Resin composition, optical fiber, and method for producing optical fiber
A resin composition for primary coating of an optical fiber contains a photopolymerizable compound, a photopolymerization initiator, and a silane coupling agent, wherein the photopolymerizable compound contains a urethane (meth)acrylate and an ultraviolet curable polyrotaxane, 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 . A resin composition for primary coating of an optical fiber, comprising:
a photopolymerizable compound;
a photopolymerization initiator; and
a silane coupling agent,
wherein the photopolymerizable compound comprises a urethane (meth)acrylate and an ultraviolet curable polyrotaxane, and
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 resin composition 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 resin composition according to claim 1 , wherein the polyrotaxane comprises a linear polymer having an adamantyl group.
4 . The resin composition according to claim 1 , further comprising an inorganic oxide particle.
5 . 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 primary resin layer comprises a cured product of the resin composition according to claim 1 .
6 . A method for manufacturing an optical fiber, comprising:
an application step of applying the resin composition according to claim 1 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.
7 . The resin composition according to claim 2 , wherein the polyrotaxane comprises a linear polymer having an adamantyl group.
8 . The resin composition according to claim 2 , further comprising an inorganic oxide particle.
9 . The resin composition according to claim 3 , further comprising an inorganic oxide particle.