| 摘要 |
PURPOSE:To obtain an optical fiber with small loss and superior light transmitting characteristics in the visible light region, by adding a chain transfer agent and an azo compound to a methyl methacrylate (MMA) monomer under tightly sealed conditions in the absence of oxygen, polymerizing the monomer, and melt-spinning the resulting MMA polymer to form a core fiber. CONSTITUTION:An MMA-base polymer is used as a core, and a sheath of a synthetic polymer having a lower refractive index than the core is formed around the core to manufacture a plastic optical fiber. At this time, an MMA monomer is purified in a tightly sealed system, and to the monomer in the absence of oxygen are added a chain transfer agent and an azo compound represented by the formula (where each of R1-R3 is straight or branched chain 1-5C alkyl or cycloalkyl, and the total number of C of R1-R3 is <=7) as a polymn. initiator under tightly sealed conditions. The resulting core polymer is melt-spun in the tightly sealed state to form the core fiber. |
