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US 12,643,973 B2Granted
Resin composition, optical fiber, and method for producing optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorYuya Homma
Life of this patent
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Abstract
A resin composition for secondary coating of an optical fiber includes a photopolymerizable compound including a urethane (meth)acrylamide, and a photopolymerization initiator. The urethane (meth)acrylamide has a (meth)acrylamide group at at least one end of a urethane bond.
Claims9
An optical fiber comprising:
- a glass fiber including a core and a cladding;
- a primary resin layer covering the glass fiber so as to be in contact with the glass fiber;
- and
- a secondary resin layer covering the primary resin layer;
- wherein the secondary resin layer includes a cured product of a resin composition for secondary coating of the optical fiber, the resin composition comprising:
- a photopolymerizable compound including a urethane (meth)acrylamide;
- and
- a photopolymerization initiator,
- wherein the urethane (meth)acrylamide has a (meth)acrylamide group at at least one end of a urethane bond, and
- wherein a Young's modulus of the secondary resin layer is 800 MPa to 3000 MPa at 23° C. +2° C.
7 more elements
A method for producing an optical fiber, the method comprising:
- applying a resin composition to an outer periphery of a glass fiber including a core and a cladding;
- and
- curing the resin composition by ultraviolet irradiation after the applying, wherein the resin composition comprises:
- a photopolymerizable compound including a urethane (meth)acrylamide;
- and
- a photopolymerization initiator,
- wherein the urethane (meth)acrylamide has a (meth)acrylamide group at at least one end of a urethane bond, and
- wherein a Young's modulus of a cured product of the resin composition is 800 MPa to 3000 MPa at 23° C.±2° C.
5 more elements
Dependencies are inferred from the claim text.