Patents by Inventor Lotfi Hedhli

Lotfi Hedhli has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9447256
    Abstract: The invention relates to methods of polymerizing fluoromonomers using non-fluorinated surfactants, in particular to emulsion polymerization method for producing fluoropolymer latex. Specifically, the method of polymerization uses one or more alkyl sulfate surfactants.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: September 20, 2016
    Assignee: Arkema Inc.
    Inventors: Ramin Amin-Sanayei, Lotfi Hedhli, Mehdi Durali, Roice A. Wille
  • Patent number: 9434837
    Abstract: A fluoropolymer latex is obtained by emulsion polymerization of one or more fluoromonomers in the presence of one or more acid-functionalized monomers such as vinyl sulfonic acid or a salt thereof. A fluorosurfactant need not be present.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: September 6, 2016
    Assignee: Arkema Inc.
    Inventors: Mehdi Durali, Lotfi Hedhli
  • Publication number: 20160008772
    Abstract: The invention relates to membranes formed from long chain branched fluoropolymers, and especially long chain branched homopolymers and copolymers of polyvinylidene fluoride such as KYNAR resins. The novel membranes retain all the advantages of a fluoropolymer membrane (excellent chemical resistance especially to strong acids and oxidizing agents, and good mechanical strength), and additionally offer improved permeability, improved strain hardening, and even better resistance to caustic attacks. The improvements are believed to be related to an improvement to the microstructure of the membranes, producing a more open structure due to the long chain branched fluoropolymers. Further improvements in the mechanical properties of the membranes can be induced by strain hardening.
    Type: Application
    Filed: February 27, 2014
    Publication date: January 14, 2016
    Inventors: Walter P. Kosar, Lotfi HEDHLI, Roderick REBER
  • Patent number: 8846359
    Abstract: A method of regenerating an enzymatic catalyst arranged in a reactor includes a mineral support based on metal oxide and at least one enzyme, wherein it contains at least one step of detachment of the spent enzymes by solvation by scavenging of the catalyst using at least one ionic surfactant, and at least one step of re-attachment of active enzymes by scavenging of the purified support with at least one solution of active enzymes, the two steps being performed in situ within the reactor.
    Type: Grant
    Filed: September 20, 2012
    Date of Patent: September 30, 2014
    Assignee: Total Marketing Services
    Inventors: Daniel Thomas, Sylviane Pulvin, Lotfi Hedhli, Samuel Djelassi
  • Publication number: 20140179868
    Abstract: The invention relates to methods of polymerizing fluoromonomers using non-fluorinated surfactants, in particular to emulsion polymerization method for producing fluoropolymer latex. Specifically, the method of polymerization uses one or more alkyl sulfate surfactants.
    Type: Application
    Filed: July 25, 2012
    Publication date: June 26, 2014
    Inventors: Ramin Amin-Sanayei, Lotfi Hedhli, mehdi Durali, Roice A. Wille
  • Patent number: 8697822
    Abstract: The present invention relates to a method for the polymerization in an aqueous medium of monomers, and especially of fluoromonomers, using non-fluorinated surfactants; and the fluoropolymers formed therefrom. Specifically, the method of the polymerization uses one or more non-fluorinated surfactants selected from the group consisting of polyvinylphosphonic acid, polyacrylic acids, polyvinyl sulfonic acid, and salts thereof. Additionally, the use of polyvinylphosphonic acid, polyacrylic acids, polyvinyl sulfonic acid as surfactants in aqueous free radical polymerization is also novel.
    Type: Grant
    Filed: June 26, 2006
    Date of Patent: April 15, 2014
    Assignee: Arkema Inc.
    Inventors: Mehdi Durali, Lotfi Hedhli, Ramin Amin-Sanayei
  • Patent number: 8557938
    Abstract: The invention relates to the preparation of branched fluoropolymers having long chain branches and little or no gels, by a process involving polymerization at high temperatures using persulfates and optionally multifunctional initiators. The invention also relates to gel-free, branched polymers with strain hardening produced by the process.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: October 15, 2013
    Assignee: Arkema Inc.
