Resin composition, secondary coating material for optical fiber, optical fiber, and method for manufacturing optical fiber
The resin composition according to an aspect of the present disclosure is a resin composition containing a photopolymerizable compound comprising urethane (meth)acrylate and a polyrotaxane, and a photopolymerization initiator, and the content of the polyrotaxane is 0.05% by mass or more and 11% by mass or less based on the total amount of the photopolymerizable compound.
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 coating the glass fiber; and
a secondary resin layer coating the primary resin layer,
wherein the secondary resin layer comprises a cured product of a resin composition comprising a photopolymerizable compound comprising urethane (meth)acrylate and a polyrotaxane, and a photopolymerization initiator, wherein a content of the polyrotaxane is 0.05% by mass or more and 11% by mass or less based on a total amount of the photopolymerizable compound.
2. The optical fiber according to claim 1 , wherein the polyrotaxane comprises a cyclic molecule having at least one ultraviolet curable group selected from the group consisting of an acryloyl group, a methacryloyl group, and a vinyl group.
3. The optical fiber according to claim 1 , wherein the polyrotaxane comprises a linear polymer having an adamantyl group.
4. The optical fiber according to claim 1 , further containing an inorganic oxide.
5. The optical fiber according to claim 2 , wherein the polyrotaxane comprises a linear polymer having an adamantyl group.
6. The optical fiber according to claim 2 , further containing an inorganic oxide.
7. The optical fiber according to claim 3 , further containing an inorganic oxide.
8. The optical fiber according to claim 5 , further containing an inorganic oxide.
9. A method for manufacturing an optical fiber, comprising:
an application step of applying a resin composition comprising a photopolymerizable compound comprising urethane (meth)acrylate and a polyrotaxane, and a photopolymerization initiator, wherein a content of the polyrotaxane is 0.05% by mass or more and 11% by mass or less based on a total amount of the photopolymerizable compound onto an outer periphery of a glass fiber comprising a core and a cladding; and
a curing step of curing the resin composition by irradiation with ultraviolet rays after the application step.
10. The method for manufacturing an optical fiber according to claim 9 , wherein the polyrotaxane comprises a cyclic molecule having at least one ultraviolet curable group selected from the group consisting of an acryloyl group, a methacryloyl group, and a vinyl group.
11. The method for manufacturing an optical fiber according to claim 9 , wherein the polyrotaxane comprises a linear polymer having an adamantyl group.
12. The method for manufacturing an optical fiber according to claim 9 , wherein the resin composition further contains an inorganic oxide.