Patents Assigned to Elf Atochem
  • Regenerating of acids, particularly of strong organic acids, using bipolar membranes
    Patent number: 5993629
    Abstract: An electrodialysis method using a bipolar membrane (BP) for regenerating acids, wherein a series of base (B), acid (A) and salt (S) compartments are provided between a positive electrode (anode) and a negative electrode (cathode), said compartments being defined by a series of membranes: cationic, bipolar, anionic, cationic, bipolar and so forth, and a solution being circulated through each compartment. An additional anionic membrane (10) is applied to the anionic side (11) of the bipolar membrane (BP) with no discernible gap therebetween so that contamination of the acid compartment by cations is reduced.
    Type: Grant
    Filed: July 17, 1997
    Date of Patent: November 30, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Claude Gavach, Christian Gancet, Alfred Mirassou, Frederic Perie
  • Mixtures of bitumen, of powdered rubber waste and of polymer, employed as road binder
    Patent number: 5990207
    Abstract: The present invention relates to mixtures of bitmen, of powdered rubber waste and of at least one copolymer (A) of an alpha-olefin and of at least one unsaturated epoxide, such that:the Brookfield viscosity at 180.degree. C. according to NFT Standard 76102 (27 needle) is lower than 1150 mPa s;the difference in absolute value of the softning points (ring-and-ball temperature) according to NFT 66008 between the top and bottom fractions of a mixture stored for 3 days at 180.degree. C. in a vertical tube is smaller than or equal to 5.degree. C. These mixtures are useful as road binders.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: November 23, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Patrice Perret, Jean Lebez, Guillaume Montignac
  • Stripping composition based on water and anisole
    Patent number: 5990063
    Abstract: The present invention is related to a stripping composition for paints, varnishes or lacquers. This composition contains at least water and anisole.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: November 23, 1999
    Assignee: Elf Atochem S.A.
    Inventor: Jean-Pierre Lallier
  • Composition based on high molecular weight organotin maleates which can be used to stabilize thermoplastic polymers, process for producing the said compositions
    Patent number: 5985967
    Abstract: The invention relates to a composition containing high molecular weight organotin maleates as obtained by reacting a high molecular 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 the poly(vinyl chloride) (PVC) compositions stabilized using the said composition based on high molecular weight organotin maleates and also to the extruded rigid items formed from the said PVC compositions.
    Type: Grant
    Filed: January 9, 1998
    Date of Patent: November 16, 1999
    Assignees: Elf Atochem North America Inc., Elf Atochem S.A.
    Inventors: Muriel Cuilleret, Patrick Morel, James L. Reilly, Peggy S. Schipper
  • Blends of thermoplastic and rubber which are adherent to thermoplastics
    Patent number: 5985392
    Abstract: Composite including a rubber/thermoplastic blend adherent by itself to a thermoplastic material; the blend is in the form of a thermoplastic matrix containing rubber nodules functionalized and vulcanized during the mixing with the thermoplastic. Composite articles obtained by overmoulding the vulcanized rubber/thermoplastic blend onto the thermoplastic.
    Type: Grant
    Filed: January 2, 1997
    Date of Patent: November 16, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Marius Hert, Patrick Alex, Martine Cerf, Christian Dousson
  • Deoxyglucopyranoside compounds for inducing/stimulating hair growth and/or retarding hair loss
    Patent number: 5985841
    Abstract: A regimen for inducing/stimulating hair growth and/or retarding hair loss on an individual in need of such treatment comprises topically applying to the affected hair and/or scalp of such individual, a hair growth stimulating and/or hair loss retarding effective amount of at least one 2,3-dihydroxypropyl-2-(1-oxohydrocarbyl) amino-2-deoxyglucopyranoside having the structural formula: ##STR1## in which R is a linear or branched, saturated or unsaturated hydrocarbon radical having from 5 to 21 carbon atoms.
    Type: Grant
    Filed: April 6, 1998
    Date of Patent: November 16, 1999
    Assignee: ELF Atochem S.A.
