发明名称 |
OPTICAL LENS |
摘要 |
Disclosed is an optical lens which can be produced by injection molding on an industrial scale and which has a high refractive index, a low Abbe's number, a low birefringence index, a high transparency and a high glass transition temperature. The optical lens can be produced by injection molding of a polycarbonate resin (preferably having a reduced viscosity of 0.2 dl/g or higher and a glass transition temperature of 120 to 160°C), wherein the polycarbonate resin is produced by reacting a diol component comprising 99 to 51 mol% of 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene and 1 to 49 mol% of bisphenol A with a carbonate diester. It becomes possible to produce an optical lens preferably having a refractive index of 1.60 to 1.65, an Abbe's number of 30 or smaller, a birefringence index of 300 nm or lower and an all light transmittance of 85.0% or higher. |
申请公布号 |
EP2034337(B1) |
申请公布日期 |
2013.07.31 |
申请号 |
EP20070744595 |
申请日期 |
2007.06.01 |
申请人 |
MITSUBISHI GAS CHEMICAL COMPANY, INC. |
发明人 |
KATO, NORIYUKI;YAMADA, TOSHIAKI;KOSHIISHI, EIJI;YOSHIDA, SHU |
分类号 |
G02B3/00;C08G64/16;G02B1/04 |
主分类号 |
G02B3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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