Patent ID: 11970585
Assignee: NIPPON SHOKUBAI CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC C

Claim 2:
3. The method according to claim 1, the method further includes
a surface crosslinking step vii) of performing surface crosslinking treatment to a water-absorbent resin after removing the fine powder in the classification step v), and
a sizing step viii) of removing a fine powder from a water-absorbent resin after the surface crosslinking step vii),
wherein
a fine powder having a mixing ratio (mass ratio) of the fine powder removed in the classifying step v) and the fine powder removed in the sizing step viii) in a range of 99:1 to 50:50 is used as the fine powder for mixing with the aqueous liquid in the fine powder recycling step vi).