    Inventors: Daniel Bernard, Henri-Jean Caupin, Serge Petit
  • Composition including a fluoroelastomer and a thermoplastic polyamide and resulting film
    Patent number: 5986005
    Abstract: The present invention relates to a modifier composition, a stock mixture and a final composition comprising a fluoro elastomer and a thermoplastic polyamide, as well as to the film obtained from the final composition.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: November 16, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Regis Jacquemet, Jean-Jacques Labaig, Joachim Merziger
  • Multilayer films which can be welded by high frequency
    Patent number: 5985390
    Abstract: The invention relates to a multilayer film, which is useful for making flexible sachets, comprising (i) a barrier film based on a mixture of polyamide and of polyolefin, and (ii), on at least one of its faces, a film based on a copolymer of ethylene and of an unsaturated ester, which can be welded by high frequency.The invention is useful for making flexible sachets of detergents, of bleach or of textile softeners.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: November 16, 1999
    Assignee: Elf Atochem S.A.
    Inventor: Michel DeGrand
  • Organotin sulfonate catalysts and their manufacture
    Patent number: 5981685
    Abstract: Dual cure organotin salts of strong organic acids, the use of such salts as catalysts and an improved process for producing the catalysts are provided. The catalysts are capable of effectively catalyzing esterification and transesterification reactions and urethane, silicone, melamine, ester and acrylic forming reactions and can simultaneously catalyze more than one reaction in a mixture of urethane, silicone, amino, ester and acrylic polymer forming reactants to produce a polymer mixture.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: November 9, 1999
    Assignee: ELF Atochem North America, Inc.
    Inventors: Sri R. Seshadri, William D. Honnick, Melvin H. Gitlitz
  • Method for preparing .alpha., .omega.-bromochloroalkanes
    Patent number: 5981815
    Abstract: The invention relates to a process for the preparation of .alpha.,.omega.-bromochloroalkanes. A cyclic ether is hydrobrominated and then the phase obtained is reacted, without any prior purification or separation, with thionyl chloride.
    Type: Grant
    Filed: May 5, 1998
    Date of Patent: November 9, 1999
    Assignee: ELF Atochem, S.A.
    Inventors: Gilles Drivon, Christophe Ruppin
  • Separation of sludge from liquid by piston-aided filtration
    Patent number: 5979304
    Abstract: An apparatus and a method using the apparatus are described for the separation by filtration of a solid phase and a liquid phase from a sludge. A pressure is exerted on the sludge with the aid of a piston in a filtration chamber having a filter. The filter is extracted from the chamber and the surface of the filter is swept using a scraper device. The invention can be used for the treatment of liquid manure.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: November 9, 1999
    Assignee: Elf Atochem S.A.
    Inventor: Marcel Norais
  • Peroxyoxalates derived from hydroxy-hydroperoxides
    Patent number: 5981787
    Abstract: Novel peroxyoxalate compositions of Structure A, ##STR1## and use of the novel monoperoxyoxalates of Structure A as initiators for polymerizing ethylenically unsaturated monomers and for curing of unsaturated polyester resins are disclosed.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: November 9, 1999
    Assignee: Elf Atochem North America, Inc.
    Inventors: Jose Sanchez, Daryl L. Stein
  • Use of a deodorizer based on undecylenic acid or on derivatives of the said acid to deodorize papers, cardboards and nonwovens
    Patent number: 5976460
    Abstract: The invention relates to the use of a deodorizer including undecylenic acid or a salt or an alkyl or polyoxyalkylenic ester or undecylenic acid to deodorize papers, cardboards and nonwovens. The invention also relates to papers, cardboards and nonwovens containing the above mentioned deodorizer.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: November 2, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Lucien Bourson, Henri-Jean Caupin
  • Anionically copolymerized living random (meth)acrylic copolymers and copolymers prepared therefrom
    Patent number: 5977261
    Abstract: Living random (meth)acrylic copolymers, facilely converted into random co(meth)acrylates and block copolymers thereof, comprise the anionic copolymerizates of at least one comonomer A with at least one comonomer B selected from among the (meth)acrylates and maleimides, at least one of the comonomers A and B comprising a (meth)acrylate, in the presence of (i) at least one alkali or alkaline earth metal, mono- or difunctional initiator and (ii) at least one ligand, for example a nonnitrogenous macrocyclic complexant, e.g., a crown ether, or an alkali metal alcoholate.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: November 2, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Jin-shan Wang, Philippe Bayard, Philippe Teyssie, Bruno Vuillemin, Philippe Heim
  • Shell/core particulates of superabsorbent polymers
    Patent number: 5976696
    Abstract: Shell/core distortion-resistant particulates of a partially crosslinked superabsorbent polymer, the gradient of partial crosslinking of which being to such extent that the shells are harder and less flexible than the cores thereof, have a capacity to absorb 0.9% saline water of at least 50 g/g and the modulus of which is at least 35,000 Pa; a bed of a saline water gel of the subject particulates has a saline water absorption of at least 20 g/g and a porosity of at least 500 g.
