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US 11,999,857 B2Granted
Coated particles and methods of making and using the same
AssigneeW.R. Grace & Co.-Conn.
InventorFeng Gu
Life of this patent
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Abstract
Improved silica based matting agents are disclosed. The matting agents are useful in waterborne coatings composition to provide exceptional properties to a wood based substrate. Films resulting on the coated substrate unexpectedly provide improved chemical resistance, thermal stress resistance, weather resistance, and/or film clarity to the surface of a wood substrate. Methods of making and using the matting agents are also disclosed.
Claims21
A matting agent comprising coated silica particles, said coated particles consisting of:
- silica particles having a particle surface;
- and
- greater than 30.0 weight percent (wt %), based on a total weight of said silica particles, of (i) one or more waxes, (ii) one or more polymers, or (iii) any combination of (i) and (ii) coated on said particle surface;
- wherein said one or more polymers comprise polydiene, vulcanized polydiene, polyvinyl polypyrrolidone, cellulose acetate butyrate, or any combination thereof;
- and
- wherein the coated silica particles are solvent-free, free-flowing particles and have an average particles size of from about 3.0 μm to about 12 μm.
3 more elements
Dependencies are inferred from the claim text.