Colored optical fiber

Patent metadata

Field	Value
Publication number	US-9841558-B2
Application number	US-201715405770-A
Country	US
Kind code	B2
Filing date	Jan 13, 2017
Priority date	Jul 29, 2014
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

The present invention provides a two-layer structure colored optical fiber which includes a colored secondary coating layer improved in collectability and separability. The two-layