| abstract |
Granular bleaching aids containing bleach activators from the class of the N-acyl and O-acyl compounds and water-soluble, film-forming polymers which serve as pelletizing aids additionally contain 2 to 15% by weight of a polyvalent carboxylic acid, hydroxycarboxylic acid or ether carboxylic acid with 3 to 6 carbon atoms in the molecule as stabilizer. For the preparation of the agents, a homogeneous, dry premix is first prepared which contains the bleach activator, the acid and part or all of the polymeric granulating aid. This mixture is sprayed with water or an aqueous solution of the remaining granulating aid and granulated. |