Optical fiber
An optical fiber includes an optical transmission medium having a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, wherein the primary resin layer comprises a cured product of an ultraviolet light curable resin composition comprising a urethane (meth)acrylate oligomer, a monomer and a photopolymerization initiator, and a compound containing phosphorus and tin as constituent atoms; and a Young's modulus of the primary resin layer is 0.5 MPa or less at 23° C.
1. An optical fiber including:
an optical transmission medium having a core and a cladding;
a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and
a secondary resin layer coating the primary resin layer,
wherein the primary resin layer comprises a cured product of an ultraviolet light curable resin composition comprising a urethane (meth)acrylate oligomer, a monomer and a photopolymerization initiator, and a compound containing phosphorus and tin as constituent atoms; and
a Young's modulus of the primary resin layer is 0.25 MPa or less at 23° C.
2. The optical fiber according to claim 1 , wherein the photopolymerization initiator comprises 2,4,6-trimethylbenzoyldiphenylphosphine oxide.
3. The optical fiber according to claim 1 , wherein the compound containing phosphorus and tin is a reaction product between at least one phosphorus compound selected from the group consisting of a compound represented by formula (1a), a compound represented by formula (1b), and a compound represented by formula (1c); and an organotin compound:
wherein R 1 , R 2 , R 3 , and R 4 each independently represent an alkyl group, an alkenyl group, or an aryl group.
4. The optical fiber according to claim 3 , wherein the phosphorus compound comprises at least one selected from the group consisting of diphenylphosphinic acid, phenylphosphinic acid, and phenylphosphonic acid.
5. The optical fiber according to claim 3 , wherein the organotin compound comprises at least one selected from the group consisting of dibutyltin dilaurate and dibutyltin diacetate.
6. The optical fiber according to claim 1 , wherein a difference between a glass transition temperature of the primary resin layer and a glass transition temperature of the secondary resin layer is 150° C. or less.
7. An optical fiber including:
an optical transmission medium having a core and a cladding;
a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and
a secondary resin layer coating the primary resin layer,
wherein the primary resin layer comprises a cured product of an ultraviolet light curable resin composition comprising a urethane (meth)acrylate oligomer, a monomer, a photopolymerization initiator and an amine compound, and a compound containing phosphorus and tin as constituent atoms; and
a Young's modulus of the primary resin layer is 0.5 MPa or less at 23° C.
8. The optical fiber according to claim 7 , wherein the photopolymerization initiator comprises 2,4,6-trimethylbenzoyldiphenylphosphine oxide.
9. The optical fiber according to claim 7 , wherein the compound containing phosphorus and tin is a reaction product between at least one phosphorus compound selected from the group consisting of a compound represented by formula (1a), a compound represented by formula (1b), and a compound represented by formula (1c); and an organotin compound:
wherein R 1 ,R 2 , R 3 , and R 4 each independently represent an alkyl group, an alkenyl group, or an aryl group.
10. The optical fiber according to claim 9 , wherein the phosphorus compound comprises at least one selected from the group consisting of diphenylphosphinic acid, phenylphosphinic acid, and phenylphosphonic acid.
11. The optical fiber according to claim 9 , wherein the organotin compound comprises at least one selected from the group consisting of dibutyltin dilaurate and dibutyltin diacetate.
12. The optical fiber according to claim 7 , wherein a difference between a glass transition temperature of the primary resin layer and a glass transition temperature of the secondary resin layer is 150° C. or less.