Coated sodium percarbonate particles, a process for their production and detergent, cleaning and bleaching compositions containing them

A process for producing coated sodium percarbonate articles comprising

• forming a coating composition have one or more coating components;
• applying said coating composition to particles consisting essentially of sodium percarbonate;
• and
• forming cores of sodium percarbonate coated by said coating;
• wherein said coating comprises at least one peroxygen-containing boron compound;
• wherein said peroxygen-containing compound comprises the reaction products of hydrogen peroxide and dialkali metal tetraborate, or hydrogen peroxide and alkali metal pentaborate;
• wherein said at least one of said peroxygen containing boron reaction products in a perborax with the general formula Na.sub.2 B.sub.4 O.sub.7 .multidot.m H.sub.2 O wherein n is an integer of 1-4 and m is an integer of 0-9;
• and
• wherein said coating material comprises 1-30% by weight based on sodium percarbonate.

Coated sodium percarbonate particles prepared by a process comprising

• reacting an aqueous solution of aqueous hydrogen peroxide and dialkali metal tetraborate, or aqueous hydrogen peroxide and alkali metal pentaborate to form peroxygen-containing boron reaction products;
• forming a coating material having at least one of said peroxygen-containing boron reaction products
• applying said coating material to particles consisting essentially of sodium percarbonate to form coated sodium percarbonate particles, wherein each of said particles has a core consisting essentially of sodium percarbonate coated by said coating material, wherein said at least one of said peroxygen-containing boron reaction products is a perborax with the general formula Na.sub.2 B.sub.4 O.sub.7 .multidot.m H.sub.2 O.sub.2 .multidot.m H.sub.2 O where n is an integer of 1-4 and m is an integer of 0-9, and wherein said coating material comprises 1-30% by weight based on sodium percarbonate and
• drying said coated particles at a temperature in the range of 30.degree.-90.degree. C.