Patents Assigned to Atochem
  • Process for the preparation of delignified and bleached chemical paper pulps
    Patent number: 6019870
    Abstract: A process of dignifying lignocellulosic pulp with oxygen followed by treatment of the delignified pulp with a chelating agent, followed by washing, followed by treatment with hydrogen peroxide at an alkaline pH in the presence of an alkali metal silicate at a temperature greater than 100.degree. C. and a pressure greater than 1.5 times the saturated vapor pressure.
    Type: Grant
    Filed: January 17, 1997
    Date of Patent: February 1, 2000
    Assignee: Elf Atochem S.A.
    Inventors: Michel Devic, Jean-Pierre Schirmann
  • Process for purification of dimethyl sulphoxide (DMSO)
    Patent number: 6020530
    Abstract: To purify a dimethyl sulfoxide (DMSO), this DMSO is placed in contact with an ion exchange resin of sulfonic type in --SO.sub.3 NH.sub.4 form, and the DMSO is then separated from the resin. The DMSO thus obtained has an iron cation content lower than 1 ppb and a sodium cation content lower than 2 ppb.
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: February 1, 2000
    Assignee: Elf Atochem S.A.
    Inventors: Annie Commarieu, Francis Humblot
  • Multilayer material comprising a film carrying layer of silicon oxide and a polyolefin film
    Patent number: 6017638
    Abstract: A material is provided comprising a film carrying a layer of a silicon oxide, a film comprising a binder and a film comprising polyolefin, wherein said film comprising the binder further comprises a catalyst. The invention also relates to a package comprising this material and the use of a catalyst in a film comprising a binder arranged between a film carrying a silicon oxide layer and a polyolefin film, for improving adhesion.
    Type: Grant
    Filed: May 19, 1997
    Date of Patent: January 25, 2000
    Assignee: Elf Atochem S.A.
    Inventors: Patrice Breant, Philippe Tordjeman
  • Antistatic belts
    Patent number: 6018015
    Abstract: The invention relates to belts made of thermoplastic polymer (A) and comprising a sufficient amount of a polymer (B) to render them antistatic, the said polymer (B) comprising polyethylene glycol blocks. Use is advantageously made of polymers (A) containing polyamide-6 (PA-6) or polyamide-12 (PA-12) blocks and polytetramethylene glycol blocks and polymers (B) containing PA-6 or PA-12 blocks and polyethylene glycol blocks.
    Type: Grant
    Filed: November 2, 1998
    Date of Patent: January 25, 2000
    Assignee: Elf Atochem S.A.
    Inventors: Patrick Alex, Jun Yamamoto
  • Azeotrope of HF and 1233zd
    Patent number: 6013846
    Abstract: An azeotrope containing HF and 1233zd is provided, as are methods for separating this azeotrope from mixtures of HF and 1233zd which are HF-rich or 1233zd-rich and methods for making use of the azeotrope and separation methods to improve processes for preparing 1233zd, an intermediate used in the preparation of 245fa. 245fa is a known foam blowing agent and refrigerant.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: January 11, 2000
    Assignee: Elf Atochem North America, Inc.
    Inventors: John A. Wismer, Michael S. Bolmer, Bin Chen
  • Method for strengthening a brittle oxide substrate
    Patent number: 6013333
    Abstract: A method is described for strengthening or restoring strength to a brittle oxide substrate which includes the steps of coating the brittle oxide substrate with an aqueous solution containing a silane-based composition, and curing the coating to form a transparent layer on the brittle oxide substrate. Also disclosed are novel compositions used to coat brittle oxide substrates, and silane-coated brittle oxide containers.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 11, 2000
    Assignee: Elf Atochem North America, Inc.
    Inventors: Stephen W. Carson, Ryan R. Dirkx, Victor D. Papanu, Neil D. Conrad
  • Process for impregnation of electrical capacitors
    Patent number: 6010743
    Abstract: The invention relates to a process for impregnation of electrical capacitors which consists in performing the impregnation of the coil winding with a dielectric fluid and then eliminating the excess of the said fluid and in filling the casing containing the said impregnated coil winding with a gelable composition including the said dielectric fluid for impregnation of coil winding.
