| 摘要 |
PURPOSE:To treat the surface of the subject molding in ready control and in improved productivity to enable to impart a surface decoration such as plating or coating having excellent appearance and adhesively to the surface, by treating the molding with an acidic solution having a specific composition. CONSTITUTION:A molding of a polyacetal resin composition containing 3-25wt.% of finely powdery calcium carbonate is treated with an acidic aqueous solution comprising 20-60wt.% of sulfuric acid, >=10% of phosphoric acid, <=1% of chloride ions and 20-50% of water. |
