Patents Assigned to BASF Aktiengesellschaft
  • Use of naphthalenesulfonic acid-formaldehyde condensates products as drying aids
    Patent number: 6762221
    Abstract: Naphthalenesulfonic acid-formaldehyde condensates are used as assistants in the drying of aqueous polymer dispersions. Also described is a process for preparing polymer powders by drying, using these condensates; the polymer powders obtainable by the process; and their use as binders.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: July 13, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Joachim Pakusch, Maximilian Angel, Joachim Roser, Andree Dragon, Heinrich Sack
  • Method for producing aqueous polymer dispersions
    Patent number: 6759490
    Abstract: The invention provides a process for preparing an aqueous polymer dispersion of a copolymer CP of at least two different monomers M1 and M2 by free-radical aqueous emulsion polymerization of the monomers M in the presence of at least one initiator, at least 80% of the monomers M and at least 75% of the initiator being supplied continuously to the polymerization reaction during its course, which comprises changing the rate at which the initiator is supplied to the polymerization reaction a number of times, or continuously, during the polymerization reaction. The invention further provides the polymer dispersions obtainable by this process, polymer powders prepared therefrom, and for the use of the dispersions and/or of the polymer powders to prepare pressure sensitive adhesives.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: July 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Matthias Gerst, Gerhard Auchter, Bernhard Schuler
  • Recycling hydroxylamine-containing stripper solutions
    Patent number: 6758946
    Abstract: A process for working up hydroxylamine-containing solutions as obtained in particular in the electronics industry during the cleaning of electronic components is described. According to the invention, the hydroxylamine is stripped from the wastewater with steam. The products obtained are aqueous hydroxylamine and an aqueous solution of the amines. Both product streams can be purified in further process steps to give a saleable product.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: July 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Otto Watzenberger, Heiner Schelling
  • Preparation of tetrahydrogeraniol
    Patent number: 6759561
    Abstract: The present invention relates to a process for the preparation of tetrahydrogeraniol, wherein the product mixtures and distillation residues from linalool, citronellal, citronellol or geraniol/nerol synthesis are fed directly to catalytic hydrogenation.
    Type: Grant
    Filed: December 4, 2002
    Date of Patent: July 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Frank Funke, Till Gerlach, Klaus Ebel, Signe Unverricht, Frank Haese, Kirsten Burkart, Hans-Georg Göbbel
  • Process for the preparation of creatine or creatine monohydrate
    Patent number: 6759553
    Abstract: A process for the preparation of creatine or creatine monohydrate by reaction of sodium or potassium sarcosinate with cyanamide at a temperature from 20 to 150° C. and a pH from 7.0 to 14.0 comprises carrying out the pH adjustment with carbonic acid.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: July 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Knut Kessel, Günter Scherr, Michael Kluge, Norbert Biedermann, Thomas Greindl, Thomas Bogenstätter, Wolfgang Hähnlein
  • Stabilizing agent for hydroxylamine solutions
    Patent number: 6758990
    Abstract: Hydroxylamine solutions stabilized using tri(4-(2,3-dihydroxyphenyl)-4-oxabutyl)amine, tri(4-(2,3-dihydroxyphenyl)-4-keto-3-azabutyl)amine or salts thereof, and methods of stabilizing hydroxylamine solutions using these compounds.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: July 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Markus Weber, Hans-Josef Sterzel, Eckhard Ströfer, Otto Watzenberger
  • Method for producing alkali methylates
    Patent number: 6759560
    Abstract: Alkali metal methoxides are prepared from aqueous alkali metal hydroxide, which may have been admixed with methanol, and methanol in a reaction column having at least 5, preferably from 15 to 30, theoretical plates between the feed point for the aqueous alkali metal hydroxide and the feed point for the methanol. The gaseous methanol/water mixture formed in the reaction is fractionated in a rectification column. In one variant of the invention, the trays chosen for the reaction column configured as a bubble cap tray, valve tray or sieve tray column are trays in which not more than 5%, preferably <1%, of the liquid rains through the respective trays. In another variant of the process of the present invention, the double-wall reaction column has a temperature in the double wall which is from 3 to 10° C.
