Basf Aktiengesellschaft

Basf Aktiengesellchaft

Li Zhuo

Cheng-Le Zhao

Terri A Cunningham

Joachim Pakusch

Rolf Dersch

Erich Gulbins

Konrad Roschmann

Uwe Dittrich

Joerg Leuninger

Harald R&ouml;ckel

Alan Smith

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: R&#x2014;Rwherein R1 is an allyl group selected from the group consisting of CH&#x2014;CH&#x2550;CH&#x2014; and CH&#x2550;CH&#x2014;CH&#x2014;, or an acrylic group and Ris 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&#xb0; C. to 110&#xb0; 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.

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

The present invention is an aqueous coating composition having excellent freeze-thaw stability and a low-VOC content. The aqueous coating composition of the invention includes at least one latex polymer derived from at least one monomer and at least one polymerizable alkoxylated surfactant, at least one pigment, and water. In accordance with the invention, less than 3.0% by weight of anti-freeze agents based on the total weight of the aqueous coating composition are used in the composition. The present invention also includes a method of preparing an aqueous coating composition such as a latex paint including the above components.

A multi-stage emulsion polymer containing at least one first domain having a glass transition temperature Tg of from &minus;10 to &plus;40&deg; C. and at least one second domain having a Tg of from &plus;50 to 120&deg; C., the weight ratio of the first domain to the second domain being within the range from 90:10 to 50:50. The first and/or the second domain containing from 0.1 to 10% by weight of a nitrogen-coutaining adhesion monomer and the first domain containing at least 10% by weight of vinyl aromatic compounds and/or the second domain containing at least 15% by weight of vinyl aromatic compounds and/or C to C alkylmethacrylates.

Multistage emulsion polymer

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Fort Mill, SC, United States of America

Li Zhuo