Patent ID: 8921442

Claim:
A process for the preparation of polymer lattices comprising polymer nanoparticles by a photo-initiated heterophase polymerization, the process comprising: A) preparing a heterophase medium comprising a dispersed phase and a continuous phase and at least one of: at least one surfactant, at least one photoinitiator, and at least one polymerizable monomer; and B) polymerizing the at least one polymerizable monomer by irradiating the heterophase medium with electromagnetic radiation so as to induce a generation of radicals, wherein, the at least one photoinitiator is selected from compounds comprising at least one phosphorous oxide (P═O) group or at least one phosphorous sulfide (P═S) group, and the irradiating of the heterophase medium is effected so that a ratio of an irradiated surface of the heterophase medium to a volume of the heterophase medium is at least 200 m −1 .