anode.
- 2. The electrolyte composition in accordance with claim 1 further including a stabilizing agent selected from the group consisting of a boric acid, phosphoric acid, ammonium dihydrogen phosphate, ammonium pentaborate, ammonium phosphate and mixtures thereof.
- 3. The electrolyte composition in accordance with claim 1 wherein said reaction product is formed from between 0.001 to about 0.1 mole of said fumaric acid per mole of said ethylene glycol.
- 4. The electrolyte composition in accordance with claim 1 wherein said base is triethylamine.
Parent Case Info
This is a continuation of application Ser. No. 12,321 filed Feb. 15, 1979 which is a continuation of application Ser. No. 841,181 filed Oct. 11, 1977, both now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1805383 |
May 1970 |
DEX |
7005567 |
Oct 1970 |
NLX |
Continuations (2)
|
Number |
Date |
Country |
Parent |
12321 |
Feb 1979 |
|
Parent |
841181 |
Oct 1977 |
|