Patents Assigned to Elf Atochem
  • Aqueous stable dispersions based on water-soluble polymers containing a cationic dispersant comprising hydrophobic units
    Patent number: 6225395
    Abstract: Water-in-water dispersions based on water-soluble polymers can be prepared using a polymer dispersant containing hydrophobic units. The dispersions of the invention are stable on storage and are of low viscosity.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: May 1, 2001
    Assignee: Elf Atochem, S.A.
    Inventors: Denis Tembou Nzudie, Christian Collette
  • Aqueous saline dispersions of water-soluble polymers containing an amphiphilic dispersant based on a cationic polymer containing hydrophobic units
    Patent number: 6221957
    Abstract: The invention relates to aqueous saline dispersions containing a water-soluble polymer and a dispersant based on a polymer, preferably a cationic polymer, containing hydrophobic units.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: April 24, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Denis Tembou Nzudie, Christian Collette
  • Adhesive compositions based on ethylene-unsaturated acid ester copolymers and containing hydroxyl functional groups
    Patent number: 6218471
    Abstract: The present invention relates to crosslinkable hot-melt adhesive compositions in the form of prepolymer containing free isocyanate functional groups; the said prepolymer results from the reaction of a polyisocyanate and of a copolymer (A) of ethylene and of at least one unsaturated carboxylic acid ester and containing hydroxyl functional groups. These adhesives are crosslinked by the ambient moisture.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: April 17, 2001
    Assignee: Elf Atochem S. A.
    Inventors: Jean-Yves Chenard, Jean Lebez, Jean-Michel Pierrot
  • Peroxidic compositions
    Patent number: 6207776
    Abstract: Compositions for curing polymers comprising one or more organic peroxides and trans-stilbene.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: March 27, 2001
    Assignee: Elf Atochem Italia S.r.l.
    Inventors: Luciano Abrigo, Carla Beretta, Ezio Montessoro, Michele Merenda
  • Method for shutting down an electrolysis cell with a membrane and an oxygen-reducing cathode
    Patent number: 6203687
    Abstract: The invention relates to a method for shutting down an electrolysis cell with a membrane and an oxygen-reducing cathode, which comprises, after the electrical power and oxygen supplies have been disconnected, in emptying the oxygen compartment and filling it with demineralized water having a pH≦7 and in keeping this water in the oxygen compartment throughout the shutdown period.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: March 20, 2001
    Assignee: Elf Atochem, S.A.
    Inventor: Francoise Andolfatto
  • Flexible, polyamide-based compositions suitable for extrusion blow moulding
    Patent number: 6203920
    Abstract: The invention relates to compositions comprising a matrix of an alloy of (a) polyamide and (b) polymer having polyamide blocks and polyether blocks, dispersed in which matrix is a crosslinked phase (c), the said compositions having a melt strength of more than 1.5 and a flexural modulus at 23° C. (in accordance with ISO 178-93) of less than 700 MPa and preferably between 50 and 250 MPa. Such a composition is useful for manufacturing extrusion blow-moulded parts, especially for cars. It also relates to articles additionally comprising a part made of polyamide and polyolefin or of a mixture of polyamide and polyolefin.
    Type: Grant
    Filed: August 30, 1999
    Date of Patent: March 20, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Alain Bouilloux, Laurent Teze
  • Bimetal supported catalyst based on platinum or silver, its manufacturing process and its use for electrochemical cells
    Patent number: 6194338
    Abstract: The invention relates to a stabilized bimetal catalyst comprising an electrically conductive support and a metallic deposited coating consisting of a first metal M1 chosen from platinum and silver and a second metal M2, different from the first and chosen from the group consisting of platinum, silver, gold, ruthenium, iridium, rhodium and osmium. The invention also relates to a process for obtaining such a catalyst.
    Type: Grant
    Filed: March 2, 1999
    Date of Patent: February 27, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Francoise Andolfatto, Sylvain Miachon
  • Purification of the hydrochloric acid by-product of the synthesis of methanesulphonic acid
    Patent number: 6190635
    Abstract: In order to remove the methanesulphonyl chloride entrained by the gaseous HCl by-product, an amount of water ranging from 0.01 to 20%, relative to the mass of HCl to be treated, is injected into the HCl gas flow and the temperature is lowered to a value below or equal to 15° C.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: February 20, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Jean Ollivier, Rene Clair, Denise Molines, Marc Ferrigno
  • Mixed fluorination catalyst
    Patent number: 6184172
    Abstract: Mixed fluorination catalyst comprising one or more nickel and chromium oxides, halides and/or oxyhalides deposited on a support composed of aluminium fluoride or of a mixture of aluminium fluoride and alumina, characterized in that the weight of nickel/weight of chromium ratio is between 0.08 and 0.25, preferably between 0.1 and 0.2.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: February 6, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Philippe Bonnet, Eric Jorda, Eric Lacroix
  • Peroxide-containing catalyst compositions and the use thereof in the pultrusion process
    Patent number: 6177378
    Abstract: This invention relates to a peroxide-containing catalyst composition which contains 60 to 80% by weight of a ketone peroxide component (A), 10 to 20% by weight of a ketone ester component (B) and 10 to 20% by weight of an inhibitor component (C), wherein the sum of the percentages by weight of components (A), (B) and (C) adds up to 100% by weight. The invention also relates to the use of the peroxide-containing catalyst composition as a starter peroxide composition in the pultrusion process.
    Type: Grant
    Filed: April 21, 1998
    Date of Patent: January 23, 2001
    Assignee: Elf Atochem Deutschland GmbH
    Inventor: Nabil Boulkertous
  • Concentrated aqueous dispersions of water-soluble polymers
    Patent number: 6174950
    Abstract: Concentrated and low viscosity aqueous dispersions, e.g., opaque emulsions, well suited as flocculants for water treatment, comprise the water-soluble polymerizate of at least one water-soluble hydrophilic monomer A, optionally, at least one amphiphilic comonomer B and/or, also optionally, at least one hydrophobic comonomer C, in the presence of at least one polymeric dispersant incompatible therewith, for example an imidized and salified styrene/maleic anhydride copolymer or poly(diallyldimethylammonium chloride).
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: January 16, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Denis Tembou Nzudie, Didier Vanhoye
  • Composition for stripping paints varnishes or lacquers
    Patent number: 6174847
    Abstract: This composition for stripping paints, lacquers or primers is characterized in that it consists of or comprises: (A) 5 to 90 parts by weight of water; (B) 2 to 47.5 parts by weight of benzyl alcohol; (C) 2 to 47.5 parts by weight of dimethyl sulphoxide or N-methylpyrrolidone, (A)+(B)+(C) representing 100 parts by weight.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: January 16, 2001
    Assignee: Elf Atochem, S.A.
    Inventor: Jean-Pierre Lallier
  • Heterogeneous organotin catalysts
    Patent number: 6166235
    Abstract: This invention provides: (a) new organotin functionalized silanes: (b) a solid prepared by chemically bonding organotin functionalized silanes to a solid inorganic support containing surface hydroxy groups: (c) a solid catalyst prepared from said supported organotin functionalized silane; (d) a process for conducting esterification or transesterification, and urethane, urea, silicone, and amino forming reaction utilizing said solid supported catalyst; (e) a process of separating the solid supported catalyst from the reaction products employing ligand-solid separation techniques; (f) reuse of the solid supported catalyst after being separated from the reaction products; (g) a continuous esterification or transesterification reaction or urethane, urea, silicone, or amino form.
    Type: Grant
    Filed: September 25, 1998
    Date of Patent: December 26, 2000
    Assignee: Elf Atochem North America, Inc.
    Inventors: William D. Honnick, Gerald H. Reifenberg, deceased, Kevin C. Cannon
  • Heterogeneous organotin catalysts
    Patent number: 6162755
    Abstract: This invention provides: (a) new organotin functionalized silanes: (b) a solid prepared by chemically bonding organotin functionalized silanes to a solid inorganic support containing surface hydroxy groups: (c) a solid catalyst prepared from said supported organotin functionalized silane; (d) a process for conducting esterification or transesterification, and urethane, urea, silicone, and amino forming reaction utilizing said solid supported catalyst; (e) a process of separating the solid supported catalyst from the reaction products employing ligand--solid separation techniques; (f) reuse of the solid supported catalyst after being separated from the reaction products; (g) a continuous esterification or transesterification reaction or urethane, urea, silicone, or amino form.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: December 19, 2000
    Assignee: Elf Atochem North American, Inc.
