Patent ID: 6855761
Filing Date: 2005-02-15
Classification: C08F

Abstract:
1. The process for producing monodisperse particles which comprises: a) a step of mixing a polymerizable monomer, an oil-soluble polymerization initiator, a non-aqueous organic solvent and water to form an aqueous emulsion; b) a step of adding an aqueous dispersion of monodisperse polymer seed particles to the aqueous emulsion obtained in step a) to thereby swell the polymer seed particles; and c) a step of polymerizing the polymerizable monomers in the swollen polymer seed particles, wherein d) the polymer seed particles are monodisperse polymer seed particles having a weight average molecular weight of 50,000 or lower, consisting of a poly(meth)acrylic ester) containing at least one substituent selected from the group consisting of straight-chain alkyl groups having 6 or more carbon atoms, alicyclic alkyl groups having 6 or more carbon atoms, phenyl groups, benzyl groups and halogenated alkyl groups having 3 or more carbon atoms; e) the monodisperse particles obtained in the polymerization step c) are formed such that polymer seed particles and the polymer obtained by polymerizing the polymerizable monomers do not cause phase separation; f) the amount of the polymerizable monomer and the non-aqueous organic solvent is 10 to 50,000 times by volume the volume of the polymer seed particles; g) the non-aqueous organic solvent is a halogenated compound; and (h) the non-aqueous organic solvent is added in an amount of 102 to 200 parts by weight per 100 parts by weight of the polymerizable monomer.