| abstract |
The porous resin particles are composed of a polymer of a monomer mixture. Here, the monomer mixture may contain 3 to 40% by weight of a mono (meth) acrylic acid ester monomer having an ethylenic unsaturated group only in the (meth) acrylic acid residue and containing at least one of an ether group and an ester group and a hydroxyl group in an alcohol residue, 10 to 69% by weight of another monofunctional vinyl monomer having one ethylenically unsaturated group and 30 to 70% by weight of a polyfunctional vinyl monomer having two or more ethylenically unsaturated groups. |