| 摘要 |
To provide a medium suitable for high speed/high resolution, rich in hydrophilicity and resistant to a high concentration aqueous alkaline solution. A medium comprising crosslinked polymer particles containing from 20 to 95 mol% of repeating units derived from a (meth)acryloyl monomer represented by the formula (1) :
wherein R 2 is a hydrogen atom or a C 1-4 alkyl group, R 1 is -NR 3 -R 4 -R 5 or -O-R 4 -R 5 , R 3 is a hydrogen atom or a C 1-4 alkyl group, R 4 is a C 6-15 alkylene group containing an alicyclic ring or a C 4-8 linear alkylene group, and R 5 is a halogen atom, an alcoholic OH group, an amino group, a glycidyl group or an epoxy group. |
