Stable slurry-coated sodium percarbonate, process for producing the same and bleach detergent composition containing the same

A process for producing a stable sodium percarbonate which comprises a surface coating step of sodium percarbonate with an aqueous coating slurry, said surface coating step being conducted with a coating agent selected from the group (A) consisting of boric acids, borates and alkali metal silicates and a coating agent selected from the group (B) consisting of carbonates, hydrogencarbonates and alkali metal or alkaline earth sulfates, wherein at least one coating agent selected from the group consisting of coating agents belonging to groups (A) and (B) is used as a dispersoid of the aqueous coating slurry, the total amount of the coating agents belonging to groups (A) and (B) is 0.1 to 30% by weight based on the amount of sodium percarbonate and the weight ratio of coating agents (A) to (B) is between 1/20 and 20/1.

A stable sodium percarbonate produced by coating the percarbonate with a coating agent selected from the group (A) consisting of boric acids, borates and alkali metal silicates and a coating agent selected from the group (B) consisting of carbonates, hydrogencarbonates and alkali metal or alkaline earth sulfates, wherein at least one coating agent selected from the group consisting of coating agents belonging to groups (A) and (B) is used in the form of an aqueous coating slurry thereof, the total amount of the coating agents belonging to groups (A) and (B) is 0.1 to 30% by weight based on the amount of sodium percarbonate and the weight ratio of coating agents (A) to (B) is between 1/20 and 20/1.

A stable sodium percarbonate produced by coating the percarbonate with an aqueous coating slurry comprising a coating agent selected from the group (A) consisting of boric acids, borates and alkali metal silicates, a coating agent selected from the group (B) consisting of carbonates, hydrogencarbonates and alkali metal or alkaline earth sulfates, and water, and having a water content of 30 to 90% by weight based on the entire quantity of the aqueous coating slurry, and at least one coating agent selected from the group consisting of coating agents belonging to groups (A) and (B) being used as a dispersoid in the aqueous coating slurry, the total amount of the coating agents belonging to groups (A) and (B) is 0.1 to 30% by weight based on the amount of sodium percarbonate and the weight ratio of coating agents (A) to (B) is between 1/20 and 20/1.

A stable sodium percarbonate produced by coating the percarbonate with an aqueous coating slurry containing, as a dispersoid of the aqueous coating slurry, at least one coating agent selected from the group consisting of coating agents belonging to group (A) consisting of boric acids, borates and alkali metal silicates, or coating agents belonging to group (B) consisting of carbonates, hydrogencarbonates and alkali metal or alkaline earth sulfates, and an aqueous coating solution containing, as a solute of the aqueous coating solution, at least one coating agent selected from the group consisting of coating agents belonging to the other groups (A) or (B), the total amount of the coating agents belonging to groups (A) and (B) is 0.1 to 30% by weight based on the amount of sodium percarbonate and the weight ratio of coating agents (A) to (B) is between 1/20 and 20/1.

A stable sodium percarbonate produced by coating the percarbonate with a coating agent composition(s) containing at least one coating agent selected from the group (A) consisting of boric acids, borates and alkali metal silicates and at least one coating agent selected from the group (B) consisting of carbonates, hydrogencarbonates and alkali metal or alkaline earth sulfates, and at least one of the coating agent composition(s) being in the form of an aqueous coating slurry of at least one coating agent selected from the group consisting of coating agents belonging to groups (A) and (B), the total amount of the coating agents belonging to groups (A) and (B) is 0.1 to 30% by weight based on the amount of sodium percarbonate and the weight ratio of coating agents (A) to (B) is between 1/20 and 20/1.

A bleach detergent composition comprising detergent component particles containing a cleaning effective amount of a surfactant as an essential component and a bleaching effective amount of a stable sodium percarbonate produced by a process which comprises a step of treating sodium percarbonate on the surface with at least one coating agent selected from the group (A) consisting of boric acids, borates and alkali metal silicates and at least one coating agent selected from the group (B) consisting of carbonates, hydrogencarbonates and alkali metal or alkaline earth sulfates, wherein at least one coating agent selected from the group consisting of coating agents belonging to groups (A) and (B) is present in the form of an aqueous coating slurry thereof, the total amount of the coating agents belonging to groups (A) and (B) is 0.1 to 30% by weight based on the amount of sodium percarbonate and the weight ratio of coating agents (A) to (B) is between 1/20 and 20/1.