Water expendable polymer beads

Ghamdi Ghurmallah (Inventor), Mohammed Hamdan (Inventor), Martijn A.G. Jansen (Inventor), Laurent N.I.H. Nelissen (Inventor)

    Research output: PatentPatent publication

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    Abstract

    The present invention relates to a process for the emulsifier-free preparation of water expandable polymer beads. The process comprises the steps of: a) providing an emulsifier-free monomer composition comprising styrene and a polar comonomer comprising a carbon-to-carbon double bond, b) prepolymerizing the monomer composition to obtain a prepolymer composition comprising styrene, the polar comonomer and their copolymer, c) adding an aqueous dispersion of nanoclay to the prepolymer com- position to obtain an inverse emulsion, d) suspending the inverse emulsion obtained by step c) in an aqueous medium to yield an aqueous suspension of suspended droplets and e) polymerizing the monomers in the droplets of the suspension obtained by step d).
    Original languageEnglish
    Patent numberWO2013/029757
    Priority date26/08/11
    Filing date21/08/12
    Publication statusPublished - 7 Mar 2013

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