| abstract |
A porous copolymer particle having a particle size of from 0.1 to 2,000 mu m and a permanent pore size of from 2 to 800 nm comprising (i) a monomer containing from 5 to 60 wt% of a monomer (A) selected from N-vinylcarboxylic acid amides represented by formula (I): <CHEM> wherein R<1> represents a hydrogen atom or a methyl group, and R<2> represents a hydrogen atom, a C1-C8 alkyl group, a phenyl group or a phenyl group substituted with a methyl group or an ethyl group and (ii) from 40 to 95 wt% of a copolymerizable monomer (B) which contains a crosslinking monomer. |