| 摘要 |
PURPOSE: Provided are a covered optical fiber which has sufficient flexibility and superior heat-stable with respect to optical transmission property, and a covering composition for optical fiber, which can provide such a covered optical fiber and is able to form cured materials for covering material with superior elastic modulus and heat stability. CONSTITUTION: The covering composition for optical fiber comprises as essential components (A) an unsaturated polyester oligomer having substantially two or more (meth)acryloyl groups in a molecule, wherein a glass transition temperature of a cured substance thereof is 100 to 350 deg.C; (B) at least one oligomer selected from the group consisting of the following components: (B-a) epoxy modified (meth)acrylate oligomer, (B-b) polyether polyol modified (meth)acrylate oligomer, and (B-c) urethane polyether polyol modified (meth)acrylate or urethane polyester polyol modified (meth)acrylate; and (C) a photopolymerization initiator, wherein the covering composition for optical fiber comprises a silicone additive (D) in the composition, and wherein the covering composition for optical fiber comprises a photopolymerizable unsaturated compound (E) in the composition. |
