Patents Assigned to Hoechst
  • Process for producing tubular parts of high-T.sub.C superconductor material
    Patent number: 5478801
    Abstract: The invention relates to a process for producing cylindrical or round parts of high-T.sub.c superconductor material comprising bismuth, strontium, calcium, copper and oxygen. In this process, a pre-prepared finely-divided oxide mixture with organic additives is first introduced at room temperature into a casting mold. The shaped mixture is then converted into the superconducting shaped part by subsequent thermal treatment.
    Type: Grant
    Filed: June 21, 1994
    Date of Patent: December 26, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Christoph Lang, Iris Kullmer, Joachim Bock
  • Process for preparing crosslinked water absorbent resins
    Patent number: 5478894
    Abstract: This invention is directed to a recurring polymeric moiety of the following formula: ##STR1## wherein R is independently selected from hydrogen and C.sub.1 to C.sub.4 alkyl; Y is independently selected from O and NH; and X is independently selected from Cl, F, Br, I, NO.sub.3, HSO.sub.4 and H.sub.2 PO.sub.4.Polymers of the above structure may be crosslinked by treating the polymer with a base and heating it.
    Type: Grant
    Filed: July 2, 1993
    Date of Patent: December 26, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: William G. Chiang, Joy L. McCrickard
  • Process for preparing highly pure enantiomers of oxirane alcohols
    Patent number: 5478954
    Abstract: Process for preparing highly pure enantiomers of oxirane alcohols, which comprises recrystallizing a mixture of the isomeric oxirane alcohols, in which the desired enantiomer is present in an excess of at least 60% ee, in a solvent or solvent mixture at a temperature just below the melting point of the oxirane alcohol.Oxirane alcohols prepared according to the invention are distinguished by high enantiomer purity. Ferroelectric liquid crystals, which contain highly pure enantiomers of oxirane alcohols according to the invention and/or derivatives derived therefrom, have particularly short switching times.
    Type: Grant
    Filed: July 28, 1993
    Date of Patent: December 26, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Javier Manero
  • Laminated polyester film
    Patent number: 5478644
    Abstract: A laminated polyester film comprising a polyester film and a layer comprising an antistatic agent and formed on at least one side of the polyester film, the antistatic agent being a high-molecular-weight antistatic agent having a nitrogen atom-containing group and a sulfonic acid or sulfonate group.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: December 26, 1995
    Assignee: Diafoil Hoechst Company, Limited
    Inventor: Jun Takahashi
  • 2,3-difluoro-6-nitrobenzonitrile and 2-chloro-5,6-difluorobenzonitrile-(2,3-difluoro-6-chlorobenzonitrile), process for their preparation and their use for the preparation of 2,3,6-trifluorobenzoic acid
    Patent number: 5478963
    Abstract: The present invention describes the novel intermediates 2,3-difluoro-6-nitrobenzonitrile and 2-chloro-5,6-difluorobenzonitrile, a process for their preparation and their advantageous use for the preparation of 2,3,6-trifluorobenzoic acid, which in turn is a valuable intermediate for the preparation of insecticides and antibacterial agents. The intermediates according to the invention are prepared from 2,3,4-trifluoronitrobenzene by fluorine/cyanide exchange and subsequent denitrating chlorination. 2,3,6-Trifluorobenzoic acid can be prepared from the novel intermediates, in a manner known per se in the literature, by simple chlorine/fluorine exchange and subsequent hydrolysis in a process which overall is industrially advantageous and economically favorable.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: December 26, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ralf Pfirmann, Theodor Papenfuhs
  • Polyester raw material, and film produced therefrom
    Patent number: 5478632
    Abstract: The invention describes a novel polyester raw material and the production and use of an oriented, single- or multilayer film having an overall thickness of .ltoreq.4 .mu.m and a roughness on at least one film surface of R.sub.a <30 nm, where the surface gas-flow resistance on at least one film surface ist.ltoreq.a.multidot.d.sup.b [sec],where a=0 to 10,000 [sec/.mu.m], b=3.0 to 0, and d (overall film thickness).ltoreq.4 .mu.m. The film contains first (I) and second (II) particles. The first particles are monodisperse and have an aspect ratio of 1.0-1.2.
