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Dow Corning patents architectural coating containing silicone resins

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

U.S. 7,807,744 B2

Dow Corning Corporation has received a patent for an architectural coating composition consisting of (i) 0.5-10% by weight of a silicone resin based on the total weight of the architectural coating composition, wherein the silicone resin is a DT silicone resin containing 5-60% mole of units of the formula R2SiO2/2 and 40-95% mole of units of the formula R′SiO3/2 or a MTQ silicone resin containing units of the formula (R3SiO1/2)a, units of the formula (R′SiO3/2)b, and units of the formula (SiO4/2)c, where a has a value of 0.05 to 0.5, b has a value of 0.05 to 0.75, c has a value of 0.05 to 0.6, with the proviso that the value of a +b +c is equal to one, wherein R is an alkyl group containing from one to eight carbon atoms and R′ is propyl; (ii) 10-50%  by weight of an acrylic resin based on the total weight of the architectural coating composition; (iii) 20 -80% by weight of a carrier based on the total weight of the architectural coating composition. The carrier is comprised of water, a water compatible carrier, or mixtures thereof; (iv) 0.5-40% by weight of a pigment based on the total weight of the architectural coating composition; (v) 0.5-10% by weight of a surfactant based on the total weight of the architectural coating composition, the surfactant is comprised of an anionic surfactant, a nonionic surfactant, or mixtures thereof; and optionally (vi) 0-5% by weight of an additive based on the total weight of the architectural coating composition, wherein the additive is selected from the group consisting of a thickener, a pigment dispersant, a defoamer, a biocide, and amine compounds.

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