Patent ID: 8013049

Claim:
A production method of core-shell type highly liquid absorbent resin particles comprising: (1) a first step in which a particle core portion is formed by suspension polymerizing an aqueous solution (e) containing (meth)acrylic acid, a crosslinking agent (c) and an anionic surfactant (d), wherein the anionic surfactant (d) is in an amount of 1 to 10 parts by mass with respect to 100 parts by mass of the (meth)acrylic acid), in a hydrophobic organic solvent (a) containing a nonionic surfactant (b), the anionic surfactant (d) being represented by the following general formula (I): R′—SO 3 M (I) wherein, R′ represents an alkenyl group having 8 to 30 carbon atoms or a hydroxyalkyl group having 8 to 24 carbon atoms, and M represents an alkaline metal, quaternary ammonium or quaternary amine, and (2) a second step in which a shell portion that covers the particle core portion is formed by suspension polymerizing an aqueous solution (g) containing a water-soluble vinyl polymer (f), having carboxyl groups and polymerizable unsaturated double bonds and having a number average molecular weight of 500 to 10000, in a suspension obtained in the first step.