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US 4,912,596 AGranted
Dielectric liquids
AssigneeBayer Aktiengesellschaft
InventorsRudolf Kron, Alfons Klein, Helmut Fiege
Life of this patent
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Abstract
The invention relates to the use of certain aromatic compounds of the formula ##STR1## in which R', R" and X have the meaning given in the description, as dielectric liquids for high-energy voltage-storage capacitors, and to dielectric liquids containing these aromatic compounds, for these high-power capacitors.
Claims8
A high-energy voltage-storage capacitor comprising a liquid dielectric wherein the liquid dielectric is a compound of the formula ##STR6## in which R' and R", independently of one another, are H or C.sub.1 -C.sub.3 -alkyl, and
- X is a phenoxy group of the formula ##STR7## in which R.sub.1 is an electron-withdrawing substituent, and
- R.sub.2 is H or C.sub.1 -C.sub.3 -alkyl, or X is an acyl group of the formulae
- R.sub.3 --SO.sub.2 -- or R.sub.4 --CO--
- in which
- R.sub.3 is a C.sub.2 -C.sub.4 -alkyl radical, and
- R.sup.4 is C.sub.1 -C.sub.6 -alkyl or phenyl, with the proviso that R' and R" are not simultaneously H is X is an R.sub.4 --CO group.
3 more elements
A liquid dielectric composition comprising
- (a) an aromatic compound of the formula ##STR8## in which R' and R", independently of one another, are H or C.sub.1 -C.sub.3 -alkyl, and
- X is a phenoxy group of the formula ##STR9## in which R.sub.1 is an electron-withdrawing substituent and
- R.sub.2 is H or C.sub.1 -C.sub.3 -alkyl, or X is an acyl group of the formulae
- R.sub.3 --SO.sub.2 -- or R.sub.4 --CO--
- in which
- R.sub.3 is a C.sub.2 -C.sub.4 -alkyl radical, and
- R.sub.4 is C.sub.1 -C.sub.6 -alkyl or phenyl
- with the proviso that R' and R" are not simultaneously H when X is an R.sub.4 --CO group, and
- (b) a stabilizer customarily used in liquid dielectrics.
6 more elements
Dependencies are inferred from the claim text.