| 摘要 |
PURPOSE:To obtain a stable reducing type bleaching agent composition, containing respective specific powdery thiourea dioxide, sodium carbonate, sodium hydrogencarbonate and aminocarboxylic acid in a specific proportion and capable of preventing emission of offensive smell by preservation for a long period. CONSTITUTION:The aimed composition obtained by containing (A) thiourea dioxide having preferably 50-500mum particle diameter, (B) sodium carbonate having 50-150mum average particle diameter, (C) sodium hydrogencarbonate having preferably 50-500mum average particle diameter and (D) one or more powdery aminopolycarboxylic acids selected from the group consisting of ethylenediaminetetraacetic acid, nitrilotriacetic acid, iminodiacetic acid, hydroxyethyliminodiacetic acid and diethylenetriaminepentaacetic acid at weight ratio [(B)/(C)] of the components (B) to (C) within the range of 6/1-1/1 and a weight ratio [(B+C)/(D)] of the total of the components (B) and (C) to the component (D) within the range of 20:1-4:1. |
