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US 6,555,638 B2Granted
Production of water-expandable styrene polymers
AssigneeBASF SE
InventorsAchim Datko, Peter Dodel, Klaus Hahn
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Abstract
A process for the preparation of styrene polymers containing water as the sole expanding agent by polymerization of styrene in aqueous suspension in the presence of an amphiphilic organic emulsifier which carries both hydrophilic and hydrophobic groups, or a polar group-containing, water-miscible polymer.
Claims13
A process comprising
- polymerizing styrene and, optionally, one or more comonomers, in an aqueous suspension,
- wherein an emulsifying auxiliary is added to the aqueous suspension at the commencement of or during the polymerization,
- wherein the emulsifying agent is an amphiphilic organic emulsifier having both hydrophilic and hydrophobic groups, or a polar group-containing water-miscible polymer,
- wherein the aqueous suspension comprises suspended styrene droplets, and
- wherein water is emulsified in the styrene droplets.
2 more elements
Dependencies are inferred from the claim text.