Abstract: A polycarbonate having high transparency, a high refractive index, low birefringence, moldability and moist heat resistance and an optical member comprising the same. The polycarbonate comprises 98 to 2 mol % of a unit represented by the following formula (I) and 2 to 98 mol % of a unit represented by the following formula (II) and has a specific viscosity measured at 20° C. of a solution prepared by dissolving 0.7 g of the polycarbonate in 100 ml of methylene chloride of 0.12 to 0.40. In the formula (I), R1 to R8 are each independently a hydrogen atom, fluorine atom, chlorine atom, bromine atom, iodine atom, alkyl group having 1 to 6 carbon atoms, aryl group having 6 to 12 carbon atoms, alkenyl group having 2 to 6 carbon atoms, alkoxy group having 1 to 6 carbon atoms or aralkyl group having 7 to 17 carbon atoms.

Abstract: A thermoplastic resin containing a fluorene derivative.

Abstract: A thermoplastic resin containing a fluorene derivative.

Abstract: A thermoplastic resin comprising a fluorene derivative. The thermoplastic resin comprises 30 mole % or more of a recurring unit derived from 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene and has a content of phenyl vinyl ether represented by the following formula (1) of 100 ppm or less.

Abstract: This invention is to provide a polyester carbonate copolymer suitable for an optical lens that has high refractivity and transparency and low birefringence and little optical strain, and optical lenses formed therefrom. This invention is a polyester carbonate copolymer for an optical lens, which comprises 67 to 95 mol % of a unit of the following formula (I) and 33 to 5 mol % of a unit of the following formula (II) and has a specific viscosity of 0.12 to 0.30, wherein Y in the formula (II) is a phenylene group or a naphthalenediyl group.

Abstract: This invention is to provide a polyester carbonate copolymer suitable for an optical lens that has high refractivity and transparency and low birefringence and little optical strain, and optical lenses formed therefrom. This invention is a polyester carbonate copolymer for an optical lens, which comprises 67 to 95 mol % of a unit of the following formula (I) and 33 to 5 mol % of a unit of the following formula (II) and has a specific viscosity of 0.12 to 0.30, wherein Y in the formula (II) is a phenylene group or a naphthalenediyl group.