	US 12,448,528 B2
	Silica-based matting agents and methods of making and using the same
Feng Gu, Ellicott City, MD (US); and James Neil Pryor, West Friendship, MD (US)
Assigned to W.R. Grace & Co.-Conn., Columbia, MD (US)
Appl. No. 17/426,440
Filed by W.R. Grace & Co.-Conn., Columbia, MD (US)
PCT Filed Jan. 28, 2020, PCT No. PCT/US2020/015308 § 371(c)(1), (2) Date Jul. 28, 2021, PCT Pub. No. WO2020/159916, PCT Pub. Date Aug. 6, 2020.
Claims priority of provisional application 62/799,974, filed on Feb. 1, 2019.
Prior Publication US 2022/0186045 A1, Jun. 16, 2022
Int. Cl. C09D 7/42 (2018.01); C09C 1/30 (2006.01); C09C 3/10 (2006.01); C09D 7/20 (2018.01); C09D 7/62 (2018.01); C09D 15/00 (2006.01); C09D 133/00 (2006.01)

CPC C09D 7/42 (2018.01) [C09C 1/3072 (2013.01); C09C 3/10 (2013.01); C09D 7/20 (2018.01); C09D 7/62 (2018.01); C09D 15/00 (2013.01); C09D 133/00 (2013.01); C01P 2004/61 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01)]

19 Claims

1. 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.