| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical fiber having high durability and excellent bending resistance even when the fiber is held under tension such as in a wound state on a bobbin. SOLUTION: The optical fiber has at least one coating layer concentrically applied around the core. At least one layer in the coating layers comprises a copolymer composed of an aromatic polyester component (A) by 99 to 10 wt.% and a polyorganosiloxane component (B) by 1 to 90 wt.%. The aromatic polyester component (A) contains at least either polyester (a-1) comprising an aromatic dicarboxylic acid unit and at least one kind of diol unit selected from divalent phenol, lower aliphatic diol and alicyclic diol or polyester (a-2) comprising an aromatic hydroxycarboxylic acid unit, by≥50 mass% in total. The polyorganosiloxane component (B) comprises a compound unit expressed by formula (1). COPYRIGHT: (C)2004,JPO |
