Patents Assigned to Atochem
  • Aminotelechelic partially hydrogenated 1,3-diene oligomers and process for the preparation of these compounds
    Patent number: 5760157
    Abstract: Compounds of the formula?P!(ACH.sub.2 NH.sub.2).sub.xin which P denotes a partially hydrogenated 1,3-diene oligomer residue, x is practically equal to 2 and A denotes a divalent residue such as ##STR1## are obtained by selective hydrogenation of compounds of formula ?P.sub.1 !(ACN)x in which P.sub.1 denotes a 1,3-diene oligomer residue.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: June 2, 1998
    Assignee: Elf Atochem, S.A.
    Inventors: Martine Cerf, Stephane Fouquay, Joel Perthuis
  • Abrasion-resistant compositions and their use as floor coverings
    Patent number: 5760140
    Abstract: The invention relates to a composition based on ethylene copolymers for manufacturing floor coverings and comprising: a) a copolymer having at least one epoxide functional group, b) a copolymer of ethylene and of at least one unsaturated monomer having functional groups which are reactive with the epoxide functional group of a), c) fillers, and optionally d) ethylene-vinyl acetate or ethylene-alkyl (meth)acrylate copolymers. The floor coverings obtained have an abrasion according to DIN 53516 of less than 300 mm.sup.3, a resistance to scratching which is greater than 150 g, and an oxygen index which is greater than 30.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: June 2, 1998
    Assignee: Elf Atochem S.A.
    Inventor: Jean-Michel Pierrot
  • Star-shaped copolymers and process for their manufacture
    Patent number: 5756585
    Abstract: A process for manufacturing a star shaped block polymer of formula (PA--PB--PC).sub.n --N--(PD--PE).sub.m wherein PA, PB and PC are respectively vinylaromatic/methacrylic blocks, acrylic blocks and methacrylic blocks. PD is a polymer block selected from vinylaromatic and/or methacrylic monomer units, PE is an acrylic polymer block, n is 2 to 20 and m is 0 to 18 with the proviso that m+n is .ltoreq.20. The process proceeds by anionic polymerization in the presence of a monofunctional initiator of formula (II),(R).sub.p --Mwherein M is an alkali or alkaline earth metal, p is 1 or 2 and R is a straight or branched alkyl radical having 2 to 6 carbon atoms or a C.sub.1 to C.sub.6 substituted alkyl radical.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: May 26, 1998
    Assignee: Atochem
    Inventors: Philippe Teyssie, Roger Fayt, Sunil K. Varshney, Christian Jacobs
  • Paint stripping composition
    Patent number: 5753603
    Abstract: Inexpensive paint stripper compositions containing neither chlorinated nor alkaline solvents and well adapted for removing paints such as glycerophtalic, alkyd-urethane or acrylic 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: June 2, 1993
    Date of Patent: May 19, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Jean-Pierre Lallier, Stephane Fouquay
  • Method for coproducing difluoromethane and 1,1,1,2-tetrafluoroethane
    Patent number: 5750810
    Abstract: The present invention relates to the simultaneous manufacture of difluoromethane (F32) and 1,1,1,2-tetrafluoroethane (F134a) by pyrolysis of chlorodifluoromethane in the presence of hydrogen, working at a temperature above 500.degree. C. in the absence of any catalyst or metal surface. Depending on the operating conditions chosen, this process also makes it possible predominantly to manufacture either F134a or F32.
    Type: Grant
    Filed: July 30, 1997
    Date of Patent: May 12, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Jean-Pierre Schirmann, Serge Hub, Andre Lantz
  • Plastic composite material, a method of producing it and the use of this material
    Patent number: 5750232
    Abstract: This invention relates to a plastic composite material which comprises:a thermoplastic plastic sheet and, bonded to one side thereof,a thermoplastic spun felt comprising a hot-melt adhesive, to a method of producing it and to its use.
    Type: Grant
    Filed: June 27, 1995
    Date of Patent: May 12, 1998
    Assignee: Elf Atochem Deutschland GmbH
    Inventors: Roland Eugen Steenblock, Joachim Buhrmann
  • Process for the manufacture of sec-butyl acrylate by reaction of acrylic acid and butene isomers
    Patent number: 5750771
    Abstract: This process for the manufacture of sec-butyl acrylate by reaction of acrylic acid and at least one butene in the presence of a macroporous cationic resin containing sulphonic acid groups is characterized in that the reaction is carried out using a molar ratio of the acrylic acid to the butene(s) used which is greater than 1, the crude reaction product comprising residual acrylic acid, dissolved butene isomers, the desired sec-butyl acrylate, octenes, 2-butanol and heavy addition products, and in that the desired sec-butyl acrylate is separated from the crude reaction product.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: May 12, 1998
    Assignee: ELF Atochem S.A.
