Method for producing aqueous styrene-butadiene-iv polymer dispersions

US7375148B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Wolfgang Gaschler · Shanghai, CN
• Volker Schaedler · Maikammer, DE
• Lambertus Manders · Ludwigshafen, DE
• Thomas Wirth · Freinsheim, DE
• Hubertus Kroener · Ludwigshafen, DE

Key dates

• Filing date: Sep 30, 2002
• Grant date: May 20, 2008
• Expiry date: Jun 18, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F236/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing an aqueous styrene-butadiene polymer dispersion by free-radical aqueous emulsion polymerization of a monomer mixture M comprising styrene, butadiene, and if desired up to 30% by weight, based on 100% by weight of monomers, of ethylenically unsaturated comonomers other than styrene and butadiene; in a polymerization vessel by a monomer feed technique in the presence of a regulator system containing, based on 100% by weight of monomers, from 0.02 to 0.5% by weight of at least one hydrocarbon HC having from 6 to 20 carbon atoms, selected from compounds which on abstraction of a hydrogen atom form a pentadienyl radical or 1-phenylallyl radical, and α-methylstyrene dimer, and from 0.3 to 2% by weight of an organic compound S containing at least one SH group wherein at least 30%, preferably at least 50%, in particular at least 80%, and with particular preference the entirety (or >95%) of hydrocarbon HC is included in the initial charge to the polymerization vessel.