Patents Assigned to Elf Atochem S.A.
  • Heat-sealable and peelable film for polystyrene containers and process for sealing by means of said film
    Patent number: 5620802
    Abstract: The present invention relates to a heat-sealable and peelable film for polystyrene containers, consisting of at least one thin film comprising a mixture (a) of polystyrene and (b) of one or more copolymer(s) of ethylene and of acrylic derivatives.It also relates to a process for sealing a polystyrene container by means of said film and to the heat-sealed polystyrene container thus obtained.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: April 15, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Jean-Fran.cedilla.ois Arsac, Catherine Bonabal, Betty Laurent
  • Process for the preparation of alkyl halodifluoroacetates
    Patent number: 5619023
    Abstract: For the preparation of alkyl halodifluoroacetates, a 1,1-difluorotetrahaloethane is reacted with an alcohol in the presence of air and/or oxygen and a free-radical initiator, such as for example an azo compound, e.g., azobis(isobutyronitrile).
    Type: Grant
    Filed: December 5, 1995
    Date of Patent: April 8, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Gilles Drivon, Jean-Philippe Gillet, Christophe Ruppin, Alain Wattier
  • Process for the manufacture of 1,1,1,2-tetrafluoro-2-chloroethane and of pentafluoroethane
    Patent number: 5616820
    Abstract: The invention relates to a process for the manufacture of 1,1,1,2-tetrafluoro-2-chloroethane and of pentafluoroethane.The process, which consists of the gas phase catalytic fluorination of at least one pentahaloethane of formula C.sub.2 HX.sub.2-n F.sub.3+n in which X denotes a chlorine or bromine atom and n the number 0 or 1 by means of hydrofluoric acid, is characterized in that there is used a mixed catalyst composed of oxides, halides and/or oxyhalides of nickel and chromium deposited on a support consisting of aluminium fluoride or a mixture of aluminium fluoride and alumina.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: April 1, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Bernard Cheminal, Eric Lacroix, Andr e Lantz
  • Catalyst for the polymerization of diolefins, method for its preparation, and its use for the preparation of polymers
    Patent number: 5612427
    Abstract: A supported solid catalyst which can be used for the polymerization and clymerization of conjugated dienes having as its basis the reaction product of:A) a solid MgCl.sub.2 support,B) an ether, preferably THF, as swelling agent for the support,C) a metal salt selected from among metals having an atomic number of between 57 and 71 or 92 in the periodic table of elements and, if the metal salt is not a halide,D) a halogenation agent selected from the group consisting of a halogenated compound of aluminum and a halogenated compound not containing aluminum, the reaction solid being free from the swelling agent, plusE) an organic derivative of aluminum which is obligatory when the halogenation agent is not a halogenated compound of aluminum and optional when the halogenation agent is a derivative of aluminum.Also, a method of preparing this catalyst.
    Type: Grant
    Filed: June 29, 1995
    Date of Patent: March 18, 1997
    Assignees: Campagnie Generale des Establissements Michelin - Michelin & Cie, Elf Atochem S.A.
    Inventors: Pierre Robert, Roger Spitz
  • Process for the preparation of alkylimidazolidone (meth) acrylates
    Patent number: 5610313
    Abstract: A compound (I) is prepared by reacting at least one (meth)acrylate (II) with a heterocyclic alcohol (III), in the presence of a catalyst consisting of a mixture formed (a) of at least one magnesium alkoxide and (b) of a component chosen from the chelates of calcium with 1,3-dicarbonyl compounds, dialkyltin oxides, dialkyltin alkoxides and dialkyltin diesters. ##STR1## R=C.sub.1 -C.sub.4 alkyl. R.sup.1 =H, CH.sub.3 ; A, B=straight or branched C.sub.2 -C.sub.5 hydrocarbon chain; R.sup.2 =C.sub.1 -C.sub.4 alkyl.
    Type: Grant
    Filed: November 17, 1995
    Date of Patent: March 11, 1997
    Assignee: ELF Atochem S.A.
    Inventors: Alain Riondel, Gilles Herbst, Andr e Levray
  • Catalyst for the polymerization of diolefins, method for its preparation, and its use for the preparation of polymers
    Patent number: 5610114
    Abstract: A supported solid catalyst which can be used for the polymerization and copolymerization of conjugated dienes having as its basis the reaction product of:A) a solid MgCl.sub.2 support,B) an ether, preferably THF, as swelling agent for the support,C) a metal salt selected from among metals having an atomic number of between 57 and 71 or 92 in the periodic table of elements and, if the metal salt is not a halide,D) a halogenation agent selected from the group consisting of a halogenated compound of aluminum and a halogenated compound not containing aluminum, the reaction solid being free from the swelling agent, plusE) an organic derivative of aluminum which is obligatory when the halogenation agent is not a halogenated compound of aluminum and optional when the halogenation agent is a derivative of aluminum.Also, a method of preparing this catalyst.
    Type: Grant
    Filed: August 2, 1995
    Date of Patent: March 11, 1997
    Assignees: Compagnie Generale Des Estab. Michelin-Michelin & Cie, Elf Atochem S.A.