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: July 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Josef Guth, Holger Friedrich, Hans-Josef Sterzel, Gerd Kaibel, Kirsten Burkart, Elke Hoffmann
  • Reactor comprising a contact tube bundle
    Patent number: 6756023
    Abstract: The invention proposes a reactor (1) having a contact tube bundle (2) through whose space surrounding the contact tubes a heat-exchange medium circuit is passed, with ring lines (3, 4) at both ends of the reactor with jacket apertures (5, 6) for the supply and discharge of a heat-exchange medium by means of a pump via an external heat exchanger, where the heat-exchange medium is fed to the lower ring line (4) and is discharged to the heat exchanger via the upper ring line (3), and with baffle plates (7) which leave a passage cross section alternately in the reactor center and at the reactor edge.
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: June 29, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Corr, Gerhard Olbert
  • Method for producing tert-butyl esters of aliphatic c1-c4-carboxylic acids
    Patent number: 6756506
    Abstract: The tert-butyl ester of an aliphatic C1-C4-carboxylic acid is prepared by reacting the carboxylic acid with isobutene in the liquid phase in the presence of an acidic catalyst by a continuous process in which the reaction is carried out in a reactor divided into a plurality of sections, the carboxylic acid, the isoolefin and the catalyst are fed into the first section of the reactor, the reaction mixture obtained is removed from the last section of the reactor and the ester is isolated therefrom, the reaction temperature in the reactor being controlled so that it is from 10 to 40° C. and is highest in the first section of the reactor. The novel process permits the technically simple, economical and environmentally friendly preparation of tertiary butyl esters of saturated and unsaturated C1-C4-carboxylic acids.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: June 29, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Ruprecht Kroker, Gerhard Nestler, Werner Schmitt, Winfried Schumm
  • Device for drying and thermally treating granulates with an inert gas stream
    Patent number: 6754979
    Abstract: An apparatus (1) is proposed for drying and heat-treating pellets with a stream of inert gas, wherein the apparatus has a cuboid base unit (2) with a feed (3) for the pellets in its upper part and an outlet (4) in its lower part, with a feed (5) on one lateral surface and with an exhaust base (6) on the opposite lateral surface of the cuboid base unit (2) for the stream of inert gas, and also with distribution and retention equipment (7, 8) in the region of the feed (5) and, respectively, of the exhaust (6) for the stream of inert gas, where each of these extends essentially over the entire vertical cross section of the cuboid base unit (2).
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: June 29, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Alfons Ludwig, Ragnhild Pille, Gunter Pipper
  • Method for producing an aqueous dispersion of particles made up of polymerisate and fine inorganic solid material
    Patent number: 6756437
    Abstract: A process for preparing an aqueous dispersion of composite particles composed of addition polymer and finely divided inorganic solid, in which process at least one ethylenically unsaturated monomer is dispersely distributed in aqueous medium and is polymerized by the method of free-radical aqueous emulsion polymerization by means of at least one free-radical polymerization initiator in the presence of at least one dispersely distributed, finely divided inorganic solid and at least one dispersant.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: June 29, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Zhijian Xue, Harm Wiese
  • Preparation of polyoxymethylenes
    Patent number: 6756475
    Abstract: Continuous process for preparing polyoxymethylene homo- or copolymers by bulk polymerization of the monomers in the presence of cationic initiators, and also, if desired, in the presence of regulators, where during the polymerization both the monomers and the polymer are present in molten form and, if desired, the polymer is then deactivated, and the melt is discharged, cooled and pelletized, which comprises discharging, cooling and pelletizing the polymer at an elevated pressure and in the presence of a liquid.
    Type: Grant
    Filed: August 8, 2002
    Date of Patent: June 29, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Marian Mours, Rainer Anderlik, Gitta Egbers, Michael Kirschey, Martin Roos
  • Method for the production of propylene oxide
    Patent number: 6756503
    Abstract: A process for the preparation of propylene oxide in which (i) propene is reacted with hydrogen peroxide in the presence of methanol to give propylene oxide, giving a mixture (Gi) comprising propylene oxide, methanol, water and unreacted hydrogen peroxide, (ii) a mixture (Gii) comprising methanol, water and hydrogen peroxide is separated off from the mixture (Gi), giving a mixture (Ga) comprising propylene oxide, and (iii) water is separated off from the mixture (Gii), giving a mixture (Giii) comprising methanol and methyl formate.
