Emulsion polymerization process with combination macroemulsion and miniemulsion feed streams

US6160049A · kind A · utility

Assignee

• BASF SE

Inventors

• Klemens Mathauer · Ludwigshafen, DE
• Walter Machtle · Ludwigshafen, DE
• Graham E. McKee · Ludwigshafen, DE
• Hubertus Kroner · Ludwigshafen, DE

Key dates

• Filing date: Oct 28, 1998
• Grant date: Dec 12, 2000
• Expiry date: Oct 28, 2018

Classification

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

Abstract

A process for preparing an aqueous polymer dispersion by free-radically initiated polymerization of free-radically polymerizable compounds I with moderate solubility in water, whose disperse polymer particles contain not only compounds I but also compounds II with a very low solubility in water where a mixture consisting of a portion of the compounds I and consisting of the compounds II is used to produce an aqueous emulsion I with a droplet size .ltoreq.500 nm, and at least a portion of the aqueous emulsion I is supplied continuously to the polymerization vessel as a feed stream I, in the course of continuing free-radical polymerization, during which the continuous feed stream I is accompanied, at least some of the time, by a feed stream II consisting of another portion of the compounds I or of the aqueous emulsion II thereof with a droplet size .gtoreq.1000 nm.