Patents Assigned to Celanese Corporation
  • Patent number: 5563300
    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 a basic material, and for a sufficient period of time to form HPMC.
    Type: Grant
    Filed: December 7, 1995
    Date of Patent: October 8, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: James R. Sounik, Graham N. Mott, Charles B. Hilton, Mohammad Aslam
  • Patent number: 5560805
    Abstract: A method for bleaching pulp containing pulp from color dyed waste paper, wherein the method comprises bleaching the pulp with a bleaching chemical, especially sodium hydrosulfite, in the presence of a selected ethoxylated amine.
    Type: Grant
    Filed: July 27, 1993
    Date of Patent: October 1, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Glynn A. Hamilton, Paul W. Shepperd, III
  • Patent number: 5558809
    Abstract: The use of additives to produce polymer electrets with improved charge stability. In particular, the invention relates to the use of specific charge control agents used for toners that are blended with various polymers at suitable concentrations to enhance the charge lifetime of the electrets. The charge control agents include a triphenylmethane compound, a polymeric ammonium compound, and arylsulfide compound and azochromium complex.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: September 24, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Werner Groh, Hans-Tobias Macholdt, Baylor D. Gibson, James R. Walden, Clinton D. Felton
  • Patent number: 5554719
    Abstract: A new polyhydroxystyrene having a novolak type structure which is prepared by the process which comprises the step of polymerizing a mixture of carboxylic acid and at least one substituted phenyl carbinol whose formula is: ##STR1## wherein (a) R.sub.1 is selected from the group consisting of H, alkyl C.sub.1 -C.sub.20, substituted and unsubstituted phenyl, and C(O)R.sub.8 (where R.sub.8 is alkyl C.sub.1 -C.sub.20); (b) R.sub.2 is selected from the group consisting of H and alkyl C.sub.1 -C.sub.20 ; and (c) R.sub.3 -R.sub.7 are each independently selected from the group consisting of H, alkyl C.sub.1 -C.sub.20, OR.sub.9 (where R.sub.9 is H, alkyl C.sub.1 -C.sub.20, esters thereof, or substituted and unsubstituted phenyl), halogen, BZT, nitro, or amino, with the proviso that at least one of R.sub.3 -R.sub.7 is OR.sub.9, in the presence of a suitable catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form said polyhydroxystyrene.
    Type: Grant
    Filed: June 16, 1995
    Date of Patent: September 10, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: James R. Sounik
  • Patent number: 5545713
    Abstract: A polyester film coated with a novel primer coating and overcoated with one or more gelatin-aziridine coatings makes an excellent photographic film. 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: February 28, 1995
    Date of Patent: August 13, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: James J. Krejci, John M. Heberger
  • Patent number: 5545506
    Abstract: This invention relates to negative working color proofing sheet constructions which, upon exposure to an actinic radiation source through a screened image, can accurately reproduce said image. The construction is useful as a color proofing film which can be employed to accurately predict the image quality from a lithographic printing process. The image is produced by forming a composite of a receiver sheet, an adhesive layer, a color layer and cover sheet. Upon imagewise exposure, a negative image appears on the receiver base after dry peel apart development.
    Type: Grant
    Filed: June 24, 1992
    Date of Patent: August 13, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Wojciech A. Wilczak, Stephan J. W. Platzer, David L. Siegfried
  • Patent number: 5543263
    Abstract: The present invention provides methods for producing photoresist compositions having a very low level of metal ions, utilizing specially treated ion exchange resins. A method is also provided for producing semiconductor devices using such photoresist compositions.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: August 6, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: M. Dalil Rahman, Dana L. Durham
  • Patent number: 5538776
    Abstract: A thermoplastic tufted carpet made of a primary backing, tufts tufted into the primary backing, a secondary backing and a polyester hot melt adhesive disposed between the primary and secondary backing. Such a carpet can be recycled through processes known to recycle polyester including glycolysis or methanolysis.
    Type: Grant
    Filed: December 7, 1994
    Date of Patent: July 23, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: James A. Corbin, Ian S. Slack
  • Patent number: 5539109
    Abstract: The invention is that of a new triphenodioxazine dye of the formula: ##STR1## wherein: ##STR2## K is independently selected from SO.sub.3 H and COOH; W=a substituted or unsubstituted arylene, alkylene or arylene-alkylene group;Y.sup.1 =Vinyl, .beta.-Sulfatoethyl, .beta.-Thiosulfatoethyl, .beta.-Halogenethyl-group, .beta.-Phosphatoethyl, andX=H.R, R.sub.1 and R.sub.2 are independently selected from hydrogen and substituted or unsubstituted alkyl.T is independently selected from hydrogen, Cl, Br, C.sub.1 to C.sub.6 alkyl, C.sub.1 to C.sub.6 alkoxy, phenyl or phenoxy; andn is selected from 0, 1 or 2.
