| 摘要 |
PURPOSE:To obtain a large-diameter optical transmission fiber made of plastic having excellent flexibility and greatly improved environmental resistance characteristics such as resistance to heat, cold, moisture, oscillation and radiation by using a copolymer of diethylene glycol bisallyl carbonate and specific acryl (meth)acrylate as a core component and an org. polymer having the refractive index lower than the refractive index of the core component as a cladding component. CONSTITUTION:The copolymer of the diethylene glycol bisally carbonate and the acryl (meth)acrylate expressed by formula I is used as the core component and the org. polymer having the refractive index lower by >=0.01 than the refractive index of the core component is used as the cladding component. In formula, R1, R2 are a hydrogen atom or hydrocarbon group of 1-1.8C. The optical fiber which has the excellent flexibility and environmental resistance characteristics and exhibits the characteristics thereof particularly when the fiber is made to a large diameter is obtd. Methyl methacrylate yields the particularly good core material as the more specific example of the copolymer expressed by formula. |
