Patents Assigned to Rhone-Poulenc Specialites Chimiques
  • Patent number: 5376305
    Abstract: Storage-stable sols are comprised of a colloidal dispersion of Ce (IV) values in an aqueous medium, and optionally colloidal particulates of a cation of a metal M, with said colloidal dispersion being "supersaturated" in [OH.sup.- ] ions.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: December 27, 1994
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Jean-Yves Chane-Ching, Jean-Yves Dumousseau, Patrick Dupuis
  • Patent number: 5344588
    Abstract: A novel cerium (IV) compound, well adopted for the production of aqueous colloidal sols therefrom, has the general formula (I):Ce (Me).sub.x (OH).sub.y (NO.sub.3).sub.z (I)wherein M is an alkali metal an ammonium radical; x ranges from 0.01 to 0.2; y is a number such that y=4-z+x; and z ranges from 0.4 to 0.7.
    Type: Grant
    Filed: August 21, 1991
    Date of Patent: September 6, 1994
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventor: Jean-Yves Chane-Ching
  • Patent number: 5190625
    Abstract: The rare earth metals, or alloys thereof, are prepared in high yields in a specially designed electrolytic cell, by electrolyzing a melt comprising (i) at least one chloride of at least one rare earth, or at least one such chloride and at least one chloride of at least one transition metal, (ii) at least one alkali or alkaline earth metal chloride, and (iii) at least one alkali or alkaline earth metal fluoride.
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: March 2, 1993
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Francoise Seon, Ghislaine Barthole
  • Patent number: 5066420
    Abstract: Silica colloids having a spherical form, a mean diameter of between about 10 and 100 nm and a polydispersity index between about 1 and 4. A process for making silica colloids is also provided comprising a) forming a reaction medium by simultaneously adding an acidifying agent and an alkaline silicate solution to a reaction vessel, b) reacting the acidifying agent and alkaline silicate solution, and c) maintaining a constant volume of the reaction medium by drawing off the reaction medium.
    Type: Grant
    Filed: August 5, 1987
    Date of Patent: November 19, 1991
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventor: Yvonick Chevallier
  • Patent number: 4977213
    Abstract: Polyamide-based molding compositions having enhanced flexibility and resilience, especially at low temperatures, are prepared from (1) semirigid copolyamides prepared from fatty acid dimers, (2) elastomers containing moieties compatible or reactive with such copolyamides (1) and comprising olefinic copolymers bearing carboxyl and/or carboxylate groups, copolyester-amides, polyurethanes, organopolysiloxane and polyurethane block copolymers, and copolymers produced from a latex which comprises suitable functional groups, and, optionally, (3) conventional polyamides.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: December 11, 1990
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Bruno Giroud-Abel, Jean Goletto
  • Patent number: 4976939
    Abstract: Rare earth hydroxides are recovered from the rare earth ores, e.g., monazite, xenotime and/or bastnasite, by treating the ore with an aqueous solution of an alkali metal hydroxide, under agitation and essentially constant pressure, at a temperature of from about 100.degree. to 220.degree. C., and wherein the ratio by weight of alkali metal hydroxide/ore ranges from about 1.4 to 0.5, e.g., a weight ratio of sodium hydroxide/ore of from about 1 to 0.5, or a weight ratio of potassium hydroxide/ore of from about 1.4 to 0.7.
    Type: Grant
    Filed: May 3, 1990
    Date of Patent: December 11, 1990
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Frederic Fabre, Jean-Paul Tognet, Claude Magnier
  • Patent number: 4963594
    Abstract: Vinyl chloride based polymers are heat/color stabilized by formulating therewith a stabilizing amount of (i) at least one organozinc derivative, (ii) at least one organic derivative of a metal from Group IIa of the Periodic Table, and (iii) at least one thiomalic acid diester.
