Aqueous solution of the hydrophilic monomer preparation for 20 to 60% is to be emulsified in grease immiscible phase, usually aliphatic series or clicyclic hydrocarbon. To be emulsified in the monomer solution of 30 to 300 parts by weight in the oily phase of 100 parts by weight. The stable lotion is by 0.The surfactant and HLB of 5 to 50 parts by weight are lower than 8. Polymerization is by being added 0.The peroxide initiator of 1 to 5% weight % such as dibenzoyl peroxide, dilauroyl peroxide, di-tert-butyl peroxide, tert-butyl hydroperoxide, dicumenyl peroxide or diacetyl peroxide, according to the monomer of amount. Polymerization 0. is controlled at a temperature of the decomposition of these initiators is lowThe ferrocene and/or ferrocene monophosphate of 1 to 10% parts by weight are used according to the amount of peroxide initiator. Polymerization reaction carries out under an inert atmosphere, at 25 to 75 degrees Celsius of temperature.
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