Patents Assigned to Celanese Corporation
  • Patent number: 5484459
    Abstract: This invention is directed to a dioxazine fiber reactive dye composition which provides brilliant blue shades comparable to those obtained with dyes of the anthraquinone series.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: January 16, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: Walter Helmling
  • Patent number: 5484455
    Abstract: A process for dyeing cationic polyamide with a vinyl sulfone dye wherein said vinyl sulfone dyed polyamide is color stable. The vinyl sulfone dyed cationic polyamide may be overdyed with acid without staining the dyed cationic nylon.
    Type: Grant
    Filed: May 26, 1994
    Date of Patent: January 16, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: Larry C. Kelley
  • Patent number: 5483010
    Abstract: Organic polymer surfaces are modified by contacting such surfaces with a haloester compound and a cationic compound of having a pK.sub.a >5. Preferably the organic polymer is selected from the group consisting of polyesters, aromatic polyamides, and graphitic polymers and the contacting is conducted at an elevated temperature.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: January 9, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Norman S. Anderson, Albert L. Promislow
  • Patent number: 5482987
    Abstract: A self-lubricating composition containing at least about 70 to about 99.5 weight percent of a thermoplastic polymer and from about 30 to about 0.5 weight percent of a lubricating system, wherein the lubrication system contains high and low molecular weight polyethylenes, polyethylene waxes, metal salts, antioxidants and stabilizers. The composition is suitable for the fabrication of shaped articles, e.g., gears, pulleys, rollers and bearings, which exhibit improved friction and surface wear properties.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: January 9, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: Alex Forschirm
  • 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
  • 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
  • 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
  • Patent number: 5472658
    Abstract: The tensile modulus of fibers made from liquid crystalline polymers comprising 6-oxy-2-naphthoate and 4-oxybenzoate monomer units that have been heat treated can be increased by applying and then releasing a stress at room temperature in the range of about 25% to about 90% of the tensile strength of the heat treated fiber to yield a "pre-stressed" fiber.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: December 5, 1995
    Assignee: Holechst Celanese Corporation
    Inventors: George Collins, William M. Pleban, Frank Haimbach, IV, John A. Flint
  • 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
  • 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
  • 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
  • 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
  • Patent number: 5464923
    Abstract: The present invention provides novel substituted biphenyl pyrazines or pyrazine derivatives ("BPD") which are functional and have useful application as a monomer for a variety of high performance polymers such as polyester, polyarylate, polycarbonate, polyetherketones, epoxides, polyimides, polyamides, and polyamides-imides; and as pigments for coating compositions such as paints. These BPD have the general formula: ##STR1## wherein R.sub.1 -R.sub.8 and n are defined herein.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: November 7, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Richard Vicari, George Kvakovszky, Olan S. Fruchey
  • Patent number: 5464941
    Abstract: The present invention provides novel substituted biphenyl pyrazines or pyrazine derivatives ("BPD") which are functional and have useful application as a monomer for a variety of high performance polymers such as polyester, polyarylate, polycarbonate, polyetherketones, epoxides, polyimides, polyamides, and polyamides-imides; and as pigments for coating compositions such as paints.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: November 7, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Richard Vicari, George Kvakovszky, Olan S. Fruchey, Hans J. Metz
  • Patent number: 5463094
    Abstract: A process for a high temperature, solvent free quaternization of certain tertiary amines using dimethylsulfate to produce quaternary ammonium methyl sulfates which may be used in fabric softening and other applications, is disclosed.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: October 31, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: David M. Brown, Erich M. Gatter, Cheryl A. Littau
  • Patent number: 5462072
    Abstract: The instant invention is directd to the removal of nicotine from tobacco smoke by the use of compounds containing a metal with a valence of +2.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: October 31, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Colin L. Browne, Raymond M. Robertson
  • Patent number: 5463108
    Abstract: The present invention provides a unique and novel way of producing 4-acetoxystyrene. In this new process, 4-hydroxystyrene is acetylated, in the presence of an acetylation agent, under suitable conditions of temperature and pressure and for a sufficient period of time to form acetoxystyrene.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: October 31, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: James R. Sounik, William W. Wilkison, III, Keith M. Russ, Lynn Massarelli
  • Patent number: 5462840
    Abstract: A compound, method of manufacture and method for use of an alternating copolymer having the structure ##STR1## wherein X is independently H, C.sub.1 to C.sub.10 alkyl or alkoxy, primary or secondary amino or halogen, and R is aliphatic, cycloaliphatic, or aliphatic heterocyclic, and wherein the molecular weight ranges from about 1,000 to 50,000.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: October 31, 1995
    Assignee: Hoechst Celanese Corporation
    Inventor: Richard Vicari
  • Patent number: 5462973
    Abstract: A method for separating co-mingled polymeric materials, in particular polyethylene terephthalate (PET) and polyvinyl chloride (PVC) is described. The process involves selectively dissolving a supercritical fluid into one of the materials at the appropriate temperature and pressure. Upon rapid reduction of the system pressure, the selected material foams providing a change in density. Under ambient conditions, the polymeric materials having a large density difference can be separated by means of aqueous separation and flotation. The preferred supercritical fluid for the process is carbon dioxide, and PVC is the material into which the supercritical fluid is preferentially dissolved.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: October 31, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: George A. Serad, Theodore S. Thornburg
  • Patent number: 5458956
    Abstract: A tent fabric constructed substantially of woven polyethylenenaphthalatebibenzoate (PENBB) yarns. The PENBB yarns of the fabric exhibit very low tenacity loss resulting from UV degradation, and exhibit very good dimensional stability, very low hot air shrinkage and very low creep. A flame retardant polymer may be added to the PENBB polymer before extrusion to provide flame resistance.
    Type: Grant
    Filed: October 12, 1993
    Date of Patent: October 17, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Lie Shi, Dee A. Ling, Michelle C. Carter