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    MAKING PARTICLES WITH RADIAL VARIATION
    1.
    发明公开
    MAKING PARTICLES WITH RADIAL VARIATION 审中-实审

    公开(公告)号：EP4335549A2

    公开(公告)日：2024-03-13

    申请号：EP24153406.4

    申请日：2018-09-21

    申请人： DDP Specialty Electronic Materials US 8, LLC

    发明人： SAVO, Andrew M. ,  FINCH, John David ,  JONES, Thomas

    IPC分类号： B01J39/20

    摘要： Provided is a process of making polymeric beads comprising
    (a) providing a suspension of monomer droplets in an aqueous medium at pH of 7 or less,
    wherein the monomer droplets comprise one or more monofunctional vinyl monomers, one or more multifunctional vinyl monomers, and one or more initiators,
    wherein the aqueous medium comprises one or more derivatives of a nitrite salt in an amount, by weight based on the weight of the aqueous medium, of 0.011% to 0.5%,

    (b) initiating polymerization of the monomer,
    wherein no pH-raising substance is added after beginning step (b) until 60% or more by weight of all monofunctional monomer has been converted to polymer,
    and further wherein the monomer droplets contain no porogen or contain porogen in an amount of 0.3% or less, by weight based on the weight of the monomer droplets.