Patent ID: 11960115
Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC G  C | IPC C  G

Claim 0:
1. An optical fiber comprising:
a glass fiber comprising a core and a cladding; and
a coating resin layer covering the outer periphery of the glass fiber,
wherein an average linear expansion coefficient of the coating resin layer at −50° C. or more and 0° C. or less is 3.3×10−5/° C. or more and less than 9.0×10−5/° C.,
wherein the coating resin layer has a primary resin layer being in contact with the glass fiber and covering the glass fiber and a secondary resin layer covering an outer periphery of the primary resin layer,
the secondary resin layer comprises a cured product of a resin composition comprising a base resin containing an oligomer comprising urethane (meth)acrylate, a monomer, and a photopolymerization initiator, and hydrophobic inorganic oxide particles, and
wherein a content of the inorganic oxide particles is 3% by mass or more and less than 65% by mass based on a total amount of the resin composition.