Sumitomo Electric Industries, Limited

Kazuto Saito

Tomoyuki Hattori

Tetsuya Haruna

Wataru Sakurai

Mitsuaki Tamura

Kazumasa Oishi

Kazunori Tanaka

When a glass fiber and an inner fiber coating layer are to be attached to a connector by removing an outer fiber coating layer while leaving the inner fiber coating layer as it is, a collective coating and the outer fiber coating layer can be removed at a stretch so that the inner fiber coating layer can easily and satisfactorily be exposed. In the ultraviolet curable resin coating layer of a coated optical fiberof an optical fiber ribbonfor wiring of equipment, the inner fiber coating layerhas a Young's modulus of 600 MPa to 1000 MPa, and the outer fiber coating layerhas a Young's modulus of 10 MPa to 300 MPa. The material of the outer fiber coating layeris made by mixing 100 weight parts of base resin, 1-30 weight parts of silicone-based additive, and 0.5 to 40 weight parts of long chain fatty acid ester compound, wherein the base resin is a material made of a urethane metha acrylate oligomer, a mono-functional or multi-functional reactive dilution monomer, and an optical initiator.

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Yokohama, Japan

Kazuto Saito