Patents Assigned to Atochem
  • Patent number: 7273512
    Abstract: Process for drying wet F32, which comprises placing a stream of the said F32 in continuous contact with a feed stock of a composition comprising a molecular sieve chosen from a 3A type sieve, at a temperature of between 5 and 78° C. and at a pressure of between 0.5 and 25 atm.
    Type: Grant
    Filed: October 23, 2002
    Date of Patent: September 25, 2007
    Assignee: Elf Atochem S.A.
    Inventor: Rene Bertocchio
  • Patent number: 6911511
    Abstract: The invention relates to a process for the polymerization of at least one monomer which can be polymerized via a radical route, in the presence of a stable free radical and of a polymerization initiator, such that, per 100 mol of monomer, the molar amounts of stable radical (SFR) and of initiator (INIT) are such that [(SFR)×FSFR]/[(INIT)×FINIT]<0.15 and FSFR×(SFR)<0.2 mol, in which FSFR represents the functionality of the stable free radical and FINIT represents the functionality of the initiator. The process according to the invention has advantageous kinetics, allows the production of grafted or block copolymers and can be carried out in an extruder.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: June 28, 2005
    Assignee: Elf Atochem S.A.
    Inventor: Denis Bertin
  • Patent number: 6875499
    Abstract: A thermoplastic material composite panel, comprising a transparent thermoplastic base layer, light conducting, having a thickness generally in the range 3-40 mm, and a light diffusing layer, having a thickness generally in the range 10-1500 micron, placed on one face of the base layer, said diffusing layer being characterized in that it contains barium sulphate in amount by weight, expressed as per cent ratio on the total weight of the diffusing layer, in the range 0.01-2%, the barium sulphate having average particle sizes in the range 0.1-50 micron, the composite sizes being-greater than or equal to 10 cm.
    Type: Grant
    Filed: January 19, 2000
    Date of Patent: April 5, 2005
    Assignee: Elf Atochem S.A.
    Inventors: Andrea De Toffol, Alberto Luca Stasi
  • Patent number: 6841091
    Abstract: A drying composition according to the invention is composed of a solution of a surface-active agent in a mixture of a fluorinated hydrocarbon and of a polyfluorinated alcohol of formula: Rf—(CH2)n—OH??(I) in which n is equal to 1 or 2 and Rf represents a linear perfluoroalkyl radical containing from 2 to 8 carbon atoms.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: January 11, 2005
    Assignee: Elf Atochem S.A.
    Inventor: Pascal Michaud
  • Patent number: 6841612
    Abstract: Composite plastic compositions based on the dispersion of selected cross-linked polymers in certain thermoplastic matrices are disclosed. The composite compositions are readily formed and processed by thermal extrusion processes versus conventional casting processes. Preferred composite plastics compositions based on cross-linked poly(alkyl (meth)acrylate) polymers and modified poly(alkyl (meth)acrylate) thermoplastics are especially useful in the preparation of synthetic architectural materials having a mineral-like appearance, such as that of granite.
    Type: Grant
    Filed: June 15, 1998
    Date of Patent: January 11, 2005
    Assignee: Elf Atochem S.A.
    Inventors: Shijun Yang, Paul Joseph Keating
  • Patent number: 6825301
    Abstract: The invention concerns a water-in-oil polymer emulsion containing in an organic and continuous phase practically non-miscible in water, finely comminuted water soluble polymers or capable of being swollen in water, a water-in-oil emulsifying agent and optionally wetting agents. The invention also concerns a method for preparing said emulsion. More particularly, it concerns a method for invert emulsion in the presence of one or several initiators belonging a specific family of azacarboxylic acid esters.
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: November 30, 2004
    Assignee: ATOFINA, Elf Atochem, S.A.
    Inventors: Martine Cerf, Karine Triballier, Françoise Benard
  • Patent number: 6780946
    Abstract: Activator solid support for metallocenes as catalysts in the polymerization of olefins, characterized in that it consists of a group of support particles for a solid catalytic component, which are formed from at least one porous mineral oxide, the said particles having been modified in order to carry, on the surface, aluminum and/or magnesium Lewis-acid sites of formula: groups coming from a functionalization agent having reacted with —OH radicals carried by the base particles of the support, the functionalization reaction having been followed by a fluorination reaction. The catalytic system according to the invention comprises (a) a metallocene catalyst, which has, if required, been subjected to a prealkylation treatment; (b) a cocatalyst; and (c) an activator solid support for metallocene, as defined above, it being possible for the cocatalyst (b) to be absent if the metallocene catalyst (a) has been prealkylated.
