Patents by Inventor Paul Rempp

Paul Rempp 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).

  • Multifunctional initiator for obtaining star-shaped polymers by an anionic route, process for its manufacture and corresponding star-shaped polymers, process for their manufacture and their applications
    Patent number: 5837778
    Abstract: A multifunctional anionic polymerization initiator which is in the form of a star-shaped polymer, and which is soluble in a nonpolar medium and is substantially free of residual double bonds. The initiator is denoted by the general formula (PA).sub.a N.sup.n- nLi.sup.+. PA is a polymer block of a vinylaromatic or diene monomer A. The variable "a" is the number of branches in the block PA. N is a crosslinked core comprising no or practically no residual double bonds and has the formula (PMc)(RLi).sub.p. Mc is a monomer containing at least two polymerizable double bonds per molecule. PMc is a crosslinked core of at least one polymerized monomer Mc, containing 3 to 30% of residual double bonds in relation to the initial double bonds originating from the monomer Mc. R is an alkyl, aryl, arylalkyl, alkylaryl, cycloalkyl, or alkenyl. The variable "p" is the number of residual double bonds in PMc which are neutralized by RLi. The variable "n" is the number of anionic sites present in the crosslinked core N.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: November 17, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Pierre Lutz, Paul Rempp, David Rein, Philippe Heim, Pascal Nicol, Bruno Vuillemin
  • Multifunctional initiator for obtaining star-shaped polymers by an anionic route, process for its manufacture and corresponding star-shaped polymers, process for their manufacture and their applications
    Patent number: 5708091
    Abstract: A multifunctional anionic polymerization initiator which is in the form of a star-shaped polymer, and which is soluble in a nonpolar medium and is substantially free of residual double bonds. The initiator is denoted by the general formula (PA).sub.a N.sup.n- nLi.sup.+. PA is a polymer block of a vinylaromatic or diene monomer A. The variable "a" is the number of branches in the block PA. N is a crosslinked core comprising no or practically no residual double bonds and has the formula (PMc)(RLi).sub.p. Mc is a monomer containing at least two polymerizable double bonds per molecule. PMc is a crosslinked core of at least one polymerized monomer Mc, containing 3 to 30% of residual double bonds in relation to the initial double bonds originating from the monomer Mc. R is an alkyl, aryl, arylalkyl, alkylaryl, cycloalkyl, or alkenyl. The variable "p" is the number of residual double bonds in PMc which are neutralized by RLi. The variable "n" is the number of anionic sites present in the crosslinked core N.
    Type: Grant
    Filed: February 10, 1997
    Date of Patent: January 13, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Pierre Lutz, Paul Rempp, David Rein, Philippe Heim, Pascal Nicol, Bruno Vuillemin
  • Multifunctional initiator for obtaining star-shaped polymers by an anionic route, process for its manufacture and corresponding star-shaped polymers, process for their manufacture and their applications
    Patent number: 5633323
    Abstract: A multifunctional anionic polymerization initiator which is in the form of a star-shaped polymer soluble in an apolar medium and substantially free of residual double bonds. The initiator is denoted by the general formula (PA).sub.a N.sup.n- nLi.sup.+. PA is a polymer block of a vinylaromatic or diene monomer A. The variable "a" is the number of branches in the block PA. N is a crosslinked core comprising no or practically no residual double bonds and has the formula (PMc)(RLi).sub.p. Mc is a monomer containing at least two polymerizable double bonds per molecule. PMc is a crosslinked core of at least one polymerized monomer Mc, containing 3 to 30% of residual double bonds in relation to the initial double bonds originating from the monomer Mc. R is an alkyl, aryl, arylalkyl, alkylaryl, cycloalkyl, or alkenyl. The variable "p" is the number of residual double bonds in PMc which are neutralized by RLi. The variable "n" is the number of anionic sites present in the crosslinked core N.
    Type: Grant
    Filed: August 25, 1995
    Date of Patent: May 27, 1997
    Assignee: Elf Atochem S.A.
    Inventors: Pierre Lutz, Paul Rempp, David Rein, Philippe Heim, Pascal Nicol, Bruno Vuillemin
  • Partially hydrophilic, non-ionic crosslinked copolymers and their application to size exclusion chromatography in aqueous media
    Patent number: 4687814
    Abstract: The invention relates to partially hydrophilic, non-ionic crosslinked copolymers.These copolymers consist of a crosslinked hydrophobic backbone having a high mechanical strength, and of non-ionic hydrophilic chains grafted selectively onto the backbone.The copolymers are useful for size exclusion chromatography in an aqueous medium.
    Type: Grant
    Filed: January 22, 1985
    Date of Patent: August 18, 1987
    Assignee: Centre National de la Recherche Scientifique
    Inventors: Philippe Chaumont, Gerard Beinert, Jean Herz, Paul Rempp