    Inventors: Pierre Robert, Roger Spitz
  • Process for the purification of difluoromethane
    Patent number: 5608129
    Abstract: To remove the traces of chlorofluoromethane present in a difluoromethane, the difluoromethane to be purified is passed over a 13X molecular sieve at a temperature of at least 60.degree. C.The sieve can be regenerated by washing with the aid of a solution of sodium or potassium carbonate and heating to high temperature under inert atmosphere or in vacuum.
    Type: Grant
    Filed: September 26, 1995
    Date of Patent: March 4, 1997
    Assignee: Elf Atochem S.A.
    Inventor: Rene Bertocchio
  • Preparation of alkanesulphonic acids by photooxidation of sulpher-containing derivatives
    Patent number: 5608103
    Abstract: The invention relates to the preparation of alkanesulphonic acids by photooxidation of sulphur-containing derivatives (thiols, sulphides, disulphides).The operation is carried out in solution in aqueous or alcoholic acetonitrile, with a light source irradiating between 200 and 400 nm.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: March 4, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Evelyne Banchereau, Sylvie Lacombe, Jean Ollivier
  • Process for the manufacture of butyl acrylate by direct esterification
    Patent number: 5606102
    Abstract: In this esterification, catalysed by H.sub.2 SO.sub.4, the crude reaction mixture comprising ester, butanol, acrylic acid, BuSO.sub.4 H and traces of H.sub.2 SO.sub.4 is obtained; BuSO.sub.4 H is hydrolysed (in R2) to H.sub.2 SO.sub.4 using pure water or water generated during the reaction; after hydrolysis, the medium is separated by settling (in D2) into an organic phase containing ester, butanol and part of the unconverted acid; and an aqueous phase containing H.sub.2 SO.sub.
    Type: Grant
    Filed: July 27, 1995
    Date of Patent: February 25, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Michel Fauconet, Christian Lacroix, Nathalie Hess, Jacqueline Bessalem
  • Flexible metal pipes with a shrinkable polymer sheath, a process for their fabrication, and their utilization as flexible tubular conduits
    Patent number: 5601893
    Abstract: This invention relates to a flexible metal pipe covered with an impermeable sheath of a shrinkable, preferably semicrystalline polymer or polymers, characterized in that it incorporates between the shrinkable polymer sheath and the metal pipe an intermediate elastomer layer (8), optionally vulcanized or reticulated, and/or a TPE in the form of a continuous tubular sleeve (FIG. 3) or of a tape (FIG. 4 to 6). Sheathed pipes of this type are particularly suitable for flexible pipelines, optionally with suitable supports, for carrying oil and gas.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: February 11, 1997
    Assignees: Elf Atochem S.A., Coflexip S.A.
    Inventors: Albert Strassel, Jean Hardy
  • Magnesium chloride particulates having unique morphology and olefin polymerization catalysts supported thereon
    Patent number: 5599760
    Abstract: Crystalline MgCl.sub.2 particulates, exhibiting the morphology of substantially regular polyhedra having an even number of from 10 to 18 face surfaces, are well suited as support substrate for olefin polymerization catalysts.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: February 4, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Claude Brun, Jean-Michel Brusson, Laurent Duranel, Roger Spitz
  • Catalytic preparation of sec-butyl acrylate
    Patent number: 5596126
    Abstract: For preparing sec-butyl acrylate, acrylic acid is reacted with 1-butene in the presence of a zirconium-based solid superacid as the catalyst, for example a calcined reaction product of 10-15 parts by weight of ammonium sulphate and 100 parts by weight of zirconium hydroxide.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: January 21, 1997
    Assignee: Elf Atochem S.A.
    Inventor: Alain Riondel
  • Heat transfer fluids comprising mono- and bis(methylbenzyl)xylene isomers
    Patent number: 5593613
    Abstract: Unique heat transfer fluid media include (methylbenzyl)xylene or a composition comprising admixture of the compounds (A): ##STR1## in which n.sub.1 +n.sub.2 =0 or 1, wherein a fraction of such compounds (A) n.sub.1 +n.sub.2 =0 and further wherein another fraction of such compounds (A) n.sub.1 +n.sub.
    Type: Grant
    Filed: August 3, 1994
    Date of Patent: January 14, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Raymond Commandeur, Jean-Pierre Sarron
  • (Meth) acrylic compounds, process for their preparation and their application to the synthesis of new polymers
    Patent number: 5587499
    Abstract: These compounds are denoted by the following formula (I): ##STR1## in which: Z denotes H or a linear or branched alkyl radical,X denotes O or S,each of A and B independently denotes an alkylene radical, it being possible for this radical to be substituted,R denotes H or an alkali metal, or else a linear or branched alkyl radical,x has the value of 0 or 1, andy has the value of 0, 1 or 2,the radical A not existing if x and y are both equal to 0, X being incapable of denoting O when R=alkyl and when R=H with x=y=0, and B being incapable of denoting optionally substituted methylene when X=S, x=y=0 and R=alkyl.According to the invention, different simple and efficient processes are proposed for preparing these new compounds, which can be applied to the preparation of new polymers and copolymers.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: December 24, 1996
    Assignee: ELF Atochem S.A.