    Type: Grant
    Filed: January 2, 2003
    Date of Patent: June 29, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Joaquim Henrique Teles, Alwin Rehfinger, Peter Bassler, Anne Wenzel, Norbert Rieber, Peter Rudolf
  • Method for the production of highly reactive polyisobutenes
    Patent number: 6753389
    Abstract: Polyisobutene is prepared by cationic polymerization of isobutene and/or isobutene-containing hydrocarbons in the liquid phase in the presence of a complex of BF3 and at least one cocatalyst which is preferably chosen from oxygen-containing compounds, the BF3/cocatalyst complex being produced in situ by adding BF3 and cocatalyst to a reaction stream, wherein BF3 and oxygen-containing cocatalyst are added to the reaction stream via a common binary nozzle comprising an outlet for BF3 and an outlet for the oxygen-containing cocatalyst. The invention also describes a binary nozzle having a centrally arranged outlet for the catalyst.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: June 22, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans Peter Rath, Dieter Hahn, Gerhard Sandrock, Frans van Deyck, Bart Vander Straeten, Eddy De Vree
  • Process for the preparation of aldehydes
    Patent number: 6753450
    Abstract: The invention relates to a process for the preparation of aldehydes in which at least one compound containing a vinyl or vinylidene group is reacted with carbon monoxide and hydrogen in the presence of a source of a metal from sub-group VIII and in the presence of a bidentate diphosphine ligand, where the diphosphine ligand has the general formula I in which A together with the phosphorus atom to which it is bonded, in each case forms a 2-phosphatricyclo[3.3.1.1{3,7}]decyl radical, in which one or more non-adjacent carbon atoms may be replaced by oxygen atoms and which is substituted or unsubstituted, and X is a bridging chain having 1 to 10 carbon atoms, and the molar ratio between the diphosphine ligand and the metal is at least 5. The process gives predominantly n-aldehydes.
    Type: Grant
    Filed: November 7, 2002
    Date of Patent: June 22, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Ahlers, Michael Slany
  • Polyester-polyether block copolymers
    Patent number: 6753402
    Abstract: Polyester-polyether block copolymers can be prepared by catalytic addition of alkylene oxides onto H-functional initiator substances, using polyester alcohols as H-functional initiator substances and multimetal cyanide compounds as catalysts.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: June 22, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Stephan Bauer, Georg Heinrich Grosch, Gerlinde Tischer, Kathrin Harre, Eva Baum, Thomas Ostrowski, Reinhard Lorenz, Regina Pretzsch, Michael Pcolinski, Stefan Dinsch, Inge Rotermund
  • Compositions for producing moldings from finely divided materials
    Patent number: 6753361
    Abstract: The present invention relates to the use of compositions comprising reaction products of low molecular mass dicarboxylic or tricarboxylic acids with ammonia to produce moldings comprising finely divided materials.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: June 22, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Matthias Kroner, Matthias Gerst, Bernd Reck
  • Dithiocarbamate liquid formulations
    Patent number: 6753003
    Abstract: An essentially anhydrous dithiocarbamate liquid formulation comprises: a) 10 to 70% by weight of at least one active ingredient from the class of the dithiocarbamates, b) 10 to 89% by weight of an essentially anhydrous oil phase, c) 1 to 40% by weight of a polyhydroxystearic acid or a derivative thereof and/or an alkyl or alkenyl glycerin ether ethoxylate, d) 0 to 40% by weight of at least one anionic surfactant.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: June 22, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Reiner Kober, Thomas Kröhl, Günter Oetter, Oliver Borzyk, Karl-Friedrich Jäger, Olivier Grosjean, Hans-Michael Fricke, Sergi Vizoso-Sansano, Hans Ziegler
  • Preparation of at least one organic compound by heterogeneously catalyzed partial gas-phase oxidation
    Publication number: 20040116730
    Abstract: Organic compounds are prepared by heterogeneously catalyzed partial gas-phase oxidation of precursor compounds by a process in which a portion of the reaction gas starting mixture is brought from a low initial pressure to a higher final pressure by means of a radial compressor.
    Type: Application
    Filed: September 23, 2003
    Publication date: June 17, 2004
    Applicant: BASF Aktiengesellschaft
    Inventors: Volker Schliephake, Ulrich Hammon, Ernst Lang, Carl-Ludwig Kruger, Jurgen Schroder, Klaus Joachim Muller-Engel
  • Pulverulent formaldehyde-free binder composition and use thereof for thermal curing of substrates
    Publication number: 20040115429
    Abstract: The present invention relates to a pulverulent formaldehyde-free binder composition containing
    Type: Application
    Filed: December 2, 2003
    Publication date: June 17, 2004
    Applicant: BASF Aktiengesellschaft
    Inventors: Kathrin Michl, Matthias Gerst, Matthias Laubender, Iris Rau, Bernd Reck