    Inventors: Jean Michel Paul, Yves Samuel, Marc Esch
  • Process and composition for degreasing the surface of an object
    Patent number: 5749977
    Abstract: For degreasing the surface of an object, applying thereto a composition containing at least 25% by weight of an amphiphilic compound of the formula A--B, wherein A is a lipophilic and hydrophobic radical and B is a hydrophilic radical, e.g., an alkyleneglycol ether oxide having a terminal group of at least 10 carbon atoms, then rinsing the surface with water.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: May 12, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Jean-Pierre Lallier, Daniel Bignon
  • Cleaning compositions based on 1,1,1,2,2,4,4-heptafluorobutane and C.sub.1 -C.sub.3 alcohols
    Patent number: 5747437
    Abstract: To replace compositions based on CFC or CFHC in applications for cleaning solid surfaces (in particular defluxing), the invention proposes azeotropic or quasi-azeotropic compositions based on 1,1,1,2,2,4,4-heptafluorobutane and a C.sub.1 -C.sub.3 alcohol.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: May 5, 1998
    Assignee: Elf Atochem S.A.
    Inventor: Pascal Michaud
  • Mixtures of polymers including a halogen-containing polymer and compatibilized with a grafted aliphatic polyester
    Patent number: 5747605
    Abstract: The invention relates to mixtures of polymers including at least one halogen-containing polymer and compatibilized with a grafted aliphatic polyester. The compatibilizing agent may be, for example, a polycaprolactone grafted with maleic anhydride or glycidyl methacrylate.
    Type: Grant
    Filed: November 8, 1995
    Date of Patent: May 5, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Patrice Breant, Alain Bouilloux
  • Undecylenate deodorants for animal feeds
    Patent number: 5747090
    Abstract: Otherwise malodorous animal feeds are deodorized by treating same with an effective foodstuff deodorizing amount of polyoxyalkylene ester of undecylenic acid.
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: May 5, 1998
    Assignees: Delta Agro Industries, Atochem
    Inventors: Aime Menassa, Henri Caupin
  • Fluorinated polymer having improved heat stability
    Patent number: 5744561
    Abstract: The invention relates to the use of fluorinated copolymers based on trifluoroethylene (VF3) and tetrafluoroethylene (C.sub.2 F.sub.4), having melting points above 210.degree. C. and soluble in the customary polar solvents, as protective coatings for a variety of substrates (plates, wires, cables, fibers, etc.) in the form of extruded films or sheaths or in the form of varnishes and paints.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: April 28, 1998
    Assignee: Elf Atochem S.A.
    Inventor: Patrick Kappler
  • 1,5-diethenylnaphthalene compounds and bifunctional primers for anionic polymerization prepared therefrom
    Patent number: 5744558
    Abstract: Bifunctional primer naphthalene compounds having the formula: ##STR1## wherein M" is an alkali metal, preferably sodium or lithium, and R.sup.1 and R.sup.2 are, e.g., alkyl radicals, are prepared from corresponding 1,5-diethenylnaphthalene derivatives, and are well suited for the improved anionic polymerization of diene, vinylaromatic and/or (meth)acrylic monomers.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: April 28, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Turgut Nugay, Gerard Riess
  • Process for the preparation of alkylimidazolidone (meth)acrylates
    Patent number: 5744613
    Abstract: To obtain a compound of formula (I), an anhydride (II) is reacted with a heterocyclic alcohol (III). After the reaction, the excess (meth)acrylic anhydride can be hydrolysed to (meth)acrylic acid by addition of water and heating between 25.degree. and 70.degree. C., preferably between 30.degree. and 50.degree. C., in order to obtain the compound (I) in solution in water and (meth)acrylic acid: ##STR1## R.sup.1 .dbd.H or CH.sub.3 ; A and B each independently represent a straight- or branched-chain C.sub.2 -C.sub.5 alkylene group.