    Type: Grant
    Filed: July 21, 1989
    Date of Patent: October 16, 1990
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventor: Michel Gay
  • Patent number: 4940685
    Abstract: A ceric oxide composition, the specific surface of which remains essentially stable at elevated temperatures and which is thus well adopted for purposes of catalysis, is comprised of a plurality of solid, porous, finely divided ceric oxide particulates, said ceric oxide particulates advantageously having an effective amount of at least one oxide of another metallic element A intimately dispersed therein as to essentially prevent the coalescence of the micropores thereof.
    Type: Grant
    Filed: July 3, 1986
    Date of Patent: July 10, 1990
    Assignee: Rhone-Poulenc Specialites Chimique
    Inventors: Guy-Noel Sauvion, Jack Caillod, Claire Gourlaouen
  • Patent number: 4938983
    Abstract: Suspensions of solid particulates in aqueous media, useful, e.g., as thickeners in a wide variety of foodstuff and industrial applications, are sedimentations stabilized by incorporating therein a stabilizing amount of xanthan/carob gum, optionally starch admixture.
    Type: Grant
    Filed: June 10, 1987
    Date of Patent: July 3, 1990
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Michel Peignier, Marie-Madeleine Besnard
  • Patent number: 4929460
    Abstract: Foodstuff items to be cooked, e.g., meats and boned poultry, are bound or wrapped in fibrous silicone elastomeric bindings, e.g., ties or nets, to maintain structural integrity during cooking. After cooking, such bindings have not decomposed, are not adhered to the foodstuff item, and have retained their elasticity.
    Type: Grant
    Filed: October 3, 1989
    Date of Patent: May 29, 1990
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Robert Lagarde, Daniel Ariagno, Jacques Nys
  • Patent number: 4915174
    Abstract: The invention provides concentrated suspensions of high molecular weight water soluble polymers comprising a high molecular weight water soluble polymer, a nonpolymer solvating organic diluent, a swelling agent and a low molecular weight polymer adjuvant, soluble in water and having functional carboxylic acid (or salt) groups thereon and methods for preparing same and the use thereof in the preparation of dilute aqueous thickening solutions suitable for use in various industrial applications, including the petroleum industry and, in particular, the secondary recovery of petroleum from underground well deposits in oil fields.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: April 10, 1990
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventor: Gerard Berrod
  • Patent number: 4894335
    Abstract: Stable oil-in-water emulsions are prepared containing a relatively high concentration of from 8 to 60% by weight of a heteropolysaccharide bipolymer, e.g., xanthan gum preferably, the emulsions contain greater than 15 up to 60% biopolymer, 40 to 99 parts of an aqueous phase containing 10 to 60% by weight biopolymer and 40% to 90% by weight water, 1 to 60 parts oil and 1 to 40% with respect to the aqueous phase and oil of a surface active agent. The emulsions are prepared by combining powdered biopolymer with water, oil and surfactant or by concentrating an oil-in-water emulsion containing the biopolymer such as by ultrafiltration. A fermentation wort containing the biopolymer may be used in preparing the emulsion.
    Type: Grant
    Filed: March 16, 1987
    Date of Patent: January 16, 1990
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Michel Peignier, Michel Garcia, Alain Senechal, Pierre Gagne, Dominique Lespinasse, Jean-Bernard Chaux
  • Patent number: 4891199
    Abstract: Zeolites of type ZSM-5, well suited as absorbents/catalysts, are facilely prepared by (i) intimately admixing a source of alumina with a source of silica, in aqueous reaction medium having a pH ranging from 1 to 7 and wherein the molar ratio SiO.sub.2 /Al.sub.2 O.sub.3 ranges from 5 to 100, (ii) adding a source of alkali metal oxide to the reaction mixture resulting from said stage (i), said combined reaction mixture having a pH ranging from 8 to 12, and thence (iii) crystallizing a zeolite of type ZSM-5 therefrom.
    Type: Grant
    Filed: December 22, 1986
    Date of Patent: January 2, 1990
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Bertrand Latourrette, Claude Magnier
  • Patent number: 4886868
    Abstract: Novel N-(meth)allyloxyphenylmaleimides are prepolymerized with at least one bis-imide and formulated, together with at least one imidazole compound, into thermosetting compositions useful for the production of a wide variety of shaped articles having improved mechanical properties.
