Acrylic-free waterborne coating from BASF.Patent No. U.S. 6,555,231 B2 BASF BASF Bar Association of San Francisco (since 1872; San Francisco, California) BASF Badische Anilin und Soda Fabrik (German chemical products company) BASF Builders Association of South Florida Corp. has received a patent for an acrylic-free, waterborne coating composition for producing a waterborne paint film having improved chip resistance on a substrate. The waterborne coating composition is comprised of an aqueous aqueous /aque·ous/ (a´kwe-us) 1. watery; prepared with water. 2. see under humor. a·que·ous adj. polyurethane dispersion, having a glass transition temperature The glass transition temperature is the temperature below which the physical properties of amorphous materials vary in a manner similar to those of a solid phase (glassy state), and above which amorphous materials behave like liquids (rubbery state). from 0[degrees] C. or less, substantially free from co-solvents and having at least one carboxyl group carboxyl group (kärbŏk`sĭl), in chemistry, functional group that consists of a carbon atom joined to an oxygen atom by a double bond and to a hydroxyl group, OH, by a single bond. , a water-soluble cross-linker reactive with the carboxyl groups. The aqueous polyurethane dispersion and the water-soluble cross-linker form a binder component of the waterborne coating composition, the binder component is comprised of from 60 to 90% by weight of the aqueous polyurethane dispersion based on 100% by weight of the binder component and from 10 to 40% by weight of the water-soluble cross-linker based on 100% by weight of the binder component. |
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