Polyester carbonate copolymer for optical lens and optical lens
US8378055B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Jul 16, 2010 |
| Grant date | Feb 19, 2013 |
| Priority date | — |
| Expiry date | Jul 16, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/041
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.