    Type: Grant
    Filed: July 11, 1995
    Date of Patent: July 23, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Walter Helmling, Uwe Reiher
  • Patent number: 5536874
    Abstract: There is provided a process for preparing an arylacetic acid or arylpropionic acid divative from an arylcarbinol which comprises the step of subjecting said arylcarbinol to suitable carbonylation conditions for a sufficient period of time and under suitable pressure and temperature to form said acid derivative, with the proviso that said carbonylation conditions include conducting the reaction in a two-phase system wherein one phase is an aqueous medium which contains (1) a catalyst which is a water-soluble metal complex consisting essentially of a Group VIII metal and a hydrophilic ligand such as palladium complexed with trisulfonated triphenylphosphine, and (2) optionally an acid, and wherein the second phase comprises said arylcarbinol.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: July 16, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Roger A. Sheldon, Leendert Maat, Georgios Papadogianakis
  • Patent number: 5532362
    Abstract: The present invention is directed to a dioxazine dye which provides brilliant reddish blue dyeings possessing superior fastness properties and high tinctorial strength.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: July 2, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Walter Helmling, David Brunetti, Uwe Reiher
  • Patent number: 5532035
    Abstract: A recyclable thermoplastic tufted fabric made of a partially meltable primary backing and tufts tufted into the primary backing. The tufts are bonded to the backing by partially melting the backing to bond the tufts and applying a secondary backing. Such a carpet can be recycled through processes known to recycle polyester.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: July 2, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: James A. Corbin, Robert D. Johnson, William G. Neely, Ian S. Slack, Barrie L. Davies
  • Patent number: 5529667
    Abstract: In an improved process for recovering ethylene oxide from an aqueous ethylene oxide solution further containing formaldehyde is provided wherein the impure aqueous ethylene oxide solution is introduced into a distillation zone as a feed stream and undergoes distillation therein to form an ethylene oxide product sidestream and an aqueous bottoms product, water is added to the distillation zone to absorb formaldehyde vapor into a liquid phase and combines with the formaldehyde vapor to form an apparent azeotrope, and removing the apparent azeotrope from the column, the improvement is that all or part of the water is a recycled aqueous stream originating from the aqueous bottoms product and introduced to the distillation zone above the feed stream.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: June 25, 1996
    Assignee: Hoechst Celanese Corporation
    Inventor: Freylon B. Coffey
  • Patent number: 5525424
    Abstract: Organic polymer surfaces are modified by contacting such surfaces with a halohydroxy compound and a cationic compound of a volatile acid having a pK.sub.a >2.5. 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: November 4, 1993
    Date of Patent: June 11, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Norman S. Anderson, Albert L. Promislow
  • Patent number: 5523378
    Abstract: The present invention provides a unique and novel way of producing polyhydroxystyrene which comprises the steps of (a) heating 4-hydroxyacetophenone under suitable hydrogenation conditions of temperature and pressure in the presence of a suitable palladium catalyst and a basic material and for a sufficient period of time to form 4-hydroxyphenylmethylcarbinol; (b) heating 4-hydroxyphenylmethylcarbinol under suitable conditions of temperature and pressure and for a sufficient period of time to form said polyhydroxystyrene.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: June 4, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: James R. Sounik, Graham N. Mott, Charles B. Hilton
  • Patent number: 5523156
    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: October 26, 1995
    Date of Patent: June 4, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Norman S. Anderson, Albert J. Promislow
  • Patent number: 5521052
    Abstract: The present invention provides methods for producing water insoluble, aqueous alkali soluble, film forming novolak resins having an extremely low level of metal ions, utilizing treated anion and cation exchange resins. A method is also provided for producing photoresist composition having a very low level of metal ions from such novolak resin and for producing semiconductor devices using such photoresist compositions.
    Type: Grant
    Filed: December 30, 1994
    Date of Patent: May 28, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: M. Dalil Rahman, Daniel P. Aubin, Dinesh N. Khanna, Douglas McKenzie
  • Patent number: 5516406
    Abstract: A method of purifying the oxidate product formed by the liquid phase oxidation of C.sub.4 -C.sub.8 paraffinic hydrocarbons comprises adding a strong acid catalyst to the oxidate product to catalyze the break down of Michael addition products of unsaturated carbonyls and carboxylic acids so that the carbonyls can be distilled off during the initial stages of purification.
    Type: Grant
    Filed: December 15, 1994
    Date of Patent: May 14, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Nicole G. Wallace, Kenneth A. Windhorst
  • Patent number: 5516886
    Abstract: The present invention provides methods for producing top anti-reflective coating compositions having a very low level of metal ions, utilizing specially treated ion exchange resins. A method is also provided for producing semiconductor devices using such top anti-reflective coating compositions.
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: May 14, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: M. Dalil Rahman, Dana L. Durham
  • Patent number: 5512231
    Abstract: A process for preparing cellulose acetate articles such as fibers. The process includes the following steps: Cellulose acetate is dissolved in a solvent to form a solution, the solvent made up of from 5% to 50% by weight of carbon dioxide and from 95% to 50% of a compatible solvent such as acetone. The solvent is above the supercritical conditions of CO.sub.2. The solution is filtrated of insoluble matter and extended to form a fiber or similar article.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: April 30, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Mark C. Thies, Nnamdi E. Aniedobe, George A. Serad