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: January 4, 2000
    Assignee: Elf Atochem S.A.
    Inventor: Noelle Berger
  • Self-Adhesive compositions for coating metal substrates with improved resistance to creep
    Patent number: 6011100
    Abstract: The invention relates to a self-adhesive powder composition with improved resistance to creep, based on thermoplastic and/or heat-curable resins and acicular calcium carbonate. The composition is applied in powder form onto a metal substrate and then a creep-resistant coating is obtained by melting the powder.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: January 4, 2000
    Assignee: Elf Atochem S.A.
    Inventors: Patrick Douais, Didier Juhue, Olivier Julien, Michael Werth
  • Metal containing e-coat catalysts optionally with tin catalysts
    Patent number: 6001900
    Abstract: The invention comprises a curable composition comprising: (i) a blocked reactive component wherein the blocked reactive component is a blocked isocyanate or a blocked isothiocyanate; (ii) a functional compound reactive with the blocked reactive component, the functional compound containing reactive hydrogen; (iii) a catalyst for promoting the reaction of the reactive component with the blocked functional compound, wherein said catalyst is based on the reaction product of manganese, cobalt, nickel, copper, zinc, germanium, antimony, or bismuth, or the oxides thereof with a mercaptan, or an organic acid, wherein said organic acid is hexanoic, oxalic, adipic, lactic, tartaric, salicylic, thioglycolic, succinic, or mercapto succinic acid, or the reaction product of copper or germanium, or the oxides thereof with a lower aliphatic acid.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: December 14, 1999
    Assignee: Elf Atochem North America, Inc.
    Inventors: Emily C. Bossert, Kevin Cannon, William D. Honnick, Wayne Ranbom
  • Paint stripping composition
    Patent number: 6001192
    Abstract: Inexpensive paint stripper compositions containing neither chlorinated nor alkaline solvents and well adapted for removing paints such as glycerophtalic, alkyd-urethane or arylic urethane paints on a variety of substrates, e.g. wood and metal substrates comprise (a) 1 to 99% by volume of an aprotic polar solvent chosen from the group comprising: dimethyl sulfoxide, dimethyl formamide, N-methylpyrrolidone, N-methylmorpholine, .gamma.-butyrolactone, acetonitrile and mixtures thereof; and (b) 99 to 1% by volume of an ether selected from the family of ethers having a flash point higher than 0.degree. C., a molar volume less than 160 and a molecule that includes one or several methoxy groups.
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: December 14, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Jean-Pierre Lallier, Stephane Fouquay
  • Unsaturated organometallic compounds derived from titanium and process for their preparation
    Patent number: 5998646
    Abstract: These compounds are denoted by the formula (I): ##STR1## in which R denotes a tert-butyl, tert-amyl or 2-ethylhexyl radical. To prepare them, methacrylic acid is reacted with a tetraalkoxytitanium Ti(OR).sub.4, where R=isopropyl or tert-butyl, to obtain a corresponding compound (I), or with Ti(OR) (OtAm).sub.3, where R=isopropyl or tert-butyl and tAm=tert-amyl, to obtain a compound (I) with R=tert-amyl, the compounds (I) with R=isopropyl or tert-butyl furthermore denoting intermediate synthesis products which can be reacted with tert-amyl alcohol or with 2-ethylhexanol, to obtain a compound (I) in which R denotes tert-amyl or 2-ethylhexyl respectively.
    Type: Grant
    Filed: November 4, 1998
    Date of Patent: December 7, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Alain Riondel, Michel Camail, Andre Margaillan, Jean-Louis Vernet, Marie Humbert
  • Mixtures of polymer having polyamide blocks and copolymers having vinylaromatic units and anhydride units
    Patent number: 5998545
    Abstract: The present invention relates to a mixture of polymers (A) having polyamide blocks and copolymers (B) comprising vinylaromatic units and unsaturated carboxylic anhydride units, the quantity of (B) being sufficient for the melt index (or melt flow index, MFI) of the mixture of (A) and (B) to be less than the melt index of (A) alone.It also relates to masterbatches of (A) and (B).
