Patent ID: 8309615

Claim:
An aqueous silica dispersion comprising a combination of: 1 to 30 weight %, based on a weight of said aqueous silica dispersion, of silica particles having a surface, said silica particles having an average diameter of 1 to 10 microns; 0.01 to 10 weight %, based on a weight of said silica particles, reacted aminosilane compound attached to said surface of said silica particles; 5 to 25 weight %, based on the weight of said silica particles, of an anionic polymeric dispersing agent, wherein the anionic polymeric dispersing agent is an addition polymer having acid groups or salts thereof, containing as polymerized units, at least one ethylenically unsaturated acid containing monomer and optionally at least one ethylenically unsaturated nonionic monomer, wherein the at least one ethylenically unsaturated acid containing monomer is selected from acrylic acid, methacrylic acid, itaconic acid, fumaric acid, crotonic acid, maleic acid, monomethyl itaconate, monomethyl fumarate, monobutyl fumarate, maleic anhydride, and itaconic anhydride, and wherein the at least one ethylenically unsaturated nonionic monomer comprises alkyl esters of (meth)acrylic acid, hydroxy esters of (meth)acrylic acid, aromatic monomers, and alkenes; and an aqueous medium; wherein said silica particles are dispersed in said aqueous medium, and wherein the aqueous silica dispersion comprises a viscosity no more than 2 Pa-s.