    Inventors: William D. Honnick, Gerald H. Reifenberg, deceased, Kevin C. Cannon
  • Pressure-sensitive adhesive which can be applied while hot
    Patent number: 6162868
    Abstract: The present invention relates to a pressure-sensitive adhesive comprising:a mixture of a block copolymer (A) comprising polystyrene blocks and polybutadiene or polyisoprene blocks which are optionally hydrogenated and of a copolymer (B) of ethylene and of an alkyl (meth)acrylate,at least one tackifying resin and optionally a plasticizer,this adhesive being deposited while hot on a substrate.These products are useful for self-adhesive labels and tapes.
    Type: Grant
    Filed: September 24, 1998
    Date of Patent: December 19, 2000
    Assignee: Elf Atochem S.A.
    Inventors: Eric Radigon, Jean Lebez, Jean-Michel Pierrot
  • Cold cleaning composition based on alkanes or cycloalkanes and an organic compound comprising a ketone group
    Patent number: 6162779
    Abstract: A composition for cleaning solid surfaces, under cold conditions, in non-aqueous medium consists essentially of a mixture of alkanes or cycloalkanes and at least one organic compound comprising at least one ketone function, the composition having a flashpoint above or equal to 40.degree. C. and below 55.degree. C., measured according to ASTM standard D56-70.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: December 19, 2000
    Assignee: Elf Atochem, S.A.
    Inventors: Pascal Michaud, Jean-Jacques Martin
  • Inhibition of 141b decomposition
    Patent number: 6159346
    Abstract: Inhibition of the formation of unsaturated carbon compounds during the heating of 141b involving the addition of various inhibitors such as dialkylhydroxylamine and/or the use of a vessel made of a nickel alloy.
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: December 12, 2000
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh, Anthony D. Kelton, Morris P. Walker, Danny W. Wright
  • Composition based on organotin maleates which can be used to stabilize and lubricate thermoplastic polymers, Process for producing the said composition
    Patent number: 6156832
    Abstract: The invention relates to a composition containing organotin maleates such as is obtained by reacting a mixture of a low molecular weight alcohol or epoxyalkane and of a high molecular weight alcohol or epoxyalkane with maleic anhydride and by then bringing the mixture thus obtained into contact with a dialkyltin oxide. The invention also relates to poly(vinyl chloride) (PVC) composition stabilized and lubricated using the said composition based on organotin maleates and also to the extruded rigid objects formed from the said PVC compositions.
    Type: Grant
    Filed: January 9, 1998
    Date of Patent: December 5, 2000
    Assignees: Elf Atochem North American, Inc., Elf Atochem S.A.
    Inventors: Chris Bertelo, Muriel Cuilleret, Stephane Girois, Patrick Morel
  • Bacteriostatic compositions and use in metal working fluids
    Patent number: 6153566
    Abstract: The present invention concerns bacteriostatic compositions comprising a bacteriostatic agent selected from the group comprising amides and amine salts of normal heptanoic acid and amides, amine salts and alkyleneoxide addition compounds of undecylenic acid. It also concerns the use of said compositions in the field of metal working fluids.
    Type: Grant
    Filed: June 3, 1998
    Date of Patent: November 28, 2000
    Assignee: Elf Atochem S.A.
    Inventors: Aki Yonekura, Toshifumi Hatanaka, Tetsushi Kawamura, Henri-Jean Caupin
  • Process for impregnation of electrical capacitors
    Patent number: 6154357
    Abstract: The invention relates To a process for the impregnation of electrical capacitors which includes performing the impregnation of the coil winding with a dielectric fluid, eliminating the excess of the dielectric fluid, filling the casing containing the impregnated coil winding with a gelable composition and the dielectric fluid for impregnating the coil winding and gelling the gelable composition.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: November 28, 2000
    Assignee: Elf Atochem S.A.
    Inventor: Noelle Berger