    Type: Grant
    Filed: April 15, 1994
    Date of Patent: December 26, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Rainer Kurz, Andreas Ferdinand, Hermann Dallmann
  • Process for preparing fluoronitrobenzenes
    Patent number: 5476976
    Abstract: Fluoronitrobenzenes are prepared in an advantageous way from the corresponding chloronitrobenzenes and an alkali metal fluoride by means of a chlorine-fluorine exchange reaction with replacement of a chlorine atom by a fluorine atom, by catalyzing the reaction with a quaternaryammonium compound which comprises at least one alkoxypolyoxyalkyl radical.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: December 19, 1995
    Assignee: Hoechst AG
    Inventors: Thomas Schach, Theodor Papenfuhs
  • Preparation of 5-acetoacetylamino-2-benzimidazolone
    Patent number: 5476948
    Abstract: A process for preparing 5-acetoacetylamino-2-benzimidazolone by continuous reaction of 5-amino-2-benzimidazolone with diketene comprises carrying out the reaction in the presence of a water-soluble (C.sub.1 -C.sub.4)-alcohol or of a mixture of this alcohol with water at the boiling temperature.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: December 19, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl E. Mack, Michael Bohusch
  • Amino-substituted benzenesulfonylureas and -thioureas and their use as pharmaceuticals
    Patent number: 5476850
    Abstract: There are described amino-substituted benzenesulfonylureas and -thioureas of the formula I ##STR1## The compounds I are used for the treatment of cardiac arrhythmias and for the prevention of sudden heart death caused by arrhythmias and can therefore be used as antiarrhythmics. They are particularly suitable for those cases in which arrhythmias are a result of constriction of a coronary vessel, such as in angina pectoris or in acute cardiac infarct.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: December 19, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Heinrich Englert, Dieter Mania, Jens Hartung, Heinz Gogelein, Joachim Kaiser
  • Supported catalyst, process for its preparation and its use for the preparation of vinyl acetate
    Patent number: 5476963
    Abstract: Supported catalyst, process for its preparation and its use for the preparation of vinyl acetateThe invention relates to improved Pd/K/Au, Pd/K/Ba and Pd/K/Cd supported catalysts, their preparation and their use for the preparation of vinyl acetate from ethylene, acetic acid and oxygen in the gas phase. The stated catalysts are prepared by atomizing a solution of corresponding metal salts by means of ultrasonics and then applying them in such limited amounts and within such a limited time to the carrier particles, and beginning to dry them, so that the catalytically active metal salts cannot penetrate into the carrier particles as far as the core but only into a larger or smaller outer part.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: December 19, 1995
    Assignee: Hoechst AG
    Inventors: Peter Wirtz, Friedrich Wunder, Karl-Fred Worner
  • Metal ion reduction in the raw materials and using a Lewis base to control molecular weight of novolak resin to be used in positive photoresists
    Patent number: 5476750
    Abstract: The present invention provides methods for producing water insoluble, aqueous alkali soluble novolak resins having a very low level of metal ions and a substantially consistent molecular weight. A method is also provided for producing photoresist composition from such novolak resins and for producing semiconductor devices using such photoresist compositions.
    Type: Grant
    Filed: December 29, 1992
    Date of Patent: December 19, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: M. Dalil Rahman, Ping-Hung Lu, Daniel P. Aubin, Ralph R. Dammel, Dana L. Durham
  • Process for obtaining 3,7-dialkylxanthines from 3-alkyl-xanthines
    Patent number: 5475107
    Abstract: Process for obtaining 3,7-dialkylxanthines from 3-alkyl-xanthines3,7-Dialkylxanthines are obtained from the corresponding 3-alkylxanthines using an alkylating agent in the presence of quaternary ammonium and/or phosphonium compounds and, where appropriate, of additional polyethers in a two-phase mixture.
    Type: Grant
    Filed: November 9, 1993
    Date of Patent: December 12, 1995
    Assignee: Hoechst-Roussel Pharmaceuticals Incorporated
    Inventors: Gerhard Korb, Hans-Wolfram Flemming
  • Process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropane
    Patent number: 5475169
    Abstract: Process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropaneThe invention relates to a process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropane (R 227) in which the contaminated R 227 is brought into contact with an alcohol and a base, and the R 227 is simultaneously or subsequently removed by distillation.
    Type: Grant
    Filed: May 7, 1992
    Date of Patent: December 12, 1995
    Assignee: Hoechst AG
    Inventors: Peter Hopp, Rolf-Michael Jansen
  • Reaction products of dialkyltin oxide and polyhydric phenols
    Patent number: 5475122
    Abstract: These reaction products are suitable as catalysts with improved properties for curing coating binders.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: December 12, 1995
    Assignee: Hoechst AG
    Inventors: Michael Hoenel, Peter Ziegler, Susanne Wehner, Klaus Kueper, Achim Voelker
  • Electrochemical process for preparing glyoxylic acid
    Patent number: 5474658
    Abstract: The present invention describes a process for preparing glyoxylic acid by electrochemical reduction of oxalic acid in aqueous solution in divided or undivided electrolytic cells, wherein the cathode comprises carbon or at least 50% by weight of at least one of the metals Cu, Ti, Zr, V, Nb, Ta, Fe, Co, Ni, Zn, Al, Sn and Cr and the aqueous electrolysis solution in the undivided cells or in the cathode compartment of the divided cells in addition contains at least one salt of metals having a hydrogen overpotential of at least 0.25 V, based on a current density of 2500 A/m.sup.2. The process according to the invention has the advantage that inexpensive materials available on an industrial scale, in particular stainless chromium-nickel steels or graphite can be employed as the cathode material.
    Type: Grant
    Filed: October 24, 1994
    Date of Patent: December 12, 1995
    Assignee: Hoechst AG
    Inventors: Bernd Scharbert, Steffen Dapperheld, Pierre Babusiaux
  • Process for the preparation of alcohols in two stages
    Patent number: 5475161
    Abstract: A process for the preparation of alcohols by reaction of organic carbonyl compounds with hydrogen in two stages at elevated temperature and, optionally, elevated pressure. In the first stage, hydrogen and the carbonyl compounds are fed as a gas to a copper-containing catalyst and reacted to 80 to 99.5 percent of the theoretical conversion. In the second stage, the reaction product of the first stage is fed to a nickel/alumina/zirconium dioxide catalyst as a liquid, along with hydrogen. The carbonyl compounds used include aldehydes and their derivatives and, in particular, aliphatic unsaturated and saturated aldehydes.
    Type: Grant
    Filed: January 17, 1992
    Date of Patent: December 12, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhardt Horn, Carl D. Frohning, Hans Liebern, Wolfgang Zgorzelski
  • Production of highly birefringent film
    Patent number: 5474730
    Abstract: A thin, biaxially oriented polyester film which is asymetrically oriented by stretching 1-2 times in the machine direction and about 3-5 times in the transverse direction in the plane of the film is disclosed. The film has a birefringence of at least 0.085, an optical retardation of at least 9000 nanometers and a shrinkage of less than 2% in any direction at 150.degree. C. The film produced is substantially free of color fringes when viewed in partially polarized light. There are also disclosed two processes for the production of said film.
    Type: Grant
    Filed: June 9, 1993
    Date of Patent: December 12, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Stephen J. Gust, Gregory W. Farell, Marshall D. Ledbetter
  • Use of 1-(5-oxohexyl)-3-methyl-7-n-propylxanthine in vascular surgery
    Patent number: 5475002
    Abstract: The use of 1-(5-oxohexyl)-3-methyl-7-n-propylxanthine or of physiologically tolerated salts of this compound for the preparation of pharmaceuticals for the prophylaxis and treatment of nerve damage after interruption of the blood circulation is disclosed.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: December 12, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Viera Danielisova, Ralf Kolvenbach, Hans-Peter Schubert, John Grome, Ernst J. Schneider
  • Cycloolefin block copolymers and a process for their preparation
    Patent number: 5475060
    Abstract: Cycloolefin block copolymers and a process for their preparation Cycloolefin block copolymers, which in particular are suitable as phase promoters, are preferably obtained by copolymerization of polycyclic olefins, such as norbornene, with acyclic olefins, such as ethylene, by, at a molecular weight distribution M.sub.w /M.sub.n of the polymer block forming of less than 2, changing the reaction conditions one or more times in such a way that the monomer/comonomer ratio changes by at least 10% or a further polymerizable monomer is metered into the monomer or the monomers.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: December 12, 1995
    Assignee: Hoechst AG
    Inventors: Michael-Joachim Brekner, Frank Osan, Jurgen Rohrmann
  • Image-forming transfer material including a polyester film
    Patent number: 5474844
    Abstract: A polyester film for an image-forming transfer material, wherein a difference .DELTA..alpha..sub.t between the maximum coefficient of thermal expansion and the minimum coefficient of thermal expansion in the film plane is not larger than 1.0.times.10.sup.-5 /.degree.C., and the maximum coefficient of thermal expansion .alpha..sub.tmax is not larger than 2.5.times.10.sup.-5 /.degree.C., which can form a high quality color image having less deviation and a high image density.
    Type: Grant
    Filed: July 26, 1994
    Date of Patent: December 12, 1995
    Assignees: Diafoil Hoechst Company, Limited, Mitsubishi Chemical Corporation
    Inventors: Yoshinori Sato, Tetsuya Masuda