To provide a lens having excellent optical and mechanical characteristics by constituting the lens of a copolymer of a copolymerizable monomer containing a specified compd. and an urethane reaction product of a polyhydric alcohol prepared by reducing a dimer and/or trimer of a higher unsatd. fatty acid and an isocyanate compd. having radical polymerizable unsatd. bonds in the molecule.
An urethane reaction product of a polyhydric alcohol obtd. by reducing a dimer and/or trimer or 11-22C higher unsatd. fatty acid and an isocyanate compd. having radical polymerizable unsatd. bonds in the molecule is subjected to radical polymn. with a copolymerizable monomer containing a styrene deriv. expressed by the formula to constitute the copolymer. In the formula, R is a hydrogen atom or methyl group, X is a hydrogen atom or 1 to 4C alkyl group, Y is a halogen atom, and (a), (b) are integers of 2 to 5 (satisfying a+b≤5).
MACHIDA KATSUICHI
SHOJI MASUHIRO
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