Water expandable polymer beads containing latex particles

Ghamdi Ghurmallah (Inventor), Timotheus Johannes Jacobus Sciarone (Inventor), Thierry Leblanc (Inventor), Tom Bus (Inventor)

Research output: PatentPatent publication

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An emulsifier-free process for the preparation of water expandable polymer beads, including: a) providing an emulsifier-free starting composition comprising styrene, b) prepolymerizing the starting composition to obtain a prepolymer composition, c) mixing an aqueous blowing agent with the prepolymer composition at an elevated temperature to obtain an inverse emulsion of water droplets in the prepolymer composition, wherein the aqueous blowing agent comprises water and a water soluble initiator dissolved in the water and the water droplets comprise spheres of a styrene polymer, wherein the water soluble initiator partly decomposes due to the elevated temperature leading to the formation of the inverse emulsion of water droplets in the prepolymer composition, d) suspending the inverse emulsion in an aqueous medium to yield an aqueous suspension of suspended droplets and e) polymerizing monomers in the droplets of the suspension obtained by step d) to obtain the water expandable polymer beads.

Original languageEnglish
Patent numberUS2017313842
IPCC08J 9/ 20 A I
Priority date2/12/14
Filing date30/11/15
Publication statusPublished - 2 Nov 2017


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