Patent ID: 7399531

Claim:
A liquid absorbing sheet comprising a liquid absorbing resin layer, wherein the liquid absorbing resin layer is obtained by irradiating UV-rays onto a monomer composition to polymerize the monomer composition, the monomer composition containing: a monofunctional monomer component containing a monofunctional monomer capable of forming a homopolymer that is soluble in a nonaqueous solvent used in a nonaqueous electrolyte secondary battery; and a polyfunctional monomer component; wherein: the nonaqueous solvent contains at least one of dimethyl carbonate, propylene carbonate and ethylene carbonate; the monofunctional monomer is benzyl acrylate, N-vinyl-2-pyrrolidone, imide acrylate, acryloyl morpholine, phenoxyethyl acrylate, N,N-diethylacrylamide, methoxypolyethylene glycol acrylate, tetrahydrofurfuryl acrylate, or phenoxypolyethylene glycol acrylate; the liquid absorbing resin layer has a crosslink density of 0.0001 to 0.17; the monofunctional monomer is contained at 20 mol % in the monofunctional monomer component; and the polyfunctional monomer component is selected from the group consisting of hydroxyl pivalic acid neopentyl glycol diacrylate, polyethylene glycol diacrylate (ethylene oxide-added mol number (n) =14), bisphenol A diacrylate, phenyl glycidyl ether acrylate, and hexamethylene diisocyanate urethane prepolymer.