    Type: Grant
    Filed: October 17, 1996
    Date of Patent: April 28, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Alain Riondel, Jean-Michel Paul
  • Ammonium bicarbonate/ammonium carbamate activated benzyl alcohol paint stripper
    Patent number: 5744438
    Abstract: Stripping action of an alkaline paint stripper is improved when ammonia is partially or completely replaced with ammonium bicarbonate or chemical equivalent thereof which decomposes into ammonia and carbon dioxide. A benzyl alcohol solvent system containing at least ammonium bicarbonate is preferably a water-in-oil emulsion emulsified with oleic hydroxyethyl imidazoline and thickened with hydroxypropyl cellulose or hydroxypropyl methylcellulose. A mixture of ammonium carbamate and ammonium bicarbonate identified as ammonium carbonate is the preferred activator for this alkaline paint stripper. Improved stripping can also be provided by reacting ammonium bicarbonate and ammonia in situ within the water-in-oil emulsion.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: April 28, 1998
    Assignee: Elf Atochem North America, Inc.
    Inventor: John Distaso
  • Solid catalytic component containing zirconium and cycloalkadienyl groups, process for producing it and process for the polymerization of olefins in its presence
    Patent number: 5739226
    Abstract: The solid catalytic component according to the invention is obtained bya) treatment of a catalytic component support with ZrCl.sub.4 or HfCl.sub.4 in the gas phase, followed by ab) treatment with a solution or suspension of a compound capable of grafting a group containing the cycloalkadienyl skeleton to the Zr or Hf contained in the support. Polymerization of olefins in the presence of such a catalytic component results in polymers with low polydispersities, which polymers are obtained with high productivities.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: April 14, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Roger Spitz, Veronique Pasquet, Jerome Dupuy, Jean Malinge
  • Composition based on stabilized methylene chloride which can be used for degreasing metals
    Patent number: 5739090
    Abstract: The invention relates to a composition based on stabilized methylene chloride composed essentially of at least one 1,2-epoxyalkane and of at least one acetal, and no nitroalkane.The composition according to the invention can be used for degreasing, cleaning and/or drying metal components.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: April 14, 1998
    Assignee: Elf Atochem S.A.
    Inventor: Pascal Michaud
  • Process for preparing acrylic polymers with acrylamido methylpropan-sulphonic acid dispersants
    Patent number: 5733992
    Abstract: Process for the polymerization in aqueous suspension of acrylic monomers in the presence of a polymeric suspending agent, homopolymer or copolymer of a compound of formula: ##STR1## wherein: R.sub.1 is H or CH.sub.3 ; R.sub.2 and R.sub.3, equal or different, are H or alkyls C.sub.1 -C.sub.8, optionally branched when possible; M is an alkaline or alkaline-earth metal or ammonium and A is NH, O or NCH.sub.3, characterized in that the polymerization aqueous phase is wholly or partly formed by the mother waters obtained after the separation of the acrylic polymer, so as to have a polymerizable suspension containing at least 0,01% by weight and up to about 1% of said suspending agent and at least from 0.05% to 5% by weight of the other products above mentioned obtained during the polymerization.
    Type: Grant
    Filed: October 24, 1996
    Date of Patent: March 31, 1998
    Assignee: Elf Atochem Italia S.r.l.
    Inventors: Pasquale Relvini, Fabio Giberti
  • Process for recovery of the light noble products present in the distillation residues from the processes for the manufacture of acrylic acid and of its esters
    Patent number: 5734075
    Abstract: To recover these noble products consisting of acrylic acid monomer, acrylic ester monomers and alcohols, a thermal cracking is performed in the absence of catalyst on a mixture of heavy distillation residues originating, on the one hand, from the manufacture of acrylic acid and, on the other hand, from the manufacture of the esters, the light fraction originating from the dissociation reactions is continuously vaporized during the cracking operation and this light fraction is distilled in order to recover, after condensation, the required products.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: March 31, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Michel Fauconet, Norbert Richard, Patrick Delafin
  • Process for the manufacture of 1,1,1,2-Tetrafluoroethane
    Patent number: 5731481
    Abstract: The invention relates to the manufacture of 1,1,1,2-tetrafluoroethane (F134a) by gas-phase catalytic fluorination of 1-chloro-2,2,2-trifluoroethane (F133a).A mixed catalyst is employed, composed of nickel and chromium oxides, halides and/or oxyhalides deposited on a support consisting of aluminium fluoride or of a mixture of aluminium fluoride and alumina.This mixed catalyst makes it possible to obtain an excellent selectivity for F134a with a high production efficiency.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: March 24, 1998
    Assignee: Societe Atochem
    Inventors: Bernard Cheminal, Eric Lacroix, Andre Lantz