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Patents

Non-yellowing polyester

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Patent No. U.S. 7,087,672 B2
E. I. du Pont de Nemours and Co. has been obtained a patent for an aqueous coating composition having a VOC of less than 0.12 kg/L comprised of 25- 70% by weight of film-forming binder and correspondingly, 75-30% by weight of an aqueous liquid carrier for the binder and containing pigment in a pigment to binder weight ratio of 5/100 to 150/100 and having a pH of 7-10; wherein the binder is comprised of 50-95% by weight, based on the weight of the binder, of a blend of polymers comprising a dispersed acrylic polymer, a dispersed polyester having an acid value of 15-60, a number average molecular weight from 1,500 to 7,000 and further having a hydroxyl value with the hydroxyl value being

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