Bayer Aktiengesellschaft

Robert Endres

Lothar Puppe

Heinrich Heine

Armand De Montigny

Wilhelm Weber

Manfred Mansmann

Hans-Horst Steinbach

Volker Wilhelm

Dieter Messer

Krystyna Preuss

Heinz Drave

Refrigerating oils useful in refrigerating devices to produce temperatures lower than -86.degree. C. and as low as -130.degree. C. and free from salts, alcohols, halogenated hydrocarbons and halocarbons and having a viscosity below 10 mm.sup.2 /s at -40.degree. C., consisting essentially of mixtures of at least two members selected from the group consisting of hexamethyl disiloxane, octamethyl trisiloxane, linear decamethyl tetrasiloxane, octamethyl cyclotetrasiloxane and decamethyl cyclopentasiloxane.

Siloxane-based refrigerating oil

Polydiorganosiloxane compositions which are stable in storage with exclusion of moisture and which are curable with water or atmospheric air are useful to produce paintable joint sealing compounds and coating composition and the composition is a mixture of .alpha., .omega.-dihydroxy-polydiorganosiloxanes, carboxylic acid amido alkylalkoxy silicon compounds as cross-linking agents, complex titanic acid esters and filler which comprises a precipitated, hydrophobicized chalk whose residual moisture has been removed before contact with the titanic acid esters and cross-linking agents in the mixture.

RTV 1K compositions which are stable in storage in the absence of

Highly pure amidosilanes of the formula ##STR1## wherein R is alkyl having 1 to 18 carbon atoms, cycloalkyl having 5 to 18 carbon atoms, alkenyl having 2 to 18 carbon atoms and aryl having 6 to 18 carbon atoms,

Process for the preparation of amidosilanes

Coated rutile mixed phase pigments comprise a mixed phase rutile pigment having a first coating of an oxide or hydrated oxide of titanium, zirconium, tin or a mixture thereof and a subsequent coating of an oxide or hydroxide of aluminum, and those pigments exhibit an improved tendency against flocculation in lacquers hardened with acid catalysts.

Flocculation-resistant, mixed phase pigments having a rutile structure,

The invention provides a process for the production of zeolite A from kaolin by conversion of the kaolin into meta-kaolin followed by reaction of the meta-kaolin in an aqueous alkaline medium, wherein the conversion of the kaolin into the meta-kaolin is conducted at temperatures of between 700.degree. and 950.degree. C. in the presence of alkaline earth compounds and optionally in the presence of uncolored halides and/or halogens, wherein the process may be conducted under reducing conditions and in the presence of alkali metal compounds.

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Bergisch-Gladbach, Germany

Robert Endres