Patent ID: 7816445

Claim:
A production method for a hydrophilic polymer, comprising the steps of: (1) mixing a solution containing a hydrophilic monomer and a compound which disperses in the solution while the solution is stirred, so as to prepare a dispersion solution of the compound; and (2) polymerizing the hydrophilic monomer in the solution, and heating the dispersion solution by heat of polymerization generated by the polymerization, so as to dissolve at least a part of the compound dispersed therein, wherein the compound which disperses in the solution containing the hydrophilic monomer is a compound which is dispersible in an aqueous solution having a temperature of 0° C. to 40° C., and wherein the compound which disperses in the solution containing the hydrophilic monomer has a solubility of 2 g or more with respect to 100 g of water having a temperature of 60° C.