| abstract |
PROBLEM TO BE SOLVED: To provide an economical and thermostable water-containing contact with significantly reduced surface accumulation due to charges contained in proteins, lipids, cell fragments and other wastes in tears. Provide a lens. SOLUTION: A radical polymerizable monomer having a quaternary ammonium salt content of 0.5 to 49 parts by weight and a (meth) acryloyloxyethyl carboxylic acid represented by the general formula (1) is used. 0.5 to 49 parts by weight, A polymer obtained by polymerizing a monomer mixture consisting of 8-97 parts by weight of hydroxyethyl methacrylate and 2-91 parts by weight of a monomer copolymerizable therewith, comprising a quaternary ammonium ion and a carboxyl ion; A hydrated contact lens having excellent thermal stability in which a quaternary ammonium ion and a carboxyl ion in which the counter ions are deacidified or desalted are present in the form of zwitter ions. |