| 摘要 |
Highly concentrated, finely dispersed, dispersant-poor or dispersant-free preparation of active substances in solid form hardly soluble to insoluble in water, dispersible in aqueous media, process for making these preparations and applications of same. The preparation contains: (a) 40 to 90% by weight of at least one active substance hardly soluble or insoluble in water with a mean particle size less than 5 microns, (b) 10 to 60% by weight of at least one water-soluble salt of an acid resin, and (c) 0 to 50% by weight of further additions such as dispersants, wetting agents or diluents or a mixture of these. The preparation is finely disperse and in the form of a powder or granulate. The preparation can be made as follows: (a) a mixture of active substance(s) and water-insoluble acid resin is treated with a solution of alkalies or amines in water or solvents and the liquid then is removed. (b) a mixture of active substance(s) and water-insoluble acid resin is exposed to the vapors of ammonia or volatile amines. (c) a mixture of active substance finely dispersed in water and an aqueous solution of the acid resin salt is subjected to spray drying. The preparation can be used as an aqueous or aqueous-organic dispersion. |
