BLEACHING AGENT AND METHOD OF PREPARING THEREOF Russian patent published in 1999 - IPC

FIELD: chemical industry, more particularly particles having nucleus containing peroxide compound capable of liberating hydrogen peroxide or peroxide acids in aqueous solutions, and coating. SUBSTANCE: coating comprises from about 0.05 to about 5 wt % of water-soluble magnesium salt and from 0.05 to about 7 wt % of alkali metal silicate. Particles in nucleus and/or in coating contain from about 0.1 to about 20% of aliphatic organic compound or salt thereof as chelating agent. Said organic compound contains from 2 to 10 carbon atoms and at least one carboxy group. Also described is method of preparing said particles and also washing composition composing these particles. EFFECT: improved properties of the bleaching agent. 22 cl, 3 ex