Coated stabilized bleach activators, process and washing compositions

A coated stabilized bleaching assistant suitable for use in pulverulent washing and bleaching compositions comprising drop-shaped to globular-shaped particles having an average diameter of 0.01 mm to 2.5 mm, and at least 70% of which have a diameter within the range of 0.1 to 1 mm consisting essentially of 10 to 70% by weight of at least one activator for active oxygen derived from compounds yielding H.sub.2 O.sub.2 in aqueous solutions having an activating action of at least 3 in the Per-Acid Formation Test selected from the group consisting of (1) N-acyl compounds having 2 to 9 carbon atoms in the acyl, (2) O-acyl compounds having 2 to 9 carbon atoms in the acyl, wherein acyl is an organic group of the formula

• R -- CO --
• wherein R designates the hydrocarbon radical with from 1 to 8 carbon atoms, optionally substituted with alkoxy having 1 to 3 carbon atoms, halo, nitro or cyano, (3) carbonic acid esters of the formula
• X -- O -- CO -- -- R
• wherein X is an electron-attracting residue selected from the group consisting of p-carboxyphenyl, p-sulfophenyl and alkoxycarbonyl with 1 to 4 carbon atoms in the alkoxy and R has the above-assigned values, and (4) pyrocarbonic acid esters of C.sub.1 to C.sub.4 alkanols, substantially surrounded by from 30 to 90% by weight of a mixture of (a) from 2 to 10parts by weight of said mixture of acids having substantially from 12 to 24 carbon atoms selected from the group consisting of substantially saturated fatty acids, saturated hydroxy fatty acids, and mixtures thereof, (b) 1 part of weight of said mixture of alcohols selected from the group consisting of substantially saturated hydrocarbon monohydric alcohols having from 10 to 20 carbon atoms, their ethoxylated products, their propoxylated products and mixtures thereof, where the alkoxylated products are water-insoluble and have from 1 to 5 alkoxy units, and (c) from 5 to 25% by weight of said mixture of water-soluble sulfates of alcohols selected from the group consisting of substantially saturated hydrocarbon monohydric alcohols having from 8 to 18 carbon atoms, their ethoxylated products, their propoxylated products and mixtures thereof, where the alkoxylated products have from 1 to 5 alkoxy units.