prov:value
| - s polyvinylpyrrolidone, polyvinylpyridine and the like, polyethyeleneimine, a polycarboxylic acid (such as poly(meth)acrylic acid, polyitaconic acid and the like), a copolymer and a salt (an alkali metal salt, such as sodium, potassium and the like, a water soluble metallic salt formed by substituting the entire or a part of carboxyl groups with an alkaline earth metal, such as calcium, magnesium,
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