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 |
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.
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