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    AN AQUEOUS SEPARATION PROCESS FOR MULTIPLE POLYMER COMPONENTS
    4.
    发明公开
    AN AQUEOUS SEPARATION PROCESS FOR MULTIPLE POLYMER COMPONENTS 审中-公开

    公开(公告)号：EP4464739A3

    公开(公告)日：2025-02-26

    申请号：EP24196782.7

    申请日：2022-06-17

    Applicant: Dow Global Technologies LLC

    Inventor： GORIN, Craig F. ,  WANG, Jin ,  MATTEUCCI, Scott T. ,  MARTIN, Jill M. ,  WANG, En

    IPC: B29B17/02 ,  C08J11/08

    Abstract: A process for separating and recovering at least one polymer component from a melt of a multiple number of polymer components comprising the steps of:
    (a) providing a multi-polymer component thermoplastic article having at least a first polymer component and at least a second polymer component;
    (b) melting the multi-polymer component thermoplastic article to form a melt of the multi-polymer component thermoplastic article; wherein the melt comprises at least a first polymer component melt stream and at least a second polymer component melt stream; wherein the multi-polymer component melt has at least two melting temperatures, at least two glass transition temperatures, or combinations thereof;
    (c) providing a pressurized aqueous solution including an aqueous liquid mixture of:
    (i) water, and
    (ii) at least one dispersing agent;

    (d) adding the melt of step (b) to the pressurized aqueous solution of step (c);
    (e) shearing the multi-polymer component melt of step (b) in the presence of the pressurized aqueous solution of step (c); wherein the shearing of the multi-polymer component melt in contact with the pressurized aqueous solution forms a dispersion, particles, or strands of the at least one first polymer component stream having an enriched first polymer component concentration;
    (f) after the shearing of step (e), separating the dispersion, particles or strands of the at least one first polymer component stream having an enriched first polymer component concentration from the water, the at least one dispersing agent, the at least one second polymer component, and any remaining components in the mixture of the multi-polymer component melt and pressurized aqueous solution; and
    (g) recovering the separated dispersion, particles or strands of step (f).

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