    Type: Grant
    Filed: June 24, 1988
    Date of Patent: December 12, 1989
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventor: Michel Rakoutz, deceased
  • Patent number: 4883904
    Abstract: A process for the preparation of ethyltrifluoroacetoacetate is provided. In this first step, ethyltrifluoroacetate is condensed with ethyl acetate in the presence of sodium ethoxide in cyclohexane. In a second step, the condensation product is neutralized with a protonic acid, such as formic acid, to release an enol. In the third step, the ethyltrifluoroacetoacetate obtained is separated by distillation. The ethyltrifluoroacetoacetate is used as an intermediate in syntheses in the pharmaceutical or plant protection industry.
    Type: Grant
    Filed: June 12, 1986
    Date of Patent: November 28, 1989
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Louis Amiet, BErnard Langlois
  • Patent number: 4876396
    Abstract: Phenolic compounds and mixtures thereof, e.g., admixture of 2,4-dichlorophenol and 2,6-dichlorophenol, are selectively chlorinated at a position ortho to a hydroxyl function thereof, by reacting such phenolic compound with gaseous chlorine, in a molten reaction medium, in the presence of a catalytically effective amount of a primary, secondary or tertiary amine.
    Type: Grant
    Filed: July 28, 1987
    Date of Patent: October 24, 1989
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Jean-Claude LeBlanc, Serge Ratton
  • Patent number: 4874594
    Abstract: Precipitation silicas, in the form of aggregates as shown in FIG. 1, having a mean projected area of the aggregates which is higher than about 8,000 nm.sup.2 and preferably is higher than about 15,000 nm.sup.2. The present invention also concerns a process for the production of precipitation silica by maintaining a constant-volume reaction medium to provide suitable colloids of silica, reacting the colloids with an electrolyte and consolidating the resulting product by the addition of a solution of silicate and an acidifying agent to obtain a precipitation silica.
    Type: Grant
    Filed: August 5, 1987
    Date of Patent: October 17, 1989
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventor: Yvonick Chevallier
  • Patent number: 4873323
    Abstract: Novel deacetylated polysaccharide biopolymers having improved viscosity/filtrability/injectability, well adopted for the secondary and tertiary recovery of oil deposits, are conveniently prepared by (i) acidifying an aqueous polysaccharide composition, e.g., a carbohydrate fermentation broth, with nitric acid to a pH of from about 2 to 0.1, (ii) heat-treating said acidified composition at a temperature of from about 50.degree. to 100.degree. C. for from about 5 to 60 minutes, and (iii) cooling said heat-treated composition and adjusting the pH thereof to a value of from about 5 to 7.
    Type: Grant
    Filed: August 14, 1986
    Date of Patent: October 10, 1989
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Patrick Cros, Robert Pipon
  • Patent number: 4867972
    Abstract: Novel surface-active, storage-stable compositons well adopted for the formulation of a variety of active agents, e.g., biocides, and the conversion thereof into stable, hmogenous liquid suspensions, are comprised of at least one first polyolefinic copolymeric surface-active agent (a) and at least one second mixed sulfate and/or phosphate ester surface-active agent (b).
    Type: Grant
    Filed: May 6, 1986
    Date of Patent: September 19, 1989
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Yvette Girardeau, Patrick Gaudinet, Sylvie Queuche
  • Patent number: 4866149
    Abstract: A process for treating a polysilazane, characterized in that a polysilazane possessing on average at least two, and preferably at least three, hydrocarbon groups having aliphatic unsaturation per molecule is treated catalytically in the presence of a catalytically efficient amount of a co-ordination catalyst. The polysilazanes treated in this manner possess high thermal resistance and can be used, in particular, as precursors of ceramic products, with a high yield of inorganic product.
    Type: Grant
    Filed: November 28, 1986
    Date of Patent: September 12, 1989
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Jean-Jacque Lebrun, Hugues Porte