Molding or coating materials, in particular coating substances for producing
self-cleaning moldings or coatings, for example on facades and other building elements,
which if they are exposed to rain or moving water from time to time, clean themselves
and prevent permanent settlement of dirt particles and pollutants. In accordance
with the invention that object is attained with molding or coating materials having
the features set forth in the opening part of this specification, which are characterized
in that the filler contained has an at least bimodal particle size distribution,
wherein the one particle size range (A) has a mean particle diameter of at least
5 m and the other particle size range (B) has a mean particle diameter of
at most 3 m and the weight ratio of the particles of the former particle
size range (A) to the particles of the latter particle size range (B) is between
0.01:1 and 12:1 and the constituents of the dispersion arc so selected in respect
of their hydrophilic properties that the static initial contact angle after 3 min
equilibration is greater than 130.
