Abstract: The invention relates to a process for the production of carbonic acid esters of polysaccharides which is characterized in that polysaccharides are reacted with carbonic acid esters.
Type:
Grant
Filed:
September 8, 1992
Date of Patent:
January 16, 1996
Assignee:
Wolff Walsrode Aktiengesellschaft
Inventors:
Klaus Szablikowski, Hans-Josef Buysch, Alexander Klausener
Abstract: The invention relates to a process for the low-waste production of sodium dichromate from the mineral chromite with simultaneous recovery of low-carbon ferrochromium.
Abstract: Process for the continuous fluidized bed agglomeration wherein the granulating liquid together with propellant air is supplied centrally through a three-phase nozzle on the distributor of the fluidized bed, and at the same time, the solid in powder form is fed into the fluidized bed through the annular space or the three-phase nozzle with the air of a current of propellant air, supplied separately and concentrically.
Type:
Grant
Filed:
February 8, 1994
Date of Patent:
January 2, 1996
Assignee:
Bayer Aktiengesellschaft
Inventors:
Hans Uhlemann, Josef Schmoll, Manfred Bucheler
Abstract: Dialkyl carbonates can be prepared by reacting carbon monoxide with alkyl nitrites in a continuous gas phase reaction in the presence of a heterogeneous platinum metal catalyst, the activity of this catalyst being maintained by the addition of small amounts of halogen. The dialkyl carbonates are thus formed with almost quantitative selectivity and no deactivation of the catalyst occurs.
Type:
Grant
Filed:
July 8, 1994
Date of Patent:
December 19, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Konrad Hable, Alexander Klausener, Zoltan Kricsfalussy, Heinz Landscheidt, Erich Wolters, Eberhard Zirngiebl
Abstract: Alkyl-(3-chlorophenyl)-sulphones are particularly advantageously obtained by chlorination of alkylphenylsulphones if alkylphenylsulphones are chlorinated in molten form with elemental chlorine in the presence of iron(III) chloride and optionally iodine and/or sulphur.
Type:
Grant
Filed:
August 10, 1994
Date of Patent:
December 12, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Stefan Antons, Helmut Fiege, Werner Bussmann, Hartmut Richter
Abstract: 2,3-dichloro-nitrobenzene can be prepared by nitration of 1,2-dichlorobenzene using an anhydrous mixture of phosphoric acid, sulphuric acid and nitric acid. The conditions according to the invention displace the ratio of 2,3,-dichloro-nitrobenzene and 3,4-dichloro-nitrobenzene in favor of the 2,3-isomer.
Type:
Grant
Filed:
January 6, 1995
Date of Patent:
December 12, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Karl H. Neumann, Wolfram Kissener, Helmut Fiege
Abstract: A process for the preparation of very pure titanium dioxide by reacting titanium tetrahalides with sulphuric acid, hydrolysis the titanyl sulphate solution obtained and calcining the hydrolysate is disclosed wherein the reaction between titanium tetrahalide and aqueous 20-40% by weight strength sulphuric acid is performed in such a way that crystallisation of titanyl sulphate does not take place, the hydrogen halide is separated, the solution is optionally concentrated and filtered and then the ratio by weight of sulphuric acid to titanium dioxide is adjusted to between 1.7 and 2.0 and the titanium dioxide concentration is adjusted to between 250 and 300 g/l, the solution is hydrolyzed and the resulting titanium oxide hydrate is filtered off and calcined to give Futile or anatase.
Abstract: The invention relates to new 8-vinyl- and 8-ethinylquinolonecarboxylic acids, process for their preparation, and antibacterial agents and feed additives containing them.
Type:
Grant
Filed:
November 1, 1993
Date of Patent:
November 21, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Uwe Petersen, Thomas Himmler, Thomas Schenke, Andreas Krebs, Klaus Grohe, Klaus-Dieter Bremm, Karl G. Metzger, Rainer Endermann, Hans-Joachim Zeiler
Abstract: The present invention relates to a stretched, multilayer, transparent film which is reflection-reduced on at least one side, consists predominantly of polypropylene and is very suitable as window film for envelopes.
Type:
Grant
Filed:
April 8, 1994
Date of Patent:
November 21, 1995
Assignee:
Wolff Walsrode Aktiengesellschaft
Inventors:
Ulrich Reiners, Anton Krallmann, Eberhard Albinus, Jurgen Bohner
Abstract: Aminomethyl-chromans are obtained by alkylation of correspondingly substituted amines or by reductive amination of correspondingly substituted aldehydes. The aminomethyl-chromans can be used as active compounds in medicaments, in particular for the treatment of diseases of the central nervous system.
Type:
Grant
Filed:
March 22, 1994
Date of Patent:
November 21, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Rudolf Schohe-Loop, Hans-Georg Heine, Bodo Junge, Thomas Glaser, Jean M. V. De Vry, Wolfgang Dompert, Henning Sommermeyer
Abstract: The present invention relates to novel thermoplastic, water-insoluble cellulose hydroxyalkyl hydroxycarboxylic acid esters of the general structureCell--O--Rwhere Cell--O is the substituted OH group of a polymeric cellulose unit and R is either a monomeric and/or polymeric hydroxyalkylether hydroxycarboxylic acid ester of the structure X:X=--A--B--in which A is a linear polyether chain:A=(--D--O--).sub.nin which D signifies a linear aliphatic branched or unbranched chain with 2 to 11 C atoms and n is a whole number equal to or greater than 1, and B is a linear polyester chain: ##STR1## in which E signifies a linear aliphatic branched or unbranched chain with 2 to 5 C atoms and m is a whole number equal to or greater than 1, or R is equal to A or B or X and a combination thereof in any ratio, or R is equal to H (hydrogen) according to the degree of substitution per anhydroglucose unit (max. 3) with A, B or X, and a process for their production and use of these cellulose derivatives as biodegradable mouldings.
