| abstract |
Disclosed is a method for manufacturing a urethane (meth) acrylate monomer that has a low acid value and a low content of high-dimensional cross-linked high molecular weight impurities which exhibit insolubility, said method having: a step wherein a first solution, comprising a urethane (meth) acrylate monomer having an acid value exceeding 0.2mgKOH/g and an organic solvent, is brought into contact with a water-containing sorbent, which can absorb acidic components, to obtain a second solution of a urethane (meth) acrylate monomer having an acid value of 0.2mgKOH/g or less, an organic solvent, and an amount of water exceeding 5,000ppm (mass) relative to the urethane (meth) acrylate monomer; a step wherein a third solution is obtained by bringing the second solution into contact with a dehydrating agent, to reduce the amount of water relative to the urethane (meth) acrylate to at most 5,000ppm (mass); and a step wherein the organic solvent is removed from the third solution. |