To obtain non-cross-linked (co)polymer particles hardly generating polymer scales by suspending and dispersing a specific monomer in water in the presence of a specific compound at a specific temperature and subsequently polymerizing the monomer at a specific temperature or lower.
The (co)polymer particles are obtained by suspending and dispersing (A) a hydrophobic vinyl monomer in a particle state in the presence of (B) polyvinyl alcohol in (C) water at a lower temperature than the clouding point of the component B and subsequently polymerizing the particulate monomer at a higher temperature than the clouding point of the component B. The clouding point of the component B is a phase separation critical temperature wherein the polymer is coagulated and insolubilized to generate the cloudy dispersion, when the aqueous solution of the component B [1 wt.% concentration] is heated. The clouding point of the component B (1 wt.% aqueous solution) is preferably 30-60°C. The component A preferably includes aromatic monovinyl monomers, (meth)acrylonitrile, alkyl 1-20C (meth)acrylates and halogeno monovinyl monomers, etc.
KODAMA YOICHI
MUROI MASAYUKI
SUMIKAWA NAOKI
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