Bayer Aktiengesellschaft

Agfa-gevaert Ag

Agfa Gevaert Nv

Alfons Klein

Karlfried Wedemeyer

Rudolf Kron

Helmut Fiege

Fritz Nittel

Ernst Knust

Lothar Havenith

Jurgen Thies

Lothar Puppe

Johannes Sobel

Albert Lucien Poot

Hans-Heinrich Credner

Klaus-Christian Paetz

Jozef Frans Willems

Werner Jeblick

Siegfried Bohm

Jan Frans Van Besauw

Willibald Pelz

Rolf Kron

Walter Schulte

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

4-Methyl-2-cyclohexylphenol can be prepared by alkylation of p-cresol with cyclohexanol or cyclohexene by performing the reaction in the liquid phase in the presence of 1-10% by weight, based on the amount of p-cresol, of a large pore, acidic zeolite.

Preparation of 4-methyl-2-cyclohexylphenol

Alkylated aromatic amines can be isolated from crude catalyst-containing mixtures of these with olefins by a procedure in which in general equivalent amounts of an inorganic base and water are added to the alkylation mixture, the catalyst is hydrolysed, the water present in the reaction mixture after the hydrolysis is removed by distillation and the solid catalyst residue is separated off. The catalyst-free alkylation mixture which remains is then fed to customary further working up.

Process for the isolation of alkylated aromatic amines

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

Compositions containing ditolyl ethers have outstanding dielectric properties. They are particularly suitable for use as impregnating agents in condensers.

Dielectric impregnating fluid and its use

1,1,3,3-substituted hydroxyindanes of the formula ##STR1## wherein R.sup.1 is selected from the group of hydrogen, halogen and optionally substituted alkyl, cycloalkyl, aralkyl and aryl and the group ##STR2## wherein X is sulphur or the group ##STR3## R.sup.2 and R.sup.3 can be the same or different and are selected from the group of hydrogen, halogen and optionally substituted alkyl, cycloalkyl, aralkyl and aryl group, or, if

1,1,3,3-Substituted hydroxyindanes

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

A process for the preparation of a-phenoxy-benzaldehyde which comprises contacting the 3-phenoxy-benzyl alcohol of the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and represent hydrogen or halogen with an aqueous solution of a dichromate in the presence of aqueous sulphuric acid at a temperature in the range of 50.degree. to 125.degree. C. The 3-phenoxy-benzaldehyde can be in a mixture of other organic compounds such as obtained by hydrolyzing a 3-phenoxy toluene chlorinated in the side chain at a temperature of 140.degree.-210.degree. C. under pressure.

Process for the preparation of 3-phenoxy-benzaldehydes

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.

Chloro-diphenyl

A color photographic recording material is provided containing at least one dye image or a color coupler for the production of a dye image and the material contains in at least one hydrophilic layer a hydroxyindane as defined hereinafter to reduce the fading of the image dye on exposure to UV or visible light.

Color photographic material containing a hydroxyindane

1,1,3,3-SUBSTITUTED HYDROXY INDANES HAVING THE FORMULA ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3, which may be the same or different, are selected from the group of hydrogen, halogen and optionally substituted alkyl, cycloalkyl, aralkyl and aryl, in addition to which

Process for the preparation of 1,1,3,3-substituted hydroxy indanes

Thermographic recording material or image-receiving material for dry copying processes comprising at least one layer and a substantially non-photosensitive reducible silver salt, a reducing agent, and optionally a toning agent or toning mixture, wherein the reducing agent corresponds to the following general formula: ##STR1## wherein: EACH OF R.sup.1, R.sup.3 and R.sup.5 (equal or different) represents hydrogen, a straight-chain or branched alkyl group comprising 1 to 9 carbon atoms, or a cycloalkyl group, with the proviso that R.sup.1 and R.sup.5 do not represent hydrogen simultaneously,

Recording materials and image receiving materials for producing copies

In the preparation of 5-isopropyl-3-methyl-phenol from 3-methyl-phenol carrying at least one isopropyl radical or in the presence of propene by heating in the presence of a catalyst, the improvement which comprises effecting said heating at a temperature of about 200.degree. to 400.degree.C in the presence, as a catalyst, of synthetic aluminum silicate which has not been treated with acid. The reaction can involve isopropylation, isomerization and/or transisopropylation.

Process for the preparation of 5-isopropyl-3-methyl-phenol

1,1,3,3-SUBSTITUTED HYDROXYINDANES OF THE FORMULA ##SPC1## Wherein

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Duesseldorf, Germany

Alfons Klein