| 摘要 |
PROBLEM TO BE SOLVED: To obtain a scale preventive exhibiting an excellent preventing effect, in any water system of high hardness and high salt concentration, or the like. SOLUTION: A diol based copolymer having a diol structural unit (A) having a specific structure, a structural unit (B) having a specific structure, and/or a unit (C) having a specific structure, is indispensable component in this scale preventive.
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