LIQUID-ABSORBING RESIN AND MIDDLE POLAR SOLVENT-CONTAINING GEL

PROBLEM TO BE SOLVED: To obtain the subject resin capable of absorbing and retaining a middle polar solvent without absorbing water and suitably usable for sustained release substrate, etc., by polymerizing a monomer component containing a specific (meth)acrylate-based monomer at a specific ratio. SOLUTION: This absorbing resin is obtained by polymerizing a monomer component containing a monomer composed of at least one kind of compound selected from a group comprising an alkoxyalkyl (meth)acryate and an phenoxyalkyl (meth)acrylate, preferably a monomer of the formula (R1 is H or methyl; R2 is methyl, ethyl, butyl, propyl or phenyl) in an amount of >=85 wt.%. The monomer further contains preferably a crosslinkable monomer for forming three-dimensional crosslinking structure and the crosslinkable monomer is preferably contained in an amount of 0.001-5 mol.% based on the monomer component. Thereby, the middle polar solvent can readily be recovered by absorption and moisture absorption in storing is suppressed, because the resin does not absorb water and storage under dried circumstance is not required.