Method for producing aqueous styrene-butadiene polymer dispersions III

US7282545B2 · 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: Oct 16, 2007
• Expiry date: May 26, 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 containing from 40 to 80% by weight of styrene as monomer M1, from 20 to 60% by weight of butadiene as monomer M2, and from 0 to 40% by weight, based on 100% by weight of monomers, of ethylenically unsaturated comonomers M3 other than styrene and butadiene by a monomer feed technique in the presence of from 0.05 to 0.5% by weight, based on 100% by weight of monomers, of at least one hydrocarbon HC having 6 to 20 carbon atoms, which is selected from compounds which on abstraction of a hydrogen atom form a pentadienyl radical or a 1-phenylallyl radical and from α-methylstyrene dimer comprises including at least 30% of the hydrocarbon HC in the initial charge to the polymerization vessel and supplying the remainder of the hydrocarbon HC to the polymerization reaction in the course of that reaction.