| 摘要 |
According to an aspect of the invention, there is provided a hydroxyl group-containing magnetic polymer which is a particulate hydroxyl group-containing magnetic polymer including a magnetic powder and a polymer of ethylenically unsaturated monomers, the content of the magnetic powder being within the range of from 5 to 90% by mass, the ethylenically unsaturated monomers comprising a hydrophilic monomer having a hydroxyl group and a hydrophobic monomer, and the amount of hydroxyl groups in the portion of the hydroxyl group-containing polymer being within the range of from 0.3 to 5.0 mmol/g.
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