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AssigneeSaudi Basic Industries Corporation
InventorsGhurmallah Al-Ghamdi, Mohammed Hamdan, Martinus Adrianus Gertrudus Jansen, Laurentius Nicolaas Ida Hubertus Nelissen
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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 composition 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).
A process for an emulsifier-free preparation of water expandable polymer beads, comprising:
Water expandable polymer beads comprising a copolymer of styrene and a polar comonomer containing a carbon-to-carbon double bond and modifier-free nanoclay.
Dependencies are inferred from the claim text.