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Abstract

This invention provides an optical copolymer which is excellent in balance among high transmittance, high heat resistance, low birefringent property, and mechanical strength, and an optical molded article comprising the optical copolymer. The optical copolymer comprises 50 to 80% by mass of methyl methacrylate units, 10 to 20% by mass of units derived from a specific lactone compound, and 10 to 30% by mass of trifluoroethyl methacrylate units. The mass ratio of the trifluoroethyl methacrylate units is in the range of 0.5 to 2.0 when the mass of the units derived from the specific lactone compound is presumed to be 1, and the glass transition temperature is 120° C. or above. The optical copolymer is suitable for objective lenses, prisms, condenser lenses, diffraction gratings, collimator lenses and sensor lenses.

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First Claim