Bayer Aktiengesellschaft

Friedrich Schwochow

Wolfgang Schartau

Hans-Dieter Block

Lothar Puppe

Reinhard Schliebs

Gunter Ulisch

Bismuth vanadate pigment in the form of the tetragonal crystal structure of Scheelite useful in coloring lacquers and synthetic plastics or resins containing 0.1 to 0.3 mol ZrO.sub.2 (per mol of BiVO.sub.4) is prepared by heat treating mixed precipitates of aqueous solutions of bismuth, vanadate and zirconium salts, followed by washing, drying and grinding to pigment fineness.

Bismuth vanadate pigments, a process for their preparation and their use

Novel phosphonomaleic acid esters of the formula ##STR1## in which R.sup.1 is an optionally substituted alkyl radical containing from 1 to 6 carbon atoms and, where n=0, may also be an optionally substituted aryl radical,

Process for producing phosphonomaleic acid esters

Glass fibers of superior physical properties are produced by drawing at a temperature between about 1200.degree. and 1300.degree. C a melt consisting essentially of MgO-CaO-ZnO-Al.sub.2 O.sub.3 -SiO.sub.2 -TiO.sub.2 of the following approximate molar composition:

Reinforcing glass fibers of MgO-CaO-ZnO-Al.sub.2 O.sub.3 -SiO.sub.2

Glass fibers of superior physical properties are produced by drawing at a temperature between about 1250.degree. and 1350.degree. C a melt consisting essentially ZnO-MgO-Al.sub.2 O.sub.3 -SiO.sub.2 -TiO.sub.2 of the following approximate composition by weight:

Reinforcing glass fibers of ZnO-MgO-Al.sub.2 O.sub.3 -SiO.sub.2

A process for the production of synthetic zeolite with the crystal structure of faujasite and with a composition corresponding to the formula:

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Leverkusen, Germany

Friedrich Schwochow