| 摘要 |
PROBLEM TO BE SOLVED: To obtain an additive which makes the chlorine-releasing substance in a chlorine-containing detergent to difficultly decomposable by selecting a copolymer of anα,β-ethylenically unsaturated carboxylic acid or its alkali metal salt, comprising structural units derived from 2-acrylamido-2- methylpropanesulfonic acid or an alkali salt thereof and having a specified weight-average molecular weight. SOLUTION: This additive comprises a copolymer comprising 5-95wt.% 2- acrylamido-2-methylpropanesulfonic acid or an alkali salt thereof and anα,β-unsaturated carboxylic acid (e.g. (meth)acrylic acid) or an alkali salt thereof. The additive should have a weight-average molecular weight of 5,000-250,000. Its average molecular weight depends on the kinds of the unsaturated carboxylic acid used. It is 15,000 or above when (meth)acrylic acid is used, is 6,000 or above when maleic acid is used, and is 10,000 or above when a combination of maleic acid and (meth)acrylic acid is used. The formulating amount of the additive used is 0.2-30wt.%, based on the chlorine-containing detergent. |
