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US 12,668,494 B2Granted
Spherical, low surface area precipitated silicas as matting agents in powder coatings
AssigneeEvonik Operations GmbH
InventorsBob Tse-Weng Lin, Maria Nargiello, Bernhard Resch, Karl W. Gallis, William J. Hagar
Life of this patent
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Abstract
Spherical, low surface area precipitated silicas are useful as matting agents in powder coatings. Corresponding matte powder coating compositions and methods of preparing matte powder coatings containing the silicas are provided.
Claims21
A matte powder coating composition, comprising:
- (a) one or more resin;
- and
- (b) spherical precipitated silicas having a Brunauer, Emmett, and Teller (B.E.T.) surface area in a range of 4.5 to 15 m2/g, an oil absorption of less than 40 g/100 g, and a median particle size (d50) in a range of 1 to 20 μm.
A matting agent for a powder coating composition, comprising:
- spherical precipitated silicas having a B.E.T. surface area of 4.5 to 15 m2/g, an oil absorption of less than 40 g/100 g, and a median particle size (d50) of 1 to 20 μm.
Dependencies are inferred from the claim text.