Process for making filled resins

A method of making a filled resin, comprising:

• providing a wiped film evaporator comprising an internal evaporator chamber maintained under vacuum conditions and an internal chamber wall maintained at an elevated temperature;
• introducing solvent-borne particles and organic matrix into the internal chamber;
• and
• compounding the solvent-borne particles and the organic matrix in the internal evaporator chamber by forming a thin film against the internal chamber wall, the thin film comprised of organic matrix and particles, the vacuum conditions and elevated temperature being sufficient to remove solvent from the particles and organic matrix to provide the filled resin;
• wherein, less than about 10% of the particles in the filled resin are agglomerated;
• and
• wherein, the organic matrix comprises a thermoset or an ethylenically-unsaturated crosslinkable resin.