Preparation of bead polymers based on water-soluble ethylenically unsaturated monomers by reverse suspension polymerization

US4739009A · kind A · utility

Assignee

• BASF SE

Inventors

• Wilfried Heide · Freinsheim, DE
• Heinrich Hartmann · Schifferstadt, DE
• Christos Vamvakaris · Kallstadt, DE

Key dates

• Filing date: Apr 10, 1987
• Grant date: Apr 19, 1988
• Expiry date: Apr 10, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2/32
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Bead polymers are prepared by reverse suspension polymerization by a process in which an aqueous solution of water-soluble ethylenically unsaturated monomers are polymerized in an aliphatic hydrocarbon using an inorganic suspending agent based on a modified finely divided mineral and, in addition, from 0.1 to 5% by weight, based on the monomers used, of a nonionic surfactant, in the presence of a polymerization initiator, with the formation of a water-in-oil polymer suspension.