    Type: Grant
    Filed: April 1, 2003
    Date of Patent: August 24, 2004
    Assignee: Elf Atochem S.A.
    Inventors: Thierry Saudemont, Roger Spitz, Jean-Pierre Broyer, Jean Malinge, Nathalie Verdel
  • Patent number: 6743951
    Abstract: A composition based on dimethyl disulphide (DMDS) with a masked smell according to the invention comprises, by weight, at least 95% of DMDS, less than 500 ppm of methyl mercaptan, less than 100 ppm of dimethyl sulphide and up to 1% of at least one odor-masking agent.
    Type: Grant
    Filed: January 14, 2002
    Date of Patent: June 1, 2004
    Assignee: Elf Atochem S.A.
    Inventor: Georges Fremy
  • Patent number: 6723779
    Abstract: A latex which forms a film by evaporation at a temperature of less than 40° C. is based on hydrophobic polymer particles having a core/shell structure. The particles consist of 70 to 90% by weight of at least one polymer with a soft character having a glass transition temperature of less than 20° C. forming the core, and 10 to 30% by weight of at least one polymer with a hard character having a glass transition temperature of greater than 50° C. forming the shell. When applied to any surface and after drying at low temperature, the latex, without the use of any coalescents or volatile organic compounds, provides a continuous film which is homogeneous, has no surface tack and has good mechanical integrity.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: April 20, 2004
    Assignee: Elf Atochem S.A.
    Inventors: Xavier Drujon, Pascale Fabre, Ludwik Leibler, Gilles Meunier, Fabrice Domingues Dos Santos
  • Patent number: 6660191
    Abstract: Bifunctional primer naphthalene compounds having the formula: wherein M″ is an alkali metal, preferably sodium or lithium, and R1 and R2 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: February 5, 1998
    Date of Patent: December 9, 2003
    Assignee: Elf Atochem S.A.
    Inventors: Turgut Nugay, Gérard Riess
  • Patent number: 6649560
    Abstract: Catalysts which are useful in the fluorination of halogenated hydrocarbons by HF in the gas phase are obtained by simple impregnation of a bulk chromium oxide with a solution of a nickel derivative, the chromium oxide used exhibiting a BET specific surface of greater than 150 m2/g and a pore volume of greater than 0.15 ml/g.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: November 18, 2003
    Assignee: Elf Atochem
    Inventors: Eric Lacroix, Jean-Pierre Schirmann
  • Patent number: 6641791
    Abstract: The invention relates to the preparation of BF3 and H2SO4 of commercial grade from boron trifluoride hydrate effluents containing organic impurities. The process consists essentially in reacting the said effluent with oleum, in recovering the gaseous boron trifluoride thereby liberated and in subjecting the sulphuric acid by-product to treatment with hydrogen peroxide and to purging with air.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: November 4, 2003
    Assignee: Elf Atochem
    Inventors: Jean-Paul Chalieux, Christian Pralus
  • Patent number: 6639110
    Abstract: A composition based on dimethyl disulphide (DMDS) with a masked smell according to the invention comprises, by weight, at least 95% of DMDS, less than 500 ppm of methyl mercaptan, less than 100 ppm of dimethyl sulphide and up to 1% of at least one odor-masking agent.
    Type: Grant
    Filed: January 14, 2002
    Date of Patent: October 28, 2003
    Assignee: Elf Atochem, S.A.
    Inventor: Georges Fremy
  • Patent number: 6605265
    Abstract: Azines, e.g., ketazines, are continuously produced by (i) establishing a loop having an azine reaction medium circulating therein, such loop including an azine reaction zone, means for separating azine final product from the circulating reaction medium, means for heating the reaction medium and for purging water therefrom, and means for recycling heated and purged reaction medium to the azine reaction zone, (ii) introducing hydrogen peroxide, ammonia and a carbonyl compound into the circulating reaction medium in the azine reaction zone, (iii) withdrawing azine final product thus formed from the circulating reaction medium. downstream of the azine reaction zone, (iii) thereafter purging water from the circulating reaction medium to maintain the volume thereof essentially constant, (iv) heating the circulating reaction medium to a temperature of at least 130° C.
    Type: Grant
    Filed: March 25, 1994
    Date of Patent: August 12, 2003
    Assignee: Atochem
    Inventors: Jean-Pierre Schirmann, Jean-Pierre Pleuvry, Pierre Tellier
  • Patent number: 6605743
    Abstract: The invention relates to a continuous process for the preparation of pivaloyl chloride and of aroyl chloride, in particular of benzoyl chloride, which consists in reacting pivalic acid with a trichloromethylated aromatic compound in the presence of a catalyst at a temperature of between 60° C. and 180° C. under reduced pressure. The products formed are continuously removed from the reaction region, the hydrogen chloride formed being treated in a washing region in which a trichloromethylated compound moves countercurrentwise.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: August 12, 2003
    Assignee: Elf Atochem S.A.
