Abstract: 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.

Abstract: 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,R.sup.2, R.sup.3 and R.sup.4 each independently is an optionally substituted alkyl radical containing from 1 to 16 carbon atoms,R.sup.5 is hydrogen, an alkyl or aryl radical containing from 1 to 7 carbon atoms, andn=0 or 1,are produced by reacting a base with a 1-halogen-1-phosphonosuccinic acid ester of the formula ##STR2## in which Hal is chlorine or bromine. The esters are useful as intermediates in the synthesis of sequestrants, corrosion inhibitors, stabilizers, flameproofing agents, pharmaceuticals and pesticides.

Abstract: 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:______________________________________ MgO 7-27.5 % CaO 4.5-32.5 % ZnO 3-15 % Al.sub.2 O.sub.3 5-13.5 % SiO.sub.2 36-56 % TiO.sub.2 0- 9 % ______________________________________The fibers are especially suited for use as a reinforcement in a plastic, plaster, cement or low-melting metal structure.

Abstract: 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:______________________________________ ZnO 15 to 23 % SiO.sub.2 43 to 52 % Al.sub.2 O.sub.3 15 to 23 % MgO 7 to 12 % TiO.sub.2 3 to 7 %. ______________________________________The fibers are especially suited for use as a reinforcement in a plastic, plaster, cement or low-melting metal structure.

Abstract: A process for the production of synthetic zeolite with the crystal structure of faujasite and with a composition corresponding to the formula:Na.sub.2 O . Al.sub.2 O.sub.3 . (2.5 .+-. 0.5) SiO.sub.2 . n H.sub.2 O(n = 0 to 8)comprising forming a reaction mixture containing Na.sub.2 O, Al.sub.2 O.sub.3, SiO.sub.2 and H.sub.2 O at a temperature of about 60.degree. to 105.degree. C in the presence of about 1 to 20% of finely divided zeolite A based on the weight of Na.sub.2 O + Al.sub.2 O.sub.3 + SiO.sub.2, thereby to form a precipitate which crystallizes to form a synthetic zeolite of faujasite structure. Advantageously the molar ratios of the oxides in the reaction mixture, exclusive of the added zeolite A, are approximately:SiO.sub.2 /Al.sub.2 O.sub.3 = 3 to 5Na.sub.2 O/SiO.sub.2 = 1.2 to 1.5H.sub.2 O/Na.sub.2 O = 35 to 45.Even if the mass is stirred during crystallization, little or no phillipsite is produced.