| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject covering material causing no stickiness in high- humidity/temperature and no pistoning, and capable of providing a plastic optical fiber excellent in handling and preservation stability by using a specified polyolefin-based polymer. SOLUTION: This composition comprises a polar group-including olefin-based polymer. The polar group-including polymer is preferably obtained by addition copolymerization or graft copolymerization of a malefic anhydride-modified low molecular polypropylene or a polyolefin-based polymer with a polar group- including unsaturated monomer such as an unsaturated carboxylic acid (derivative), an unsaturated epoxide compound, an unsaturated hydroxy compound. The covering material can be coated on a core (preferably norbornene-based resin)/cladding layer or a core/cladding/primary covering material (gas barrier layer or the like) of the plastic optical fiber. The covered optical fiber can be used for sensors, medical optical fibers or the like. |
