Patents Assigned to Hoechst
  • Process for preparing perfluoropolyethers
    Patent number: 5468352
    Abstract: Perfluoropolyethers of the formula ##STR1## in which x and y are an integer from 1 to 4, can be obtained by electrolytic decarboxylation of perfluorocarboxylic acid of the formula ##STR2## in which x is an integer from 1 to 4. The electrolytic decarboxylation is carried out in an aqueous electrolyte fluid in the presence of aliphatic nitrile having an alkyl radical of from 1 to 6 carbon atoms.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: November 21, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Jager, Hans Millauer
  • Process for the preparation of substituted 2,3-difluoropyridines
    Patent number: 5468863
    Abstract: The invention relates to a novel process for the preparation of substituted 2,3-difluoropyridines by reaction of substituted 2,3-halopyridines with fluoride salts in the presence of phase transfer catalysts, preferably in polar aprotic solvents, without removing the resulting substituted 2,3-difluoropyridines continuously from the reaction mixture. The substituted 2,3-difluoropyridines which can be prepared according to the invention are, inter alia, starting materials for the preparation of plant protection agents or pharmaceuticals.
    Type: Grant
    Filed: February 18, 1993
    Date of Patent: November 21, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ralf Pfirmann, Theodor Papenfuhs
  • Printing roller with a sleeve of thermally wound fiber-reinforced thermoplastics and a plasma-sprayed coating of copper or copper alloy
    Patent number: 5468568
    Abstract: The printing roller according to the invention comprises a core cylinder and a sleeve of plastic. The sleeve is built up from a tubular base body composed of a fiber-reinforced thermoplastic material and the base body is coated on its outer surface with a layer, produced by plasma-spraying, of copper or a copper alloy.
    Type: Grant
    Filed: April 15, 1994
    Date of Patent: November 21, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Heinrich Kuhn, Frank Herberg, Dieter Jaculi
  • .alpha.-L-Rhamnosidase for obtaining rhamnose, a process for its preparation and its use
    Patent number: 5468625
    Abstract: The invention relates to .alpha.-L-rhamnosidase, which catalyzes the cleavage of the bond between terminal rhamnose and the aglycone of rhamnose-containing glycosides, a process for preparing it by biotechnological means, and its use for preparing L(+)-rhamnose (6-deoxy-L-mannose).
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: November 21, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Johannes Meiwes, Dieter Wullbrandt, Carlo Giani
  • Transparent, non-heat-sealable, oriented, multilayer polyolefin film, process for the production thereof, and the use thereof
    Patent number: 5468527
    Abstract: A transparent, non-heat-sealable, oriented, multilayer polyolefin film is described. It includes a base layer which contains polypropylene, and at least one non-heat-sealable outer layer. The non-heat-sealable outer layer contains from 0.1 to 0.6% by weight of SiO.sub.2, based on the weight of the outer layer, which has been subjected to organic aftertreatment and has a mean particle diameter of from 2 to 6 .mu.m, preferably from 4 to 5 .mu.m. Also described are a process for the production of the multilayer film and the use thereof.
    Type: Grant
    Filed: February 23, 1994
    Date of Patent: November 21, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Herbert Peiffer, Ursula Murschall, Gunter Schloegl
  • Angiotensin II receptor antagonists for the treatment of disturbances in cardiac rhythm
    Patent number: 5468764
    Abstract: Angiotensin II receptor antagonists for the treatment of disturbances in cardiac rhythm.Antagonists for angiotensin II receptors of the AT, subtype can be employed for combating cardiac arrhythmias, using azole derivatives.
    Type: Grant
    Filed: June 29, 1993
    Date of Patent: November 21, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Holger Heitsch, Wolfgang Linz, Adalbert Wagner, Heinz-Werner Kleemann
  • Unsaturated polyurethanes and their use as dispersants for alkyd resins
    Patent number: 5466772
    Abstract: Unsaturated polyurethanes containing from 20 to 80% by weight of polyethylene glycol units, which can be prepared by reactinga) at least one organic polyisocyanate,b) an unsaturated fatty alcohol or its polyalkylene glycol ether, an unsaturated fatty amine or a reaction product of an unsaturated fatty acid and a monoepoxide,c) a compound which contains not only two groups which react with isocyanate groups but also at least one group which is ionic.d) a polyalkylene glycol having a molecular mass of from 750 to 10,000, and if desirede) a compound containing from three to six hydroxyl or amino groups,the ratio of the isocyanate groups in a) to the hydroxyl and amino groups in the remaining components being from 0.7:1 to 1.2:1. These unsaturated polyurethanes are used as dispersants for alkyd resins.