    Inventors: Christophe Ruppin, Philippe Corbiere
  • Patent number: 6605561
    Abstract: Activator solid support for metallocenes as catalysts in the polymerization of olefins, characterized in that it consists of a group of support particles for a solid catalytic component, which are formed from at least one porous mineral oxide, the said particles having been modified in order to carry, on the surface, aluminium and/or magnesium Lewis-acid sites of formula: or —Mg—F, the groups coming from a functionalization agent having reacted with —OH radicals carried by the base particles of the support, the functionalization reaction having been followed by a fluorination reaction. The catalytic system according to the invention comprises (a) a metallocene catalyst, which has, if required, been subjected to a prealkylation treatment; (b) a cocatalyst; and (c) an activator solid support for metallocene, as defined above, it being possible for the cocatalyst (b) to be absent if the metallocene catalyst (a) has been prealkylated.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: August 12, 2003
    Assignee: Elf Atochem, S.A.
    Inventors: Thierry Saudemont, Roger Spitz, Jean-Pierre Broyer, Jean Malinge, Nathalie Verdel
  • Patent number: 6579419
    Abstract: For the purification of the norbornene obtained by the reaction of dicyclopentadiene or cyclopentadiene and ethylene, the crude reaction mixture containing light impurities having boiling temperatures lower than that of norbornene; medium-heavy impurities having the boiling temperatures between that of norbornene and that of ethylnorbornene; and heavy impurities containing ethylnorbornene and compounds boiling higher than ethylnorbornene, boiling temperatures greater than that ethylnorbornene, a first distillation of the crude reaction mixture is carried out in a tailing column (C1), removing a portion of the heavy impurities and a portion of the medium-heavy impurities; then a second distillation of the crude mixture, thus tailed, is carried out in a topping column (C2), removing the light impurities; and a third distillation of the mixture, thus topped, is subsequently carried out in a tailing column (C3), removing the remainder of the heavy and medium-heavy impurities.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: June 17, 2003
    Assignee: Elf Atochem, S.A.
    Inventors: Roland Kotwica, André Marbach
  • Patent number: 6579943
    Abstract: A method of producing modified polyester moulded articles which is characterized in that, when producing moulded articles from a modified polyester composition comprising a polyester composed of an acid component chiefly consisting of aromatic dicarboxylic acid and glycol component chiefly consisting of aliphatic diol, and a modified polyolefin, there is incorporated an ethylene-acrylate copolymer; together with the moulded articles produced thereby.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: June 17, 2003
    Assignee: Elf Atochem S.A.
    Inventors: K Ishino, Takatoshi Ku-Ratsuji
  • Patent number: 6576705
    Abstract: The objective of the present invention lies in providing a resin composition which enables water vapor permeability to be controlled over a broad range while maintaining a high gas permeability, together with molded articles or packaging materials comprising said composition, in particular a packaging material for foodstuffs like fruit and vegetables. A thermoplastic resin composition which is characterized in that a polymer (A) containing polyether chains as structural units, polyethylene (B) of density as specified in JIS K6760 of less than 0.91 g/cm3 and a compatibilizing agent (C) are blended together in proportions by weight of A/B/C=99.5 to 0.5/0.5 to 99.5/0 to 30 (where A+B+C=100); and molded articles comprising said composition, in particular a packaging material for vegetables and fruit cultivation or foodstuffs storage.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: June 10, 2003
    Assignee: Elf Atochem S.A.
    Inventors: Jerome Maillet, Takatoshi Kuratsuji, Alain Bouilloux, Yves Germain
  • Patent number: 6576342
    Abstract: Multilayered article including a functionalized and vulcanized elastomer adherent by itself to a thermoplastic chosen from polyamides, PBT, mixtures containing polyvinylidene fluoride and ethylene/vinyl alcohol and ethylene/tetrafluoroethylene copolymers. Composite tubular article made up of an outer sheath of vulcanized elastomer adherent to a hydrocarbon-barrier thermoplastic or associated with an inner layer for producing imperviousness.
    Type: Grant
    Filed: October 19, 1995
    Date of Patent: June 10, 2003
    Assignee: Elf Atochem S.A.
    Inventors: Martine Cerf, Olivier Denizart, Christian Dousson