Optical fiber and method for manufacturing optical fiber

Patent metadata

Field	Value
Publication number	US-11372155-B2
Application number	US-201816634653-A
Country	US
Kind code	B2
Filing date	Apr 17, 2018
Priority date	Jul 31, 2017
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

An optical fiber comprises a glass fiber; a primary resin layer coating an outer periphery of the glass fiber; and a secondary resin layer coating an outer periphery of the primary resin layer, and a pH of the primary resin layer is greater than a pH of the secondary resin layer.

First claim

The invention claimed is:

1. An optical fiber comprising:
a glass fiber;
a primary resin layer coating an outer periphery of the glass fiber; and
a secondary resin layer coating an outer periphery of the primary resin layer, wherein
a pH of the primary resin layer is greater than a pH of the secondary resin layer.

2. The optical fiber according to claim 1 , wherein a difference between the pH of the primary resin layer and the pH of the secondary resin layer is 1 to 3.

3. The optical fiber according to claim 1 , wherein the pH of the secondary resin layer is 3 to 5.

4. The optical fiber according to claim 1 , wherein the secondary resin layer comprises a cured product of a resin composition containing a urethane oligomer, a monomer, a photopolymerization initiator, and an acidic substance.

5. The optical fiber according to claim 1 , wherein the primary resin layer comprises a cured product of a resin composition containing a urethane oligomer, a monomer, a photopolymerization initiator, and a silane coupling agent.

6. A method for manufacturing an optical fiber comprising a glass fiber, a primary resin layer coating an outer periphery of the glass fiber, and a secondary resin layer coating an outer periphery of the primary resin layer, the method comprising:
a step of curing a resin composition for a primary resin layer by irradiation with ultraviolet rays to form the primary resin layer; and
a step of curing a resin composition for a secondary resin layer by irradiation with ultraviolet rays to form the secondary resin layer, wherein
when the resin composition for the primary resin layer and the resin composition for the secondary resin layer are cured, a pH of the primary resin layer is greater than a pH of the secondary resin layer.

7. The method according to claim 6 , wherein a difference between the pH of the primary resin layer and the pH of the secondary resin layer is 1 to 3.

8. The method according to claim 6 , wherein the pH of the secondary resin layer is 3 to 5.

9. The method according to claim 6 , wherein the resin composition for the secondary resin layer contains a urethane oligomer, a monomer, a photopolymerization initiator, and an acidic substance.

10. The method according to claim 6 , wherein the resin composition for the primary resin layer contains a urethane oligomer, a monomer, a photopolymerization initiator, and a silane coupling agent.

11. The optical fiber according to claim 2 , wherein the pH of the secondary resin layer is 3 to 5.

12. The optical fiber according to claim 11 , wherein the secondary resin layer comprises a cured product of a resin composition containing a urethane oligomer, a monomer, a photopolymerization initiator, and an acidic substance.

13. The optical fiber according to claim 12 , wherein the primary resin layer comprises a cured product of a resin composition containing a urethane oligomer, a monomer, a photopolymerization initiator, and a silane coupling agent.

14. The method according to claim 7 , wherein the pH of the secondary resin layer is 3 to 5.

15. The method according to claim 14 , wherein the resin composition for the secondary resin layer contains a urethane oligomer, a monomer, a photopolymerization initiator, and an acidic substance.

16. The method according to claim 15 , wherein the resin composition for the primary resin layer contains a urethane oligomer, a monomer, a photopolymerization initiator, and a silane coupling agent.

17. The optical fiber according to claim 12 , wherein the resin composition contains 0.10 to 10% by mass of the acidic substance.

18. The optical fiber according to claim 13 , wherein the monomer comprises a heterocycle-containing monomer.

19. The method according to claim 15 , wherein the resin composition contains 0.10 to 10% by mass of the acidic substance.

20. The method according to claim 16 , wherein the monomer comprises a heterocycle-containing monomer.

Assignees

• Sumitomo Electric Industries

Inventors

• Tachibana Kumiko
• Iwaguchi Noriaki
• Fujii Takashi

Classifications

• C08F290/06

  Polymers provided for in subclass C08G · CPC title

• C08K5/54

  Silicon-containing compounds {(C08K5/0091 takes precedence)} · CPC title

• G02B6/44

  Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables (cables incorporating electric conductors and optical fibres {where features relating to the optical fibres are not of interest} H01B11/22) · CPC title

• G02B6/02395 Primary

  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

• C03C25/50

  Coatings containing organic materials only · CPC title