    Inventors: Lotfi Hedhli, Nafih Mekhilef
  • Publication number: 20130150519
    Abstract: A fluoropolymer latex is obtained by emulsion polymerization of one or more fluoromonomers in the presence of one or more acid-functionalized monomers such as vinyl sulfonic acid or a salt thereof. A fluorosurfactant need not be present.
    Type: Application
    Filed: August 30, 2011
    Publication date: June 13, 2013
    Applicant: Arkema Inc.
    Inventors: Mehdi Durali, Lotfi Hedhli
  • Publication number: 20130035533
    Abstract: A process is disclosed for reducing the content of polycyclic aromatic hydrocarbons or PAHs in aromatic extracts including oxidizing the PAHs in the presence of a hemoprotein via an oxidizing compound, wherein the aromatic extract is brought into contact with the oxidizing agent in a non-reactive organic solvent, then is brought into contact with the immobilized or supported hemoprotein.
    Type: Application
    Filed: April 7, 2011
    Publication date: February 7, 2013
    Applicant: TOTAL RAFFINAGE MARKETING
    Inventors: Lotfi Hedhli, Samuel Djelassi, Sylviane Pulvin, Daniel Thomas
  • Patent number: 8349954
    Abstract: The present invention relates to a method for the polymerization of fluoromonomers using non-fluorinated polycaprolactone, and to the fluoropolymers formed thereby. Specifically, the method of the polymerization uses one or more polycaprolactone, or salts thereof.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: January 8, 2013
    Assignee: Arkema Inc.
    Inventor: Lotfi Hedhli
  • Patent number: 8124699
    Abstract: The present invention relates to a method for the polymerization of fluoromonomers using non-fluorinated alkyl phosphonate surfactants, and to the fluoropolymers formed thereby. Specifically, the method of the polymerization uses one or more alkyl phosphonic acids or salts thereof.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: February 28, 2012
    Assignee: Arkema Inc.
    Inventors: Mehdi Durali, Lotfi Hedhli, Roice Wille
  • Patent number: 8039160
    Abstract: Multi-layer polyelectrolyte membranes are described wherein at least one of the layers contains at least one acrylic resin or vinyl resin having at least one ionic or ionizable group, and at least one additional polymer. The polymer has small or large domain sizes with respect to the acrylic resin or vinyl resin that is present in one or more layers. The polymer preferably has improved conductivity when formed into a film. The membranes are useful in batteries, fuel cells, and the like.
    Type: Grant
    Filed: July 14, 2004
    Date of Patent: October 18, 2011
    Assignee: Arkema Inc.
    Inventors: Lotfi Hedhli, Isabelle Decker, Patrick M. Piccione, Holger Amort, Scott R. Gaboury, Fabienne Piroux
  • Publication number: 20110118403
    Abstract: The invention relates to aqueous fluoropolymer hybrid compositions made by a seeded emulsion polymerization process, having improved film formation properties. The seed is a fluoropolymer dispersion. At least two different monomer compositions are added sequentially to the seeded dispersion. These monomer compositions preferably include acrylic monomers. The first monomer composition is selected for miscibility with the fluoropolymer dispersion. The second monomer composition is selected to have a glass transition temperature (Tg) of less than 30° C. The final composition can be formulated to make coatings with a minimum film forming temperature (MFFT) of less than 5° C., and a maximum VOC of 50 g/liter. The composition is especially useful for coatings and films.
    Type: Application
    Filed: June 18, 2009
    Publication date: May 19, 2011
    Applicant: Arkema Inc.
    Inventors: Kurt A. Wood, Lotfi Hedhli, Mehdi Durali
  • Publication number: 20110034632
    Abstract: The present invention relates to a method for the polymerization of fluoromonomers using non-fluorinated polycaprolactone, and to the fluoropolymers formed thereby. Specifically, the method of the polymerization uses one or more polycaprolactone, or salts thereof.
    Type: Application
    Filed: April 2, 2009
    Publication date: February 10, 2011
    Applicant: Arkema Inc,
    Inventor: Lotfi Hedhli
  • Patent number: 7803867
    Abstract: The invention relates to an aqueous-based fluoropolymer coating that is especially useful for use over flat or low-slope flexible surfaces, and more specifically for flat or low-slope roofing. The coating can be factory or field applied. The coating offers the advantages of improved durability, lower dirt pick-up, stain resistance, water repellency, increased solar reflectivity duration, and mildew resistance.
    Type: Grant
    Filed: April 13, 2006
    Date of Patent: September 28, 2010
    Assignee: Arkema Inc.
    Inventors: Kevin Hanrahan, Kurt Wood, Lotfi Hedhli, Ravi Gupta, Wayne Skilton
  • Publication number: 20090221776
    Abstract: The present invention relates to a method for the polymerization in an aqueous medium of monomers, and especially of fluoromonomers, using non-fluorinated surfactants; and the fluoropolymers formed therefrom. Specifically, the method of the polymerization uses one or more non-fluorinated surfactants selected from the group consisting of polyvinylphosphonic acid, polyacrylic acids, polyvinyl sulfonic acid, and salts thereof. Additionally, the use of polyvinylphosphonic acid, polyacrylic acids, polyvinyl sulfonic acid as surfactants in aqueous free radical polymerization is also novel.
    Type: Application
    Filed: June 26, 2006
    Publication date: September 3, 2009
    Applicant: Arkema Inc.
    Inventors: Mehdi Durali, Lotfi Hedhli, Amin-Sanayei Ramin
  • Patent number: 7544765
    Abstract: A process for producing a class of polyarylenes having p-bis-(chlorodifluoromethyl) benzene or p-bis(bromodifluoromethyl) benzene as a comonomer. The p-bis-(chlorodifluoromethyl) benzene or the p-bis(bromodifluoromethyl)benzene act as precursors in a polycondensation reaction with a difunctional monomer.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: June 9, 2009
    Assignees: University of Florida Research Foundation, Inc., Arkema Inc.
    Inventors: William R. Dolbier, Jr., Lotfi Hedhli, Maher Elsheikh, Valerie Rodriguez-Garcia, Kai Wu
  • Patent number: 7449111
    Abstract: A polymer or blend is described which contains at least one acrylic resin or vinyl resin having at least one ionic or ionizable group, and at least one additional polymer. The polymer has small domain sizes with respect to the acrylic resin or vinyl resin. The polymer preferably has improved conductivity when formed into a film. Preferably, the polymers are useful in a variety of applications including in the formation of a membrane which is useful in batteries and fuel cells and the like. Methods of making the polymer blends are also described.
    Type: Grant
    Filed: July 14, 2004
    Date of Patent: November 11, 2008
    Assignee: Arkema Inc.
    Inventors: Lotfi Hedhli, Isabelle Decker, Patrick M. Piccione, Holger Amort, Scott R. Gaboury, Fabienne Piroux
  • Publication number: 20080090992
    Abstract: A process for producing a class of polyarylenes having p-bis-(chlorodifluoromethyl)benzene or p-bis(bromodifluoromethyl)benzene as a comonomer. The p-bis-(chlorodifluoromethyl)benzene or the p-bis(bromodifluoromethyl)benzene act as precursors in a polycondensation reaction with a difunctional monomer.
    Type: Application
    Filed: October 12, 2006
    Publication date: April 17, 2008
    Inventors: William R. Dolbier, Lotfi Hedhli, Maher Elsheikh, Valerie Rodriguez-Garcia, Kai Wu
  • Publication number: 20070259240
    Abstract: A non-perfluoropolymer is described which contains at least one acrylic resin or vinyl resin having at least one ionic or ionizable group and optionally at least one additional polymer. Preferably, the polymers are useful in a variety of applications including in the formation of a membrane which is useful in batteries and fuel cells and the like. Methods of making the polymer blends are also described.
    Type: Application
    Filed: June 26, 2007
    Publication date: November 8, 2007
    Inventors: Lotfi Hedhli, Isabelle Decker, Holger Amort, Scott Gaboury, Jyotsna Iyer