An aqueous active ingredient composition, the active ingredient or one of them, the water-insoluble polymer P of a type, a surfactant of a type and present in the polymer particles at least in the present invention, 25 ℃ least / having a solubility in water 5g / l or less in 101.325hPa, and an organic active crop protection ingredients kind of polymer was milled at least - in the form of an aqueous dispersion of active component particles, polymers thereof - the active ingredient particles There is in the range of 300~1200nm, is in the range of 310~1000nm preferably, also in the range of 320~800nm more preferably, the aqueous active ingredient composition with an average particle diameter measured by dynamic light scattering method It is, the polymer P is a polymer of ethylenically unsaturated monomers M, based on the total amount of constituent monomers of the polymer M P, M is 0.2 to 10 wt% 0.1 wt%, and more to 7 wt% wt%, and also include mono-ethylenically unsaturated compound M2 at least one of the 5 wt% 0.3 wt%, monoethylenically unsaturated sulfonic acids, M2 mono and mono-ethylenically unsaturated phosphonic acid ethylenically unsaturated phosphoric acid monoester, and also the salts thereof, relates to an aqueous active ingredient composition in which the amount in% by weight based on the monomer M2 in the acid form. To methods for their preparation, the present invention also relates to the use of the active ingredient composition of this type. None [Selection Figure]本発明は、水性活性成分組成物であって、それらの一種又は複数の活性成分が、少なくとも一種の水不溶性ポリマーPと、少なくとも一種の界面活性物質と、ポリマー粒子内に存在し、25℃/101.325hPaにおいて5g/l以下の水中溶解度を有する、少なくとも一種の有機活性作物保護成分とを含む、微粉砕したポリマー-活性成分粒子の水性分散液の形態で存在し、それらのポリマー-活性成分粒子が、300~1200nmの範囲にある、好ましくは310~1000nmの範囲にある、又より好ましくは320~800nmの範囲にある、動的光分散法によって測定した平均粒子直径を有する水性活性成分組成物であり、そのポリマーPが、エチレン性不飽和モノマーMのポリマーであり、Mが、そのポリマーPの構成成分モノマーMの全量に対して、0.1重量%~10重量%の、より詳細には0.2重量%~7重量%の、又特に0.3重量%~5重量%の少なくとも一種のモノエチレン性不飽和化合物M2を含み、M2がモノエチレン性不飽和スルホン酸、モノエチレン性不飽和ホスホン酸及びモノエチレン性不飽和リン酸モノエステルから、且つ又それらの塩から選択され、重量