    Inventors: Mich ele Curci, Jean-Luc Mieloszynski, Daniel Paquer
  • Process for the manufacture of biacetyl-free methyl methacrylate
    Patent number: 5585514
    Abstract: A process for producing methyl methacrylate comprises: (a) reacting acetone cyanohydrin with sulphuric acid or an oleum, in order to obtain methacrylamide; (b) reacting the methacrylamide thus obtained either directly, or after it has been isolated, with methanol in the presence of water; (c) separating the methyl methacrylate from the sulphuric acid, ammonium sulphate and water mixture by distillation; (d) removing the unreacted methanol by liquid-liquid extraction; (e) distilling the washed methyl methacrylate in two stages: (e1) firstly, in order to remove the remaining traces of water, of methanol and of low-boiling-point impurities; then (e2) in order to separate the pure methyl methacrylate from the high- boiling-point impurities.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: December 17, 1996
    Assignee: Elf Atochem S.A.
    Inventors: Jean-Fran.cedilla.ois Croizy, Marc Esch
  • Article for gliding on water or snow
    Patent number: 5582918
    Abstract: Copolymers of ethylene, optionally substituted by a halogen atom, by two halogen atoms carried by the same carbon atom, or by a phenyl group, and of fluorinated (meth)acrylates of formula: ##STR1## in which: R is selected from hydrogen and methyl, andn is an integer greater than or equal to 1.Application of these copolymers to form, in particular, surfaces for gliding on snow or water.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: December 10, 1996
    Assignee: ELF Atochem S.A.
    Inventor: Ren e Gouard eres
  • Thermoplastic resins resulting from grafting unsaturated monomers to chlorinated polyolefins, and process for the production thereof
    Patent number: 5580933
    Abstract: Grafting chlorinated polyolefins with unsaturated monomers (acrylic, styrene, vinyl) in the presence of AIBN used as a free radical-producing trigger yields resins that can be used as solutions, dilutable in water as required, in order to produce films that are hard, transparent, glossy, and adhesive and which are prized, in particular, in the manufacture of compositions used for pigmented or unpigmented coatings such as paints, inks, and adhesive primary coatings.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 3, 1996
    Assignee: Elf Atochem S.A.
    Inventors: Christophe Verge, Alain Boone
  • Polymers comprising both polyamide-diacid/polyetherdiol blocks and polyamide-diacid/polyetherdiamine blocks, and their preparation
    Patent number: 5574128
    Abstract: Polyetheresteramides, characterized in that they comprise both of the following repeating entities: ##STR1## in which X represents the residue of a polyamide-diacid oligomer with an Mn of between 300 and 8000, Y represents the residue of a polyetherdiol with an Mn of between 200 and 5000, and Z represents the residue of a polyetherdiamine with an Mn of between 200 and 5000, wherein the proportion by mass of the entities Z resulting from the condensation of the polyetherdiamine with respect to the total amount of the entities resulting from the polyetherdiol and polyetherdiamine, i.e. Z/(Z+Y), is between 1 and 50%. The polyetheresteramides according to the invention can be used as is and are suitable for the production of mouldings, extrudates, films, sheaths, or composite materials such as multi-layer film. They can also be mixed with other polymers and in particular with polyamides.
    Type: Grant
    Filed: August 10, 1994
    Date of Patent: November 12, 1996
    Assignee: Elf Atochem S.A.
    Inventors: Didier Judas, Jean-Marc Sage
  • Superabsorbent polymers
    Patent number: 5563218
    Abstract: Superabsorbent, high gel strength/short gel time acrylic polymers, well suited for the production of items of feminine hygiene/adult incontinence, are prepared by (a) inversely suspending an aqueous acrylic monomer phase in an organic solvent in the presence of an emulsifying agent having an HLB of from 8 to 12, the aqueous monomer phase also comprising a crosslinking agent therefor, (b) polymerizing the inverse suspension of acrylic monomer into a polymer gel, (c) absorbing a second charge of acrylic monomer into the polymer gel thus attained, the ratio of the amount of the second monomer charge to the amount of monomer in the beginning aqueous phase ranging from 1 to 1.2, (d) introducing a surfactant having an HLB of from 2 to 5 into the medium of polymerization, and (e) polymerizing the second monomer charge within the polymer gel.
    Type: Grant
    Filed: August 25, 1994
    Date of Patent: October 8, 1996
    Assignee: Elf Atochem S.A.
    Inventors: Shu R. Rebre, Christian Collette, Thierry Guerin
  • Anionically copolymerized living random (meth)acrylic copolymers and copolymers prepared therefrom
    Patent number: 5561207
    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: February 16, 1995
    Date of Patent: October 1, 1996
    Assignee: Elf Atochem S.A.
    Inventors: Jin-shan Wang, Philippe Bayard, Philippe Teyssie, Bruno Vuillemin, Philippe Heim