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Patents

Aqueous Coating Composition

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

l Patent No. U.S. 6,521,700 B1
Solutia Austria GmbH has been granted a patent for a coating composition comprising a condensation product of a carboxyl group-containing resin having a Staudinger Index, measured in dimethyl formamide as a solvent, of from 4.0-12 cm3/g, and a hydroxyl group-containing a resin having a Staudinger Index, measured in dimethyl formamide as a solvent, of from 8-13 cm3/g, and a curing agent that becomes active only at an elevated temperature of at least 80°C. The curing agent is comprised of a mixture of mass fractions of from 95-20% of a water-insoluble blocked polyfunctional isocyanate and from five to 80% of a hydrophilic blocked isocyanate.

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