| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a (meth)acrylic acid (co)polymer permitting to simply and effectively decompose and reduce a hydroquinone compound contained in a monomer. SOLUTION: In manufacturing the (meth)acrylic acid polymer or copolymer by polymerizing a monomer comprising acrylic acid or methacrylic acid, or a salt thereof as an essential ingredient, a hydroquinone compound, a persulfate, a water-soluble metallic salt and hydrogen peroxide are caused to exist in the reaction system, the amount of the persulfate and the water-soluble metallic salt being 15-300 pts.wt. and 0.001-0.05 pt.wt., respectively, each based on 1 pt.wt. of the hydroquinone compound, and the persulfate/hydrogen peroxide molar ratio being 0.01-0.5.
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