Plastic lens

Abstract

Abstract PURPOSE:To obtain a plastic lens having a high refractive index by using a copolymer which consists essentially of monomers of specific two components and is obtd. in the presence of a radical polymn. initiator. CONSTITUTION:The two components expressed by the formula I (X is halogen except F, (a) is 0-4) and the formula II (R1 is H or an alkyl group, (b) is 0-4, n is 1-4) are used as an essential component and are copolymerized in the presence of a radical polymn. initiator. The copolymer obtd. by incorporating the compd. expressed by the formula I in a 10-90wt% range therein and incorporating the compd. expressed by the foumula II in a 10-50wt% range therein has >=1.57 refractive index. The monomer mixture contg. the above-mentioned radical polymn. initiator is polymerized by using, for example, molds for forming a lens, etc. The polymer obtd. in the above-mentioned way has not only a high refractive index but also excellent mechanical properties, workability, dyeability, formability, chemical resistance, etc. and is usable preferably in the same applications as for inorg. glass, i.e., for a lens of a camera, spectacles, etc. or for a prism, etc.

Inventors

• 👤 Toru Chiba
• 👤 亨 千葉
• 👤 Koji Futaki
• 👤 二木　宏治
• 👤 Morio Takamizawa
• 👤 高味沢　守雄
• 👤 Takao Fujisawa
• 👤 藤沢　貴雄

Bibliographic Details