Liquid viscous product based on an organofunctional silane system for producing weathering-stabile protective coatings for preventing surface soiling

A composition which comprises

• (a) 0.5 to 15% by weight, relative to the total solids content of said composition, of an organofunctional silane, in which fluorinated alkyl groups of formula F3C(CF2)r(CH2)s— are attached at least to some of the Si atoms, r being an integer between 1 and 18 and s being 0 or 2, and the organofunctional silane is:
• (a2) fluoroalkyl-functional of formula (I)
• RO[Si(A)(CH3)z(OR)1-zO]a[Si(B)(R2)y(OR)1-yO]b[Si(C)(CH3)O]c[Si(D)(OR)O]d.(HX)e (I)
• in which A is an aminoalkyl radical derived from formula (II)
• H2N(CH2)f(NH)g(CH2)hSi(OR)3-z(CH3)z (II)
• where 0≦f≦6, g=0 if f=0 and g=1 if f>0, 0≦h≦6, and 0≦z≦1,
• and B is a fluoroalkyl radical derived from formula (III)
• R1—Ym—(CH2)2Si(R2)y(OR)3-y (III)
• R1 being a mono-, oligo- or perfluorinated alkyl group having 1 to 9 carbon atoms or a mono-, oligo- or perfluorinated aryl group, Y being a CH2—, O— or S group, R2 being a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms or an aryl group, m being 0 or 1 and 0≦y≦1, and C is an alkyl radical derived from the general formula (IV)
• R3—Si(CH3)(OR)2 (IV)
• and D is likewise an alkyl radical, but derived from formula (V)
• R3—Si(OR)3 (V)
• R3 in the above formulae being a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms, R3 in the above formulae being identical or different at each occurrence, R in the above formulae being a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms or an aryl group, and R in the above formulae being identical or different at each occurrence, and HX being an acid, X being an organic or inorganic acid radical, and 0≦y≦1, 0≦z≦1, a>0, b>0, c≧0, d≧0, e≧0 and (a+b+c+d)≧2,
• or a mixture of said (a2) and at least one of:
• (a1) an organosiloxane comprising
• at least one triamino group of formula (Ia)
• [NHx(CH2)aNHy(CH2)bNHz]— (Ia),
• attached to at least one silicon atom via at least one further N-attached alkylene group having 1 to 4 carbon atoms, a and b being identical or different and being an integer from 1 to 6, x being 0 or 1 or 2, y being 0 or 1, z being 0 or 1 or 2, with the proviso that (x+y+z)≦4, and
• at least one Si—C-attached fluoroalkyl group of formula (Ib)
• F3C(CF2)r(CH2)s— (Ib),
• in which r is an integer from 0 to 18 and s is 0 or 2, and
• (a3) an oligomerized organopolysiloxane cocondensate obtained by mixing an organosilane having the formula (II), in which f is 0 or an integer from 1 to 6, g is 0 if f is 0 and g is 1 if f is other than 0, h is an integer from 1 to 6, z is 0, 1 or 2, and the remaining radicals are as defined above, with at least one of a fluoro-functional organosilane having the formula (III), in which y is 0 or 1, with at least one organosilane of the formula (IV), and one organosilane of the formula (V), in a molar ratio M=[a/(b+c+d)]≧0.1, a being the sum of the numbers of moles of organosilanes of formula (II), b, optionally, being the sum of the numbers of moles of organosilanes of formula (III), c, optionally, being the sum of the numbers of moles of organosilanes of formula (IV), and d, optionally, being the sum of the numbers of moles of organosilanes of the formula (V);
• adding water or an acid, and, optionally, an alcohol, to the mixture;
• and carrying out oligomerization
• (b) >1.5 to 10% by weight, relative to the total solids content of said composition, of a cellulosic thickener, and
• (c) water or another diluent, present in an amount that makes up the overall formulation of said composition to 100%.