Stabilizing sodium parcabonate by separately spraying coating solutions of boric acid and a silicate
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsMasayoshi Onda, Akira Ito, Yasuo Hiro, Kenji Umehara, Yuji Yoneyama
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Abstract
A bleaching detergent composition is disclosed which contains granulated sodium percarbonate incorporated therein formed by separately spraying an aqueous boric acid solution and an aqueous alkali metal silicate solution onto sodium percarbonate particles kept in a fluidized state to coat the sodium percarbonate particles with an aqueous solution of the boric acid and the alkali metal silicate.
Claims7
A method for producing a composition comprising granulated sodium percarbonate coated with boric acid and an alkali metal silicate, comprising the steps of separately spraying an aqueous boric acid solution and an aqueous alkali metal silicate solution onto sodium percarbonate particles kept in a fluidized state to coat the particles with an aqueous solution of the boric acid and the alkali metal silicate, wherein the amount of boric acid is 0.3-20% by weight relative to sodium percarbonate and the amount of alkali metal silicate is 0.1 to 10% by weight in terms of SiO.sub.2 relative to sodium percarbonate.
Dependencies are inferred from the claim text.