Patents by Inventor Stephane Lepizzera

Stephane Lepizzera 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).

  • Method for purifying (meth)acrylic monomers by distillation
    Patent number: 7029556
    Abstract: The invention concerns a method of purifying a (meth) acrylic monomer selected among (meth) acrylic acids and their esters, by distillation in the presence of at least a polymerisation inhibitor requiring input of oxygen and/or an inhibitor having better efficacy in the presence of oxygen for stabilizing the liquid phase. The invention is characterized in that the distillation is performed in the presence of a NO2 gas, with an oxygen/organic vapor (p/p) ratio ranging between 0.02 and 3%, and with a NO2 condensed organic vapor (p/p) ratio ranging between 0.01 and 50 ppm.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: April 18, 2006
    Assignee: Arkema
    Inventors: Michel Fauconet, Stephane Lepizzera
  • Method for stabilizing acrylic monomers
    Publication number: 20040011638
    Abstract: The invention concerns a method for stabilising acrylic monomers in a distillation column, comprising the following steps: adding at least a stabilising agent for acrylic monomers having a total concentration in the liquid phase ranging between 1 ppm and 5000 ppm; injecting oxygen in the distillation column with a O2/organic vapour mol ratio ranging between 0.01% and 1%; adding a metal sequestering agent having a concentration in the liquid phase ranging between 0.1 and 1000 ppm.
    Type: Application
    Filed: July 16, 2003
    Publication date: January 22, 2004
    Inventor: Stephane Lepizzera
  • Process for the manufacture of 2-ethylhexyl acrylate
    Patent number: 6603036
    Abstract: 2-Ethylhexyl acrylate is obtained by esterification of acrylic acid (AA) with 2-ethylhexanol (2-EtHexOH), in the presence of at least one stabilizer for AA, with H2SO4 as catalyst, the crude reaction mixture (B1) obtained comprising the desired acrylate, 2-EtHexOH, AA, 2-ethylhexyl hydrogensulphate (2-EtHexSO4H), traces of H2SO4 and impurities.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: August 5, 2003
    Assignee: Atofina
    Inventors: Jacqueline Bessalem, Michel Fauconet, Stephane Lepizzera
  • Stabilization of acrolein
    Publication number: 20030065110
    Abstract: At least one nitroxide derivative is used to stabilize pure acrolein or highly concentrated solutions thereof (acrolein content ≧90% by weight), in contact with an essentially anaerobic atmosphere.
    Type: Application
    Filed: August 30, 2002
    Publication date: April 3, 2003
    Inventors: Stephane Lepizzera, Michel Fauconet
  • Process for the manufacture of 2-ethylhexyl acrylate
    Publication number: 20020193623
    Abstract: 2-Ethylhexyl acrylate is obtained by esterification of acrylic acid (AA) with 2-ethylhexanol (2-EtHexOH), in the presence of at least one stabilizer for AA, with H2SO4 as catalyst, the crude reaction mixture (B1) obtained comprising the desired acrylate, 2-EtHexOH, AA, 2-ethylhexyl hydrogensulphate (2-EtHexSO4H), traces of H2SO4 and impurities.
    Type: Application
    Filed: April 2, 2002
    Publication date: December 19, 2002
    Applicant: ATOFINA
    Inventors: Jacqueline Bessalem, Michel Fauconet, Stephane Lepizzera
  • Process for increasing the molar mass of a cationic acryloyloxyethyltrimethylammonium chloride copolymer, and corresponding copolymers
    Publication number: 20020103331
    Abstract: A process for increasing the molar mass of a cationic copolymer of the unsaturated quaternary ammonium salt of formula (I): 1
    Type: Application
    Filed: October 5, 2001
    Publication date: August 1, 2002
    Applicant: ATOFINA
    Inventors: Jean-Luc Zeh, Lionel Sabatier, Stephane Lepizzera