Patent ID: 7828889
Filing Date: 2010-11-09
Classification: B05D,B08B,B82Y,C01P,C09C,C09D

Abstract:
1. A treatment composition for forming a detachable and renewable protective coating on a receptive surface comprising: (i) 0.05 to 5.0 percent by weight of a plurality of hydrophobically modified fumed silica particles having a median particle size of between 100 and 4,000 nanometers; (ii) 99.95 to 5 percent by weight of a volatile solvent; (iii) optionally, 0.001 to 5 percent by weight of a suspending agent; (iv) optionally, 0.001 to 5 percent by weight of a functional adjunct; and (v) optionally, in balance to 100 percent by weight if present, a propellant; wherein said treatment composition when applied to said receptive surface deposits said protective coating on said receptive surface, wherein said protective coating provides dirt- and water-repellency to said receptive surface, and wherein said 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; and wherein said treatment composition is obtained by dilution of a process composition comprising the plurality of 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: 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 (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; and (c) optionally adding a durability agent to said solution at step (a) and/or with step (b), wherein said durability agent is selected from alkoxysilanes of general formula (III) wherein R5 is a straight or branched, saturated or unsaturated alkyl chain group of from 1 to 16 carbon atoms, optionally substituted with fluorine atoms, hydroxyl, amino, mercapto, or epoxy groups, R6 is an alkyl chain of 1 to 2 carbon atoms, and a is 1 or 2; or alkyl-modified linear or cyclic polydimethylsiloxanes of general formulas (IV) or (V) wherein R7 is an alkyl chain group of from 6 to 24 carbon atoms, n is from 1 to 100, o is from 1 to 40, p from 0 to 7, and q is from 1 to 7, provided that the sum (p+q) is at least 3, to the dispersion as obtained in step (b) or step (c), whereby the concentration of any one of the durability agents (III) and/or (IV) and/or (V) is between 0.01 and 10 percent by weight of the total weight of the process composition.