Bayer Aktiengesellschaft

Rudolf Kron

Alfons Klein

Karlfried Wedemeyer

Helmut Fiege

Ernst Knust

Klaus-Christian Paetz

Lothar Havenith

Mixtures consisting essentially of cyclohexylbiphenyls, dicyclohexylbenzenes, phenylbicyclohexyls and tercyclohexyls are outstandingly suitable as heat transfer media. The mixtures can be prepared from biphenyl and cyclohexanol in the presence of bleaching earths and subsequent hydrogenation.

Heat transfer fluid and process for its preparation

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.

Dielectric liquids

Liquid compositions, having dielectric properties, which contain mixtures of ditolylether isomers and alkylbenzenes.

Impregnating agents and the use thereof

A dielectric composition comprising a mixture of monoisopropylated diphenyls and polyisopropylated diphenyls, especially a mixture of 30 to 60 parts by weight of monoisopropylated diphenyls and 70 to 40 parts by weight of polyisopropylated diphenyls, the polyisopropylated diphenyls preferably being made up in turn of 60 to 85 parts by weight of diisopropylated diphenyls, 10 to 35 parts by weight of triisopropylated diphenyls and 0.5 to 5 parts by weight of tetraisopropylated diphenyls, these latter amounts being based upon the total amount of the polyisopropylated diphenyls.

Impregnating agent and its use

An improvement in an electrical device containing a functional liquid wherein the functional liquid is a compound of the formula ##STR1## and the use of such compounds as dielectrics.

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Leverkusen, Germany

Rudolf Kron