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AssigneesFurukawa Electric Co., Ltd., Teijin Chemicals, Ltd.
InventorsMasaki Nishiguchi, Toshimasa Tokuda
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There is provided an aromatic polycarbonate copolymer obtained by reacting a dihydric phenol component comprising mainly 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane and 9,9-bis(4-hydroxyphenyl)fluorene or 1,1-bis(4-hydroxyphenyl)-1-phenylethane in a prescribed ratio with a carbonate precursor substance. This aromatic polycarbonate copolymer has a specific viscosity in a limited range. The aromatic polycarbonate copolymer is excellent in optical characteristics, transparency, hydrolysis resistance, heat resistance, oxidation resistance, and heat stability and good in moldability, and is suitable for a plastic optical waveguide that is small in transmission loss and excellent in heat resistance.
A plastic optical waveguide, which comprises a plastic optical waveguide whose core layer comprises an aromatic poycarbonate copolymer that is obtained by reacting a dihydric phenol component, comprising 53 to 99.5 mol % of (A) 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane and 47 to 0.5 mol % of (B) 9,9-bis(4-hydroxyphenyl)fluorene, with a carbonate precursor substance;
A plastic optical waveguide, which comprises a plastic optical waveguide whose core layer comprises an aromatic poycarbonate copolymer that is obtained by reacting a dihydric phenol component, comprising 15 to 99.5 mol % of (A) 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane and 85 to 0.5 mol % of (C) 1,1-bis(4-hydroxyphenyl)-1-phenylethane, with a carbonate precursor substance;
Dependencies are inferred from the claim text.