    Type: Grant
    Filed: January 22, 1998
    Date of Patent: December 7, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Denis Melot, Alain Bouilloux, Benoit Ernst
  • Method for preparing .alpha.,.omega.-bromochloroalkanes
    Patent number: 5994600
    Abstract: To prepare .alpha.,.omega.-bromochloroalkanes, a cyclic ether, to which water has optionally been added, is hydrochlorinated and then the resultant phase is reacted, without any prior purification or separation, with gaseous hydrobromic acid.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: November 30, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Gilles Drivon, Christophe Ruppin
  • Preparation of rapidly dissolving/absorbing powders of hydrophilic/super absorbent (CO)polymers
    Patent number: 5994419
    Abstract: Rapidly dissolving/absorbing free-flowing powders of hydrophilic/superabsorbent (co)polymers, having irregular nonspherical morphology and a particle size distribution ranging from 100 .mu.m to 800 .mu.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: November 30, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Christian Collette, Manuel Hidalgo, Jean-Marc Corpart, Andre Kowalik, Paul Mallo
  • Acrylic polymers for molding
    Patent number: 5994441
    Abstract: Use of monovalent salts of saturated and unsaturated fatty acids C.sub.10 -C.sub.18 as external lubricants in granules formulation based on acrylic polymers for injection molding at temperatures from 180.degree. C.-220.degree. C. of articles having a thickness greater than 10 mm, preferably the lubricant amount is from 10 to 100 ppm; and related compositions.
    Type: Grant
    Filed: April 18, 1996
    Date of Patent: November 30, 1999
    Assignee: ELF Atochem Italia S.r.l.
    Inventors: Andrea Anghileri, Michele Fatica, Pasquale Relvini
  • Scorch resistant peroxidic compositions
    Patent number: 5994473
    Abstract: Peroxidic compositions utilizable for curing elastomers and polyolefins having scorch retardant properties, which comprise:(A) a peroxide in powder or in the form of granules or master batch(B)+(C) inhibitor and promoter in powder, granules or master batch,wherein (B) is an inhibitor derived from hydroquinone and (C) is a curing promoter.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: November 30, 1999
    Assignee: Elf Atochem Italia S.r.l.
    Inventors: Carlo Sempio, Giorgio Angeloni, Massimo Cesana, Luciano Abrigo
  • Fibres coated with a hydrophobic material
    Patent number: 5993965
    Abstract: The invention relates to fibers coated with a hydrophobic material based on an epoxidized polydiene oligomer. This coating results from the photopolymerization of a composition comprising at least one expoxidized polydiene oligomer, at least one photoinitiator salt and optionally a reactive diluent. The invention relates in particular to optical fibers.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: November 30, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Jean-Jacques Flat, Evelyne Bonnet
  • 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
  • Coating of metal surfaces, its application to tubes and to cables
    Patent number: 5993924
    Abstract: The invention relates to a coated metal surface including successively, starting at the metal, at least one layer of polyurethane and at least one layer of thermoplastic polymer, it being possible for a binder to be placed between the polyurethane and the thermoplastic polymer.It is useful for covering pipes, electrical cables, telecommunication cables and stay wires.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: November 30, 1999
    Assignee: Elf Atochem S. A.
    Inventors: Maxime Deroch, Evelyne Bonnet, Jean-Jacques Flat
  • Stripping composition based on polar aprotic solvent, an ether and water
    Patent number: 5994282
    Abstract: Stripping compositions based on a polar aprotic solvent, an ether and water. The composition is characterized in that it comprises at least the following: 1) a polar aprotic solvent, especially dimethyl sulfoxide (DMSO) or N-methyl pyrrolidinone (NMP); 2) an ether chosen from anisole and tetrahydrofuran (THF); 3) water.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: November 30, 1999
    Assignee: Elf Atochem, S.A.
    Inventor: Jean-Pierre Lallier