etal???preferably sodium???or an alkaline earth metal such as magnesium, calcium or zinc. [0118] Preferred benzophenones are compounds of the formula VI, in which, independently of one another, M1 to M4 are hydrogen or C1-C4-alkyl, M1 and M4 are preferably methyl or ethyl, and M2 and M3 are preferably hydrogen. [0119] The spherical isotropic character of the particles present in the dispersions ac