Hydrophobically modified pigment composition

A composition comprising an aqueous dispersion of metal oxide pigment particles coated with an organosilane polymer comprising structural units of a) an alkyltrihydroxysilane or a salt thereof at a concentration in the range of from 50 to 98.9 mole percent;

• b) a dialkyldihydroxysilane or a salt thereof at a concentration in the range of from 1 to 49.9 mole percent;
• and c) an ancillary alkysilanetriol at a concentration in the range of from 0.1 to 4 mole percent;
• wherein all concentrations are based on the total structural units of the alkyltrihydroxysilane monomer, the dialkyldihydroxysilane monomer, and the ancillary alkylsilanetriol;
• wherein the ancillary alkylsilanetriol is 3-aminopropylsilanetriol or a salt thereof or 3,3,3-trifluoropropylsilanetriol or a salt thereof;
• and wherein the aqueous dispersion has a pH in the range of from 7.5 to 12.