Silica-based matting agents and methods of making and using the same
AssigneeW.R. Grace & Co.-Conn.
InventorsFeng Gu, James Neil Pryor
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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 from the silica-based matting agents on a wood substrate unexpectedly provide improved chemical resistance and/or film clarity to the surface of the wood substrate. Methods of making and using the silica-based matting agents are also disclosed.
Claims19
A matting agent for aqueous coating compositions comprising composite silica particles, wherein the composite silica particles have a total pore volume of less than 0.20 cc/g as determined by Barrett-Joyner-Halenda (BJH) method and a final particle surface area of less than about 10 m2/g as determined by Brunauer Emmet Teller (BET) nitrogen adsorption method, said composite silica particles comprising:
- (a) porous silica particles;
- and
- (b) one or more waxes in an amount sufficient to at least partially fill pores of the porous silica particles.
Dependencies are inferred from the claim text.