Particles with particle size of not > 10 mu m, comprise: (a) uncharged polyacrylate (b) cationic polyacrylate, which carries positively charged functional groups (c) at least one active substance and (d) optionally other polymers, auxiliaries or additives. An independent claim is also included for producing the particles, comprising (i) preparing a solution of the components (a)-(d) in a small extent with water-miscible solvent or solvent mixture, (ii) dispersing the solution in an aqueous phase, optionally containing additives and solvent or solvent mixture up to saturation to produce a fine, stable emulsion, and (iii) removing the solvent or solvent mixture from the emulsion droplets by evaporation (solvent evaporation process) to obtain an aqueous suspension, or spray-drying to obtain a dry powder and #an agent comprising the particles. ACTIVITY : Antiparasitic Acaricide. The acaricide activity of the agent was tested in vivo in beagle-type dogs (21-30 months old and weighing 8.8-15.5 kg) by spraying the agent containing flumethrin particles (15%) and polymethyl methacrylate on whole body of the dog. The results showed that agent reduces the number of ticks after 50 study days (0) compared to untreated dogs (14). MECHANISM OF ACTION : None given.본 발명은 털에 결합하는 폴리아크릴레이트계 활성 화합물을 포함하는 신규한 입자, 및 의약, 특히 수의과 약품을 제조하기 위한 이 입자들의 용도에 관한 것이다. 입자들은 비하전된 양이온성 폴리아크릴레이트를 포함하고 10 μm 이하의 크기를 갖는다.
