| abstract |
To provide an absorbent excellent in absorption amount and extremely excellent in absorption rate. A crosslinked polymer particle (S) comprising an ethylenically unsaturated monomer having (meth) acrylic acid (salt) as a main constituent unit and a surface modifier having a surface tension of 10 to 30 dynes / cm. (M) a surface-treated crosslinked polymer particle (X), a surface-treated crosslinked polymer particle comprising a crosslinked polymer particle (S) and a surface modifier (N) having a surface tension of 40 to 80 dynes / cm. (Y) is used as the absorbent. As the surface modifier (M), a surface modifier (M2) containing a hydrocarbon group having a fluorine atom or a surface modifier (M3) containing a siloxane structure is preferable. Further, as the surface modifier (N), a polyalkylene glycol is preferable. [Selection diagram] None |