US 11,987,501 B2
Aqueous hydrophobic silica dispersions
Lang H. Nguyen, Lowell, MA (US); Kavita K. Pai, Nashua, NH (US); Steven Jacobs, Edgartown, MA (US); Tianqi Liu, Boxborough, MA (US); Melissa J. Monello, Waltham, MA (US); Angelica M. Sanchez Garcia, Somerville, MA (US); Zhangliang Gui, Shanghai (CN); and Takashi Umehara, Yokohama (JP)
Assigned to Cabot Corporation, Boston, MA (US)
Appl. No. 16/959,278
Filed by Cabot Corporation, Boston, MA (US)
PCT Filed Jan. 24, 2019, PCT No. PCT/CN2019/072987
§ 371(c)(1), (2) Date Jun. 30, 2020,
PCT Pub. No. WO2019/144910, PCT Pub. Date Aug. 1, 2019.
Claims priority of provisional application 62/621,684, filed on Jan. 25, 2018.
Prior Publication US 2021/0053833 A1, Feb. 25, 2021
Int. Cl. C01B 33/141 (2006.01); C09D 7/40 (2018.01); C09D 7/61 (2018.01); C09D 133/04 (2006.01); C09D 175/04 (2006.01); D06M 11/79 (2006.01)
CPC C01B 33/1417 (2013.01) [C09D 7/61 (2018.01); C09D 7/70 (2018.01); C09D 133/04 (2013.01); C09D 175/04 (2013.01); D06M 11/79 (2013.01); C01P 2006/10 (2013.01); C01P 2006/12 (2013.01); C01P 2006/82 (2013.01); D06M 2200/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An aqueous hydrophobic silica dispersion comprising a mixture of:
an aqueous base dispersion comprising at least 5 wt % of a hydrophilic particulate silica selected from the group consisting of fumed silica, colloidal silica, and precipitated silica;
hydrophobic silica comprising a particulate silica selected from the group consisting of fumed silica, colloidal silica, silica aerogel, and precipitated silica, the hydrophobic silica having a methanol number of at least 60; and
a dispersant having at least one cationic or cationizable group and an HLB ratio of 2 to 20,
wherein the total amount of particulate silica in the dispersion is at least 15% by weight.