Patent ID: 8110037

Claim:
A treatment composition for forming a hydrophobic, dirt-repellent, and water-repellent coating comprising: (a) a plurality of particles colloidally dispersed in a volatile solvent, (b) optionally, a surfactant; and (c) optionally, water wherein the volatile solvent is greater than 50% by weight of the treatment composition and water is less than 5% by weight of the treatment composition; and wherein said treatment composition is formed by creating a pre-dispersion comprising hydrophobically modified fumed silica particles obtained by a process comprising the steps of: (a) providing a pre-dispersion of silica particles comprising hydrophobically modified fumed silica particles by stirring said silica particles into a solution comprising: (i) at least one compound of general formula (I) or (II): (R1R2R3Si)2NR4 (I) —(R1R2SiNR4) m -(cyclo) (II) wherein R1, R2 and R3 can be the same or different, and are independently selected from hydrogen, straight or branched, saturated or unsaturated alkyl chain groups of from 1 to 8 carbon atoms, or aromatic groups of from 6 to 12 carbon atoms, R4 is hydrogen or a methyl group, and m is from 3 to 8; and (ii) said volatile solvent or a solvent mixture; and (b) mixing with a disperser said pre-dispersion to provide a process composition while reducing said silica particles to a median particle size in the range between 100 and 4000 nanometers; wherein said treatment composition forms a coating on a receptive surface that creates a high contact angle for repelling water and dirt and wherein the coating is substantially transparent and results in a change of less than 3.0 Delta E units to said receptive surface measured before and after deposition of said coating.