Optical fiber
An optical fiber comprises a glass fiber comprising a core and a cladding, a primary resin layer being in contact with the glass fiber and covering the glass fiber, and a secondary resin layer covering the primary resin layer, wherein the secondary resin layer consists of a cured product of a resin composition comprising a base resin containing a urethane (meth)acrylate oligomer, a monomer, and a photopolymerization initiator and hydrophobic inorganic oxide particles, the content of the inorganic oxide particles is 1% by mass or more and 60% by mass or less based on the total amount of the resin composition, and the glass transition temperature of the secondary resin layer is 60° C. or more and 120° C. or less.
1. An optical fiber comprising a glass fiber comprising a core and a cladding; a primary resin layer being in contact with the glass fiber and covering the glass fiber; and a secondary resin layer covering the primary resin layer,
wherein the secondary resin layer consists of a cured product of a resin composition comprising a base resin containing a urethane (meth)acrylate oligomer, a monomer, and a photopolymerization initiator; and hydrophobic inorganic oxide particles,
wherein a content of the inorganic oxide particles consisting of silicon dioxide is 5% by mass or more and 60% by mass or less based on the total amount of the resin composition,
a glass transition temperature of the secondary resin layer is 60° C. or more and 120° C. or less, and
an average primary particle diameter of the inorganic oxide particles is 200 nm or less.
2. The optical fiber according to claim 1 , wherein the average primary particle diameter of the inorganic oxide particles is 100 nm or less.
3. The optical fiber according to claim 1 , wherein a Young's modulus of the secondary resin layer is 1150 MPa or more and 2700 MPa or less at 23° C.±2° C.
4. An optical fiber comprising:
a glass fiber comprising a core and a cladding;
a primary resin layer being in contact with the glass fiber and covering the glass fiber; and
a secondary resin layer covering the primary resin layer,
wherein the secondary resin layer comprises inorganic oxide particles and a content of the inorganic oxide particles consisting of silicon dioxide is 5% by mass or more and 60% by mass or less based on the total amount of the secondary resin layer,
a glass transition temperature of the secondary resin layer is 60° C. or more and 120° C. or less, and
an average primary particle diameter of the inorganic oxide particles is 200 nm or less.
5. The optical fiber according to claim 4 , wherein the average primary particle size of the inorganic oxide particles is 100 nm or less.
6. The optical fiber according to claim 4 , wherein a Young's modulus of the secondary resin layer is 1150 MPa or more and 2700 MPa or less at 23° C.±2° C.