Preparation of aqueous polymer dispersions with a bimodal particle-size distribution

US5990221A · kind A · utility

Assignee

• BASF SE

Inventors

• Burkhardt Dames · Neuwied, DE
• Klemens Mathauer · Ludwigshafen, DE
• Walter Machtle · Ludwigshafen, DE

Key dates

• Filing date: Jul 8, 1997
• Grant date: Nov 23, 1999
• Expiry date: Jul 8, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2/24
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing aqueous polymer dispersions by emulsion polymerization of free-radically polymerizable compounds (monomers) comprises adding, during the polymerization of the monomers, a miniemulsion which is an aqueous, surfactant-stabilized emulsion of monomers whose emulsified droplets have a size of from 10 to 500 nm and which comprises a compound (stabilizer) which is dissolved in the monomers of the droplets and whose solubility in the monomers is at least twice its solubility in water.