    Type: Grant
    Filed: February 7, 1997
    Date of Patent: November 2, 1999
    Assignee: Elf Atochem, S.A.
    Inventors: Christian Collette, Manuel Hidalgo, Andre Kowalik, Emmanuel Puchois
  • Base paints comprised of polyamide powders for use in coating PVC structures
    Patent number: 5972514
    Abstract: The invention relates to a coating composition for PVC sections, based on a polymeric vehicle, a crosslinking agent, and a thermoplastic resin powder. The coating composition is particularly useful for coating PVC sections for windows, shutters, and doors. PVC joinery coated with the composition of the invention has exceptional impact strength and resistance to abrasion, friction, and inclement weather.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: October 26, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Bruno D'Herbecourt, Thierry Moulin
  • Water repellent composition
    Patent number: 5973055
    Abstract: The invention relates to a water repellent composition (<<Rain Repellent>>), comprising a hydrophobic agent and a solvent compatible with the hydrophobic active agent, characterized in that the solvent comprises at least one fluorinated hydrocarbon, liquid at ambient temperature, and in that the active hydrophobic agent is a compound of organopolysiloxane type.The invention also relates to a disposable pressurized container containing the above composition and an inert gas.The invention finds application in particular in the removal of water from a surface especially the windscreen of vehicles or aircraft.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: October 26, 1999
    Assignees: Aerospatiale Societe Nationale Industrielle, Elf Atochem S.A.
    Inventors: Pascal Michaud, Bruno Costes, Yves Henry, Pierre Lascours
  • Polyamide injection mouldings which include an impact strength modifier that has a particular distribution in the polyamide
    Patent number: 5965668
    Abstract: The invention relates to impact-resistant injection mouldings based on polyamide resin (A) and on a disperse phase whose particles have a number-average diameter greater than 0.4 .mu.m, a volume-average diameter greater than 1 .mu.m and such that more than 50% by volume of the particles are larger than 1 .mu.mThe disperse phase may consist of a mixture including at least one copolymer (B) of ethylene and of an unsaturated epoxide and of at least one polyolefin (C).
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: October 12, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Patrice Perret, Alain Bouilloux
  • Method for reducing deposition of cokes in heat-refining process of petroleum high-molecular hydrocarbons, and additive used in the method
    Patent number: 5965011
    Abstract: Method for reducing deposition of cokes in heat-refining process of petroleum high-molecular hydrocarbons, characterized in that heat-treatment in a heating unit is effected in the presence of at least one compound (I) having at least one mercaprtoalkylthio group:HS--C.sub.m H.sub.2m --S--in which "m" is an integer of 2 to 4.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: October 12, 1999
    Assignees: Nippon Shokubai Co., Ltd., Elf Atochem, S.A.
    Inventors: Toshifumi Hatanaka, Kazuya Hata, Tetsushi Kawamura, Hirokazu Itoh, Yoshiro Arita
  • Cleaning or drying compositions based on 1,1,1,2,3,4,4,5,5,5-decafluoropentane
    Patent number: 5965511
    Abstract: In order to replace compositions based on CFC or on HCFC in applications for cleaning or drying solid surfaces (in particular defluxing), the invention proposes azeotropic or virtually azeotropic compositions based on 1,1,1,2,3,4,4,5,5,5-decafluoropentane, methylene chloride and optionally methanol.
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: October 12, 1999
    Assignee: Elf Atochem S. A.
    Inventors: Pascal Michaud, Jean-Jacques Martin