Patents by Inventor Richard Peres

Richard Peres 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).

  • Vinyl chloride-based polymers capable of giving plastisols having specific properties, and process for obtaining them
    Patent number: 6433060
    Abstract: The present invention relates to a process for seeded microsuspension polymerization of vinyl chloride in aqueous medium under the action of at least one organosoluble initiator, at least one reducing agent and at least one water-soluble metal salt in the presence of at least one fatty acid alkali metal or ammonium salt. It also relates to the polymers obtained in this way which are suitable for giving plastisols having specific properties.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: August 13, 2002
    Assignee: Atofina
    Inventors: Christian Bonardi, Bernard Bonnaud, André Chippaux, Richard Peres
  • Process of polymerizing vinyl chloride with hydroxylamines
    Patent number: 6340729
    Abstract: In the process according to the invention for the aqueous suspension polymerization of vinyl chloride, alone or as a mixture with another vinyl monomer, the polymerization initiator comprises at least one compound chosen from dialkyl peroxydicarbonates, peroxy-tert-alkanoates and diacyl peroxides and use is made, as agent for halting the polymerization, of a mono- or disubstituted hydroxylamine. The resins thus obtained exhibit improved color and heat stability.
    Type: Grant
    Filed: July 11, 2001
    Date of Patent: January 22, 2002
    Assignees: Atofina Chemicals, Inc., Atofina
    Inventors: Christian Bonardi, Pierre Hebrard, Richard Peres, Kenneth Malone, Martin Nosowitz, Michael Mendolia, Peter Callais, Barbara Stainbrook, Jianfeng Lou
  • Bipopulated latex of polymers based on vinyl chloride, processes for the production thereof and application thereof in plastisols exhibiting improved rheology
    Patent number: 6297316
    Abstract: The present invention relates to a latex containing two populations of particles of polymers based on vinyl chloride. Other subjects of the present invention are processes for producing this latex and its use in the manufacture of fluid plastisols which are stable on storage.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: October 2, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Philippe Espiard, Richard Peres, Benoit Ernst
  • Bipopulated latex based on vinyl chloride polymers having a high population level of fine particles, processes for the manufacture thereof and applications thereof
    Patent number: 6245848
    Abstract: The present invention relates to a latex containing two populations of particles of polymers based on vinyl chloride, respectively exhibiting mean diameters of between 0.9 and 1.3 &mgr;m and between 0.15 and 0.3 &mgr;m, in proportions such that the ratio by weight of the population with the lesser mean diameter to that with the greater mean diameter is between 0.4 and 0.7. Other subjects of the present invention are processes for the manufacture of the said latex and its application in fluid plastisols and foams of very good cellular quality.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: June 12, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Philippe Espiard, Richard Peres, Benoit Ernst
  • Latex based on vinyl chloride copolymers with a specific structure, process for the manufacture thereof and applications thereof
    Patent number: 5872155
    Abstract: The present invention relates to vinyl chloride copolymers, in the latex form, the particles of which are composed of a core, of an outer layer and optionally of an intermediate layer. It also relates to the process for the manufacture of this latex by seeded miscosuspension polymerization and to its applications in paints and plastisols.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: February 16, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Philippe Espiard, Richard Peres, Benoit Ernst