Low-VOC aqueous coating compositions with excellent freeze-thaw stability

US7612126B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Konrad Roschmann · Ladenburg, DE
• Joerg Leuninger · Mainz, DE
• Rolf Dersch · Bischofswerda, DE
• Cheng-Le Zhao · Charlotte, US
• Li Zhuo · Shanghai, CN
• Terri Cunningham · Concord, US

Key dates

• Filing date: Dec 1, 2004
• Grant date: Nov 3, 2009
• Expiry date: Nov 1, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K3/013
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to an aqueous coating composition having excellent freeze-thaw stability and a low-VOC content, comprising a multi-stage polymer dispersion comprising (a) an inner phase comprising at least one latex polymer derived from at least one monomer and at least one polymerizable alkoxylated surfactant having the structure: R1—R2 wherein R1 is an allyl group selected from the group consisting of CH3—CH═CH— and CH2═CH—CH2—, or an acrylic group and R2 is a radical comprising at least two carbon atoms and at least one oxyethylene or oxypropylene unit; (b) an outer phase having a glass transition temperature of from 30° C. to 110° C. containing at least one ethylenic unsaturated monomer (c) at least one pigment; (d) water; and (e) less than 3.0% by weight based on the total weight of the aqueous coating composition of anti-freeze agents.