Method for producing an aqueous polymer dispersion

US7632902B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Dirk Wulff · Schifferstadt, DE
• Jesper Feldthusen · Mainz, DE
• Gerhard Auchter · Bad Dürkheim, DE
• Gerald Wildburg · Ludwigshafen, DE
• Ralf Fink · Schifferstadt, DE

Key dates

• Filing date: May 21, 2003
• Grant date: Dec 15, 2009
• Expiry date: Feb 18, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J151/003
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing an aqueous polymer dispersion having a polymer solids content of ≧50% by weight by carrying out the radically initiated aqueous emulsion polymerization of ethylenically unsaturated compounds (monomers). The inventive method is characterized in that: a) a mixture is provided in a polymerization vessel and contains a partial quantity 1 consisting of: deionized water, 0.001 to 0.5 parts by weight of a polymer with a weighted average particle diameter of ≦100 nm; 0.0001 to 0.1 parts by weight of dispersants, and 0.5 to 10 parts by weight of monomers, and the monomers are polymerized with a conversion of ≧80% [polymerization step A], and; b) afterwards, a monomer emulsion containing partial quantity 2, which consists of deionized water, 0.1 to 5 parts by weight of dispersants and 90 to 99.5 parts by weight of monomers, is fed under polymerization conditions to the obtained reaction mixture [polymerization step B], whereby; c) the total amount of the monomers used for the polymerization is equal to 100 parts by weight, and the total amount of deionized water is ≦100 parts by weight.