Resin composition, optical fiber, and method for manufacturing optical fiber

Patent metadata

Field	Value
Publication number	US-12054629-B2
Application number	US-202017269746-A
Country	US
Kind code	B2
Filing date	Apr 30, 2020
Priority date	Jun 14, 2019
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

A resin composition for coating an optical fiber comprises a base resin containing an oligomer, a monomer, and a photopolymerization initiator, and hydrophobic inorganic oxide particles, wherein the oligomer comprises urethane (meth)acrylate and epoxy (meth)acrylate, and the mass ratio of the content of urethane (meth)acrylate to the content of epoxy (meth)acrylate is 0.25 or more.

First claim

The invention claimed is:

1. A resin composition for coating an optical fiber, the resin composition comprising:
a base resin containing an oligomer, a monomer, and a photopolymerization initiator; and
hydrophobic inorganic oxide particles,
wherein the oligomer comprises urethane (meth)acrylate and epoxy (meth)acrylate, and a mass ratio of a content of the urethane (meth)acrylate to a content of the epoxy (meth)acrylate is 0.25 or more, and
wherein an amount of heat of reaction when the resin composition is irradiated with ultraviolet rays at an irradiation intensity of 30 mW/cm 2 for 300 seconds is 100 J/g or more and 275 J/g or less.

2. The resin composition according to claim 1 , wherein the monomer comprises a multifunctional monomer having two or more polymerizable groups.

3. The resin composition according to claim 1 , wherein the inorganic oxide particles are at least one selected from the group consisting of silicon dioxide, zirconium dioxide, aluminum oxide, magnesium oxide, titanium oxide, tin oxide, and zinc oxide.

4. The resin composition according to claim 1 , wherein a content of the inorganic oxide particles is 1% by mass or more and 60% by mass or less based on a total amount of the oligomer, the monomer, and the inorganic oxide particles.

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 covering the glass fiber; and
a secondary resin layer covering the primary resin layer,
wherein the secondary resin layer comprises a cured product of the resin composition according to claim 1 .

6. The optical fiber according to claim 5 , wherein a Young's modulus of the secondary resin layer is 1200 MPa or more and 3500 MPa or less at 23° C.

7. A method for manufacturing an optical fiber, comprising:
an application step of applying the resin composition according to claim 1 to an outer periphery of a glass fiber composed of a core and a cladding; and
a curing step of curing the resin composition by irradiating with ultraviolet rays after the application step.

Assignees

• Sumitomo Electric Industries

Inventors

• Hamakubo Katsushi
• Sohma Kazuyuki

Classifications

• G02B6/02395

  Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture (G02B6/02052, G02B6/02057, G02B6/024, G02B6/032, G02B6/105, G02B6/14 take precedence; coating on fibre gratings G02B6/02104; multilayer core or cladding G02B6/036; reinforcing splice joints G02B6/2558; optical cables, i.e. comprising protective structures external to the protective coating such as a jacket or plural coated optical fibres G02B6/44; coating of glass to obtain optical fibres C03C25/104) · CPC title

• C08F290/067

  Polyurethanes; Polyureas · CPC title

• C03C25/6226

  Ultraviolet · CPC title

• C03C25/285

  Acrylic resins · CPC title

• C03C25/1065 Primary

  Multiple coatings · CPC title