摘要：

Provided is a polymer-based detergent builder which is capable of effectively suppressing deposition of a surfactant, and effectively preventing soil re-deposition, even in washing using high hardness water. Specifically, the present invention solves the above problem by a graft polymer with a hydrocarbon group made by graft polymerization of monomer components containing a hydrophilic monomer having an anionic group or a hydroxyl group, on a polyoxyalkylene-based compound represented by the following formula (1)

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