Finely divided aqueous particle-stabilized pickering emulsion and particles produced therefrom

A process for producing particles (P) comprising a core (K) containing polymeric material and a shell (H) composed of particulate solid (F), comprising:

• in a first step, an aqueous, particle-stabilized Pickering emulsion (E) of a material (S) amenable to polyaddition, to polycondensation or to chain polymerization and selected from siloxane and silane is produced by
• mixing an aqueous phase (W), a material (S) amenable to polyaddition, to polycondensation or to chain polymerization and selected from siloxane and silane, and a particulate silicon (IV) oxide solid (F);
• forming droplets having a mean diameter d50 of at most 9 μm and comprising the material (S) and the particulate solid (F);
• wherein the particle-stabilized Pickering emulsion has a mass ratio Q1=m(F)/m(S)*100 is any number from 8 to 18, a mass ratio Q2=m(S)/(m(S)+m(W))*100 is any number from 60 to 70, and the relationship between Q1 and Q2 is Q2=−(1.56 *Q1)+Q3, wherein Q3 is a number between 82 and 88;
• and
• wherein the d50 is determined using a dynamic image analysis according to ISO 13322-2, a measurement range of 0.8 μm-30 mm, and a dry measurement of powders and granules, dispersing pressure=2 bar;
• and
• in a second step, the material (S) of the aqueous, particle-stabilized Pickering emulsion (E) is subjected to a polyaddition, chain polymerization or condensation.