Type:
Grant
Filed:
May 17, 1994
Date of Patent:
November 14, 1995
Assignee:
Wolff Walsrode Aktiengesellschaft
Inventors:
Jochen Kalbe, Hanns P. Muller, Rainhard Koch, Jurgen Engelhardt, Wolfgang Koch, Klaus Szablikowski, Gunter Weber
Abstract: In the preparation of m-chloroaromatics by isomerizing corresponding o- and/or p-chloroaromatics in the liquid phase over zeolites, the activity of the zeolites remains at a high level for a particularly long time if the process is carried out in the presence of from 1 to 30 mol % of hydrogen, based on the chloroaromatics used.
Type:
Grant
Filed:
April 22, 1994
Date of Patent:
November 14, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Michael Pies, Helmut Fiege, Lothar Puppe, Josef Kasbauer
Abstract: Organic compounds of reduced sulphur content and sulphur-free organic compounds can be prepared from organic mercapto and/or disulphide compounds in a particularly advantageous manner by hydrogenolytic elimination of hydrogen sulphide if the elimination of hydrogen sulphide is carried out in the presence of an organic solvent by means of an aqueous, non-oxidizing, strong acid and elemental iron, aluminium and/or zinc in the presence of catalytic amounts of nickel and/or cobalt.
Type:
Grant
Filed:
June 7, 1994
Date of Patent:
October 31, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Ferdinand Hagedorn, Helmut Fiege, Hans-Joachim Traenckner
Abstract: The new process for dyeing polyamide fibers with acid dyestuffs, in which small amounts of metal salts are added to the dyebath, gives dyeings having improved lightfastness.
Type:
Grant
Filed:
September 8, 1994
Date of Patent:
October 31, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Jurgen Rohr, Martin Riegels, Sylvia Lohmann
Abstract: 1,1,1,4,4,4-Hexafluorobut-2-ene is prepared from chloro-fluorobutanes of the formula (I)CF.sub.3 --CH.sub.2 --CHCl--CX.sub.3 (I)in which the individual radicals X independently of each other represent chlorine and/or fluorine, by reaction with alkali metal fluoride in an aprotic polar solvent.
Type:
Grant
Filed:
February 14, 1994
Date of Patent:
October 31, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Norbert Lui, Albrecht Marhold, Dietmar Bielefeldt
Abstract: Organic carbonates containing at least one aromatic ester group can be obtained in a continuous manner from carbonates containing at least one aliphatic ester group and a phenolic compound in the presence of a transesterification catalyst known per se by carrying out the reaction in at least two stirred containers connected one behind the other in such a way that, in each case, the phenolic compound is metered in liquid form into the first stirred container and the carbonate containing at least one aliphatic ester group is metered in liquid form into one or more of the stirred containers. The carbonate containing at least one aromatic ester group is removed in liquid form from the last stirred container. Volatile reaction products, for example alcohol which has been cleaved out or a dialkyl carbonate are removed in gaseous form from one or more stirred containers.
Type:
Grant
Filed:
January 18, 1994
Date of Patent:
October 31, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Norbert Schon, Johann Rechner, Paul Wagner, Hans-Josef Buysch, Hans-Erich Gasche, Ricarda Leiberich
Abstract: For treatment of disorders of the central nervous system, the cardiovascular system or the intestinal tract, the new substituted basic 2-aminotetralins of the formula ##STR1## in which R.sup.1 represents hydrogen or alkyl,R.sup.2 represents hydrogen, alkyl or acyl, andR.sup.3 represents quinuclidine or a group of the formula--(CH.sub.2).sub.a --R.sup.4, --CH.sub.2 --CH.dbd.CH--(CH.sub.2).sub.b --R.sup.4, --CH.sub.2 --C.tbd.C--(CH.sub.2).sub.b --R.sup.4, ##STR2## wherein a denotes a number from 1 to 10,b denotes a number 0, 1, 2, 3 or 4,c denotes a number 0, 1 or 2,d denotes a number 2 or 3, andX denotes oxygen, sulphur or NR.sup.5,and their salts.
Type:
Grant
Filed:
October 1, 1993
Date of Patent:
October 31, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Rudolf Schohe, Thomas Glaser, Jorg Traber, George S. Allen
Abstract: A process for preparing perfluoroalkoxy(alkylthio)benzenes from perfluorochloroalkoxy(alkylthio)-benzenes by reaction with hydrogen fluoride in the gas phase and in the presence of a catalyst.
Type:
Grant
Filed:
April 26, 1994
Date of Patent:
October 31, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Norbert Lui, Albrecht Marhold, Karl-Rudolf Gassen
Abstract: The anthracene-spiro-pyrrolidines according to the invention are prepared by reacting either anthracene-spiro-furans or unsubstituted anthracene-spiropyrrolidines with appropriately substituted amines or by reacting unsubstituted anthracene derivatives with appropriately substituted methylenepyrrolidines. The substances can be used as active agents in medicaments, in particular for the production of immunomodulating medicaments.
Type:
Grant
Filed:
December 9, 1993
Date of Patent:
October 24, 1995
Assignee:
Bayer Aktiengesellschaft
Inventors:
Eckhard Schwenner, Gaetan Ladouceur, Thomas M. Aune