Aqueous polymer dispersions

US5721312A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinrich Grubert · Heidelberg, DE
• Rolf Dersch · Bischofswerda, DE

Key dates

• Filing date: Jul 22, 1991
• Grant date: Feb 24, 1998
• Expiry date: Jul 22, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F14/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aqueous polymer dispersions are obtained by polymerizing a monomer mixture which contains from 10 to 100% by weight of halogenated monomers by radical emulsion polymerization in aqueous medium, adjusting the pH of the aqueous phase of the resulting aqueous polymer dispersion to from 5 to 10 by addition of bases which differ from ammonia and from primary and secondary amines, and adding from 0.005 to 1% of the weight of the monomer mixture of one or more substances from the group comprising glycerol, pivalic acid, paraldehyde, 2,6-di-tert-butyl-p-cresol, benzophenone, alkyl-substituted benzophenones, thiosulfuric acid and salts thereof, and oxalic acid and salts thereof, it being possible to add both the bases and the one or more substances before, during and/or after the emulsion polymerization.