Method for producing polybutadiene latex with an optimized thermal current profile

US6852797B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Sabine Oepen · Ellerstadt, DE
• Michael Breulmann · Mannheim, DE
• Norbert Güntherberg · Speyer, DE
• Klaus-Dieter Hungenberg · Birkenau, DE
• Norbert Niessner · Friedelsheim, DE
• Bernhard Czauderna · Hirschberg, DE
• Wil Duijzings · Born, NL

Key dates

• Filing date: Apr 24, 2001
• Grant date: Feb 8, 2005
• Expiry date: Apr 24, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/942
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polybutadiene latex is prepared by a process in which butadiene is polymerized by free radical emulsion polymerization in the presence of initiator and, if required, dispersants and further conventional assistants, the polymerization being carried out in the presence of reactive comonomers in such a way that the heat flow of 43 watt/kg solids content of the polymerization mixture is not exceeded. Owing to the presence of reactive comonomers, the reaction rate at the beginning of the reaction is increased, with the result that an overall flatter heat flow profile is obtained. A preferred reactive comonomer is styrene. Preferably, the process is carried out by a semi-batch procedure in which