    Type: Grant
    Filed: March 3, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl-Hans Angelmayer, Gerd Walz, Joachim Zoeller
  • Perylene compounds containing sulfonic acid groups process for preparing them and their use
    Patent number: 5466807
    Abstract: Novel perylene compounds based on perylene-3,4,9,10-tetracarboxylic acid monoanhydride monoimides which are substituted by alkylene- or arylenesulfonic acid groups on one or both imide nitrogen atoms, or on corresponding tetracarboxylic acid diimides, or on a halogenation product thereof, have properties which render them accessible, in addition to their use as dispersing agent for pigments of the same class of compound or other categories, also for direct use as pigments and fluorescent dyestuffs as well as polymer-soluble dyestuffs.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: November 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Erwin Dietz, Manfred Urban
  • Process for preparing arylketoamines
    Patent number: 5466873
    Abstract: Arylketoamines are prepared by reacting arylisonitrosoalkanones with hydrogen in the presence of a transition metal catalyst and a liquid carboxylic acid at a temperature of less than about 600.degree. C.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Ahmed M. Tafesh, George Kvakovszky, Charlet R. Lindley
  • Process for preparing fluorobenzonitriles
    Patent number: 5466859
    Abstract: Fluorobenzonitriles and chlorofluorobenzonitriles are prepared in an advantageous manner from the corresponding chlorobenzonitriles and an alkali metal fluoride in a chlorine-fluorine exchange reaction, by catalyzing the reaction with a quaternary ammonium compound comprising at least one alkoxypolyoxyalkyl radical.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Thomas Schach, Theodor Papenfuhs, Ralf Pfirmann
  • 8-sulfo-3-quinoline carboxylic acids and process therefore
    Patent number: 5466808
    Abstract: This invention is a process for preparing 8-sulfo-7-chloro-6-fluoro-4-oxo-1,4-dihydro-3-quinolinic acid wherein the amino analinomethylenomalonate starting material of Formula 1 is unsubstituted at the R.sub.1 and R.sub.2 positions i.e. these moieties are hydrogen. In the ring closing process when R.sub.1 and R.sub.2 are hydrogen, not only does the ring close but the ring position at R.sub.2 is sulfonated.
    Type: Grant
    Filed: August 10, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Celanese Corporation
    Inventor: John C. Saukaitis
  • Mixtures of liquid crystalline copolymers and fluorothermoplastics, and use thereof
    Patent number: 5466738
    Abstract: Mixtures of liquid crystalline copolymers and fluorothermoplastics, and use thereof.Mixtures of A) liquid crystalline copolymers and B) fluorothermoplastics, having a proportion of A) of 45 to 97% by weight and a proportion of B) of 3 to 55% by weight, have an improved notched impact strength. They are therefore particularly suitable for producing molded articles or as a matrix material for composites.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Michael Romer, Andreas Schleicher, Peter Stamprech
  • Polymeric carbonylation catalyst system
    Patent number: 5466874
    Abstract: A carbonylation catalyst useful for the carbonylation of methanol to acetic acid, acetic anhydride or both comprises a polymer support containing pendant pyrrolidone groups which support a rhodium species. Other polymeric supports capable of withstanding carbonylation temperatures of at least 150.degree. C. are disclosed for the carbonylation reaction in which rhodium levels in the reaction medium of greater than 500 ppm are contemplated.
    Type: Grant
    Filed: August 24, 1993
    Date of Patent: November 14, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Mark O. Scates, R. Jay Warner, G. Paull Torrence
  • Reactivation of water-soluble hydroformylation catalysts
    Patent number: 5466644
    Abstract: A process for regenerating a water-soluble hydroformylation catalyst system comprising a coupler rhodium hydrogen-carbonyl complex of rhodium and compounds of the formula ##STR1## wherein Ar.sup.1 and Ar.sup.2 and Ar.sup.3 are individually phenyl or naphthyl, Y.sup.1, Y.sup.2 and Y.sup.3 are individually selected from the group consisting of alkyl and alkoxy of 1 to 4 carbon atoms, halogen, --OH, --CN, --NO.sub.2 and R.sup.1 R.sup.2 N--, R.sup.1 and R.sup.2 are individually alkyl of 1 to 4 carbon atoms, X.sup.1, X.sup.2 and X.sup.3 are individually carboxylate (--COO.sup.-) or sulfonate (--SO.sub.3.sup.-), m.sub.1, m.sub.2 and m.sub.3 are individually integers of 0 to 3, at least one of m.sub.1, m.sub.2 or m.sub.3 being equal to or greater than 1, and n.sub.1, n.sub.2 and n.sub.
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: November 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Werner Konkol, Helmut Bahrmann, Wolfgang A. Herrmann, Christian Kohlpaintner
  • Plasticized polymer moldings made from modified polyvinyl butyrals
    Patent number: 5466751
    Abstract: A plasticized polymer molding that includes a plasticizer and polyvinyl butyral is disclosed. The polyvinyl butyral includes comonomer units carrying sulfonate groups in the main polymer chain of the polyvinyl butyral. The molding is useful as intermediate films in laminated glass sheets.
    Type: Grant
    Filed: July 7, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Matthias Gutweiler, Matthis Kroggel
  • Process for dyeing fur skins with oxidation dyes
    Patent number: 5466263
    Abstract: The invention relates to a process for dyeing fur skins with oxidation dyes following a pretreatment, which comprises pretreating the fur skins with a metal mordant that contains glyoxylic acid.
    Type: Grant
    Filed: July 7, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hubert Herdt, Josef Hurt
  • Process for perparing 4-hydroxyacetophenone oxime
    Patent number: 5466869
    Abstract: A catalytic process for preparing 4-hydroxyacetophenone oxime by reacting 4-hydroxyacetophenone with NH.sub.3 and H.sub.2 O.sub.2 in the liquid phase, in the presence of a catalyst substantially consisting of a titanium-containing molecular sieve such as a highly crystalline substance, containing SiO.sub.2 and having a zeolitic structure.
    Type: Grant
    Filed: October 31, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Kenneth G. Davenport, Roger A. Sheldon, Joel Le Bars, Werner H. Mueller
  • Tetrazole derivatives of bile acids, and their use as lipid level lowering medicaments
    Patent number: 5466815
    Abstract: The invention relates to tetrazole derivatives of bile acids, processes for their preparation, and use of these compounds as medicaments and cholesterol lowering agents.
    Type: Grant
    Filed: May 5, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Alfons Enhsen, Heiner Glombik, Werner Kramer, Gunther Wess
  • Film for high heat-sensitive stencil paper
    Patent number: 5466521
    Abstract: Disclosed is a film for high heat-sensitive stencil paper, comprising a biaxially oriented film having a thickness of 0.5 to 6.0 .mu.m and formed from a polyester composition comprising polybutylene terephthalate and another polyester,a ratio of the polybutylene terephthalate in the whole polyester being 20 to 80 wt %, a maximum value of average heat shrinkage stresses in the machine and transverse directions of the film measured at a film temperature of 60.degree. to 140.degree. C. being more than 300 g/mm.sup.2, and a heat shrinkage of the film by treatment at 100.degree. C. for 3 minutes being not less than 20%.
    Type: Grant
    Filed: March 23, 1994
    Date of Patent: November 14, 1995
    Assignee: Diafoil Hoechst Company, Ltd.
    Inventors: Yoshinori Sato, Megumi Komiyama, Kazuo Endo, Masashi Tate
  • Amorphous monospheric forms of insulin derivatives
    Patent number: 5466666
    Abstract: A process for the production of an amorphous monospheric form of insulin derivatives is described, wherein the insulin derivative is dissolved in an n-propanol/buffer mixture at a pH of 4.5 to 6.5, an n-propanol content of more than 13% relative to water is established and the resulting solution is subsequently diluted with water.
    Type: Grant
    Filed: April 25, 1994
    Date of Patent: November 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Rainer Obermeier, Walter Sabel, Peter Deil, Karl Geisen