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US 12,612,487 B2Granted
Cycloolefin copolymer and hydrogenated product thereof, and optical element
AssigneeZeon Corporation
InventorsSatoshi Yamada, Hironari Sudeji
Life of this patent
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Abstract
Provided is a resin that can simultaneously achieve a high refractive index, high heat resistance, and low birefringence. A hydrogenated cycloolefin copolymer is obtained through hydrogenation of a cycloolefin copolymer that includes a structural unit derived from 1-naphthylnorbornene and a structural unit derived from 2-naphthylnorbornene, wherein an average endo isomer ratio of the 1-naphthylnorbornene and the 2-naphthylnorbornene is 50 mol % or more. The hydrogenated cycloolefin copolymer is suitable for use as a material of an optical element such as an optical lens.
Claims8
A cycloolefin copolymer comprising:
- a structural unit derived from 1-naphthylnorbornene;
- and a structural unit derived from 2-naphthylnorbornene, wherein
- an average endo isomer ratio of the 1-naphthylnorbornene and the 2-naphthylnorbornene is 50 mol % or more.
Dependencies are inferred from the claim text.