Patents Assigned to Celanese Corporation
  • Patent number: 5510420
    Abstract: The present invention relates to a novel matrix resin for high-temperature stable photoimageable compositions, in the form of a graft copolymer of monomeric or lower oligomeric hydroxyphenyl units grafted onto a polymer backbone containing reactive sites, to a process for its production and to its use as a matrix resin in photoimageable compositions either in a pure form or in admixture with other polymeric materials.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: April 23, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Ralph R. Dammel, Owen B. Evans
  • Patent number: 5507304
    Abstract: A blend of cellulose acetate and starch acetate used to make fibers, filaments, yarns, fabrics, plastic materials and other uses is disclosed. Additionally, the invention relates to the process of making said blend; cigarette filters made from tow composed of said blend; cigarettes made with filters made from tow of said blend as well as acetate flake and other compositions containing said blend.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: April 16, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Joanne C. Maheras, John B. Hopkins, Jr., Heribert Tetzlaff
  • Patent number: 5508458
    Abstract: A novel catalyst comprising the formula: ##STR1## and which has utility in areas such as epoxidation of olefins.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: April 16, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: Shu-Hai Zhao
  • Patent number: 5508451
    Abstract: A process for preparing a dialkali metal cromoglycate which comprises (1) condensing a hydroxy substituted ketone with a condensing agent in the presence of a base material and an organic solvent; (2) subjecting the condensed material to ring-closure conditions, first in the presence of an alkali metal alkoxide and a suitable organic solvent, then followed by the addition of substantially dry mineral acid and a suitable organic solvent; and (3) hydrolyzing the ring-closed material in the presence of a base material and a suitable organic solvent to form said cromoglycate.
    Type: Grant
    Filed: July 7, 1994
    Date of Patent: April 16, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Apurba Bhattacharya, Boyd A. Keys
  • Patent number: 5505889
    Abstract: A method of melt spinning sheath/core bicomponent fibers including the steps of passing multiple streams of pressurized molten core polymer from distributor flow passages into multiple parallel spinneret flow passages in respective axial or coaxial alignment with said multiple distributor flow passages. In pressured molten sheath polymer is passed through channels positioned in the top surface of the spinneret and surrounding the inlets of the spinneret flow passages. The sheath polymer is directed to flow from the channels into each of the spinneret flow passages and each of the polymer streams at a controlled pressure drop.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: April 9, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: Barrie L. Davies
  • Patent number: 5504120
    Abstract: A process for recycling waste from the manufacture of filtered cigarettes is disclosed herein. The process comprises the following steps: A waste stream from the manufacture of filtered cigarettes is provided. The waste stream includes tobacco, filter tips comprising cellulose ester polymer, and paper. A substantial portion of the filter tips is separated from this waste stream. The filter tips are washed with a sufficient volume of water to liberate bound tipping paper and to remove contaminants from the cellulose ester polymer. Oxidizers may be added to improve tip color and/or serve as a pretreatment. The cellulose ester polymer may then be dried, resolutioned, and processed into useful articles of commerce.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: April 2, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: John B. Hopkins, Jr., Howard T. Bradsher, David O. Kutscher
  • Patent number: 5504119
    Abstract: A process for recycling waste from the manufacture of filtered cigarettes is disclosed herein. The process comprises the following steps: A waste stream from the manufacture of filtered cigarettes is provided. The waste stream includes tobacco, filter tips comprising cellulose ester polymer, and paper. A substantial portion of the filter tips is separated from this waste stream. The filter tips are washed with a sufficient volume of water to liberate bound tipping paper and to remove contaminants from the cellulose ester polymer. The cellulose ester polymer may then be dried, resolutioned, and processed into useful articles of commerce.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: April 2, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: John B. Hopkins, Jr.
  • Patent number: 5502239
    Abstract: A process for recovering dimethyl terephthalate (DMT) comprises the steps of: providing a dimethyl terephthalate stream including dimethyl terephthalate, glycols, and coordination compounds; acidifying the coordination compounds to disassociate the ligands from the metalions; separating the ligands from the metalions; separating the dimethyl terephthalate from the glycols; and recovering the dimethyl terephthalate. Additionally, the process may include the step of basifying the metalions to precipitate the metal; and recovering the metal.
    Type: Grant
    Filed: August 7, 1995
    Date of Patent: March 26, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Brad L. Smith, Gary E. Wilkins
  • Patent number: 5500099
    Abstract: The present invention provides a process for preparing arylglyoxals which comprise the steps of (a) electrochemically oxidizing an arylketone at a pH of less than about seven and at a temperature of from about -20.degree. C. to about 120.degree. C. in the presence of an electrolyte for a sufficient period of time to form an arylacetal, and (b) subjecting said acetal to hydrolysis for a sufficient period of time and under suitable temperature and pressure conditions to form said arylglyoxal.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: March 19, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Ricardo E. Borjas, Carina Araullo-McAdams, Steven R. Alexander, George A. Blay, Yaw-Hwa Liu
  • Patent number: 5498802
    Abstract: A process for preparing 6-chloro-2-hexanone which comprises the steps of (a) dehydrating cyclohexanol in the presence of a suitable catalyst and at a suitable temperature and for a sufficient period of time to form cyclohexene; (b) rearranging said cyclohexene at a higher temperature than in step (a) in the presence of a suitable catalyst and for a sufficient period of time to form 1-methylcyclopentene; (c) hydrating said 1-methylcyclopentene at a temperature lower than step (b) and in the presence of a resin catalyst for a sufficient period of time to form 1-methylcyclopentanol; (d) reacting said 1-methylcylcopentanol with a suitable amount of an alkali metal hypochlorite in the presence of a carboxylic acid to form 1-methylcyclopentyl hypochlorite; and (e) heating said 1-methylcyclopentyl hypochlorite for a sufficient period of time to form 6-chloro-2-hexanone.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: March 12, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Diane E. Allen, Ramakrishnan Chidambaram
  • Patent number: 5498804
    Abstract: The present invention provides a unique and novel way of producing carbinols such as 4-hydroxyphenylmethylcarbinol (HPMC). In this new process, a ketone such as 4-hydroxyacetophenone (4-HAP) is heated under suitable hydrogenation conditions of temperature and pressure in the presence of a suitable catalyst and for a sufficient period of time to form HPMC.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: March 12, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: James R. Sounik, Graham N. Mott, Charles B. Hilton
  • Patent number: 5496647
    Abstract: A polyester film coated with a novel primer coating and overcoated with one or more gelatin-aziridine coatings makes an excellent photographic film as well as for other suitable purposes like reprographic film, x-ray film, etc. The primer coating has about 85-90% by weight of a water-dispersible copolyester and about 1-15% by weight of an anionic surfactant. The water-dispersible copolyester contains about 80-98 mol % of at least one dicarboxylic acid or its ester equivalent; about 1-20 mol % of a sulfomonomer containing a sulfonate group attached to a dicarboxylic nucleus; and about 100 mol % of at least one glycol having 2-11 carbon atoms. The gelatin-aziridine coating contains about 0.5 to 100% by weight of aziridine, based on the weight of the gelatin. The gelatin-aziridine coating is sufficient to provide adhesion to or serve as a photographic gelatin coating and the aziridine being sufficient to bond the gelatin to the primed film.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: March 5, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: James J. Krejci, John M. Heberger
  • Patent number: 5496959
    Abstract: This invention relates to the preparation of N-acyl taurates by the direct condensation of carboxylic acids with taurate (substituted 2-aminoalkane sulfonic acids and their alkali metal salts) derivatives.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: March 5, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: James F. Day
  • Patent number: 5493062
    Abstract: The present invention provides a unique and novel way of producing vinyl phenols such as p-vinyl phenol (4-hydroxystyrene--HSM). In this new process, p-.alpha.-aminoethylphenol (AEP) is heated under suitable deamination conditions of temperature and pressure and for a sufficient period of time to form the 4-hydroxystyrene (HSM).
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: February 20, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: James R. Sounik, William W. Wilkison, III, Keith M. Russ
  • Patent number: 5491265
    Abstract: A process for preparing 6-chloro-2-hexanone which comprises the steps of (a) oxidizing methylcyclopentane with ozone in the presence of a carboxylic acid and for a sufficient period of time to form 1-methylcyclopentanol; (b) reacting said 1-methylcyclopentanol with a suitable amount of an alkali metal hypochlorite in the presence of a carboxylic acid to form 1-methylcyclopentyl hypochlorite; and (c) heating said 1-methylcyclopentyl hypochlorite for a sufficient period of time to form 6-chloro-2-hexanone.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: February 13, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Diane E. Allen, Charles E. Tucker, Charles C. Hobbs, Ramakrishnan Chidambaram
  • Patent number: 5491024
    Abstract: The present invention is directed to a man-made fiber comprising a cellulose ester and 0.05 to 5.0% by weight of a titanium dioxide having an average particle size of less than 100 nanometers.
    Type: Grant
    Filed: March 14, 1995
    Date of Patent: February 13, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Terry A. Brodof, John B. Hopkins, Jr.
  • Patent number: 5489712
    Abstract: The present invention provides a novel process for preparing cyclic ketones, such as indanones, which comprises the steps of (a) subjecting a substituted ketone to suitable methylenation conditions in the presence of a methylene transfer agent and an acylating agent for a sufficient period of time and under suitable conditions of temperature and pressure to form the corresponding alpha, beta unsaturated ketone, and (b) subjecting said unsaturated ketone to suitable cyclization conditions in the presence of a suitable acid or base for a sufficient period of time and under suitable conditions of temperature and pressure to form said cyclic ketones.
    Type: Grant
    Filed: November 4, 1994
    Date of Patent: February 6, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: Apurba Bhattacharya
  • Patent number: 5488111
    Abstract: This invention relates to a compound of the formula: ##STR1##
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: January 30, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: John C. Saukaitis
  • Patent number: 5486971
    Abstract: Flexible sheet-like magnetic discs (so-called 37 floppy discs") are provided with a central hub formed of a magnetically soft polyacetal composition. The polyacetal composition necessarily includes a polyacetal resin and elemental iron particles homogeneously dispersed throughout the polyacetal resin in an amount sufficient to impart the desired soft magnetic properties to the inherently nonmagnetic polyacetal base resin. The polyacetal compositions of this invention are injection-moldable so that central hubs for flexible magnetic discs can be rapidly and economically produced.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: January 23, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: Patrick M. Hughes
  • Patent number: 5486410
    Abstract: A fibrous structure comprising a composite fiber matrix loaded with immobilized functional particulate and including void spaces forming tortuous flow paths, is provided. The particulate is beneficially distributed in the interior of the fibrous structure in three dimensions and fused to a low melting component of the composite fibers without substantially reducing the available surface area of the particulate. A filtration structure of a composite staple having a nylon sheath and a polyester core, with activated carbon particles bonded to the fiber matrix, and including a microfiber web located within the structure, is specifically disclosed.
    Type: Grant
    Filed: May 17, 1994
    Date of Patent: January 23, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: H. Gunter Groeger, George A. Serad, Clinton D. Felton