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    PROCESS FOR FRAGMENTING A POLYMER
    2.
    发明申请
    PROCESS FOR FRAGMENTING A POLYMER 有权

    公开(公告)号：US20230040771A1

    公开(公告)日：2023-02-09

    申请号：US17787919

    申请日：2019-12-20

    Applicant: RHODIA OPERATIONS

    Inventor： David James Wilson ,  Alexander Lerch ,  Fan Jiang ,  Bing Hong ,  Stephane Streiff

    IPC: C08J11/16

    Abstract: The instant invention concerns a process for fragmenting a polymer chain, comprising an oxidative degradation step wherein the polymer chain is contacted with a reduced form of a metal M and an oxidant such as dioxygen, and wherein the polymer carries covalently bound chemical groups acting as a ligand of said reduced form of the metal M.
    The invention also relates to methods making use of this fragmentation process as a first step of a degradation process of the polymer especially useful for avoiding the negative impact of a polymer to the environment. In this connection, the invention relates to the use of polymers carrying chemical groups acting as a ligand for a reduced form of a metal M, as a polymer biodegradable in an environment wherein the reduced form of a metal M is present.

    Amphiphilic block polymers soluble in strongly saline medium
    4.
    发明授权
    Amphiphilic block polymers soluble in strongly saline medium 有权

    公开(公告)号：US10808064B2

    公开(公告)日：2020-10-20

    申请号：US15770352

    申请日：2016-10-21

    Applicant: RHODIA OPERATIONS

    Inventor： David James Wilson ,  Mikel Morvan ,  Max Chabert ,  Arnaud Cadix

    IPC: C08F293/00 ,  C08F212/08 ,  C09K8/588 ,  C09K8/68 ,  C08F220/18

    Abstract: The present invention relates to the preparation of polymers that are of use in particular as a rheology agent, and are suitable for use in very concentrated saline media, which comprises a step of micellar radical polymerization in which are brought into contact, in an aqueous medium: —hydrophilic monomers; —hydrophobic monomers in the form of a micellar solution, containing micelles comprising these hydrophobic monomers; —a radical polymerization initiator; and —preferably an agent for controlling radical polymerization, wherein said micelles comprise at least one surfactant of amphoteric nature. The polymers obtained according to the invention are in particular of use for enhanced oil recovery.

    RHEOLOGY MODIFICATION BY POROUS GEL PARTICLES
    6.
    发明申请
    RHEOLOGY MODIFICATION BY POROUS GEL PARTICLES 有权

    公开(公告)号：US20220010086A1

    公开(公告)日：2022-01-13

    申请号：US17294659

    申请日：2019-11-13

    Applicant: RHODIA OPERATIONS

    Inventor： Arnaud Cadix ,  David James Wilson

    IPC: C08J9/08 ,  C08F220/58 ,  C08F220/56 ,  C08J3/12 ,  C08J9/00

    Abstract: Modification of the rheology of a liquid medium, aqueous or nonaqueous, with polymers in the form of specific particles obtained by grinding (micronizing) a porous macrogel, itself prepared by a process comprising a radical polymerization step which comprises reacting in the presence of pore formers monomers containing monomers bearing at least two ethylenic unsaturations, typically in combination with monomers bearing a single ethylenic unsaturation; a polymerization initiator; and optionally a polymerization control agent. These polymer particles keep other particles in suspension within the liquid medium, and also the stabilized suspensions are obtained.

    Controlled radical polymerization in water-in-water dispersion
    8.
    发明授权
    Controlled radical polymerization in water-in-water dispersion 有权

    公开(公告)号：US10160821B2

    公开(公告)日：2018-12-25

    申请号：US14383201

    申请日：2013-03-11

    Applicant: RHODIA OPERATIONS

    Inventor： Mathias Destarac ,  David James Wilson ,  Silvia Stoilova

    IPC: C08F2/10 ,  C08F220/56 ,  C08F2/38 ,  C08F293/00 ,  C09D153/00 ,  C09J153/00

    Abstract: The present invention relates to a method for preparing an aqueous dispersion of water-soluble polymers, which comprises a step (E) of radical polymerization, wherein the following are brought into contact in an aqueous medium (M) in which the synthesized polymer is not soluble: at least one ethylenically unsaturated monomer which is soluble in the aqueous medium (M); at least one source of free radicals; and a reactive stabilizer which comprises: a polymer chain (CP) which is soluble in the medium (M), a group (G) providing the radical polymerization of step (E) with a living and controlled nature, such as, for example, a group carrying a thiocarbonylthio —S(C═S)— group.

    Progressive salting-out of polymer chains in a liquid medium
    10.
    发明授权
    Progressive salting-out of polymer chains in a liquid medium 有权

    公开(公告)号：US11608391B2

    公开(公告)日：2023-03-21

    申请号：US17257839

    申请日：2019-07-02

    Applicant: RHODIA OPERATIONS

    Inventor： Dominique Labarre ,  David James Wilson

    IPC: C09K8/52 ,  C08F2/22 ,  C08F293/00 ,  C09K8/528 ,  C09K8/54 ,  C08F220/18

    Abstract: Provided is a method making it possible to ensure a gradual release of polymer chains within a liquid medium, the method comprising bringing the liquid medium into contact with specific solid objects formed by polymer chains soluble in the medium and carrying hydrophobic side groups ensuring physical crosslinking between the polymer chains within the solid objects. The released chains may in particular be used as inhibitors of the formation of inorganic or organic deposits (scale inhibitors) within a liquid medium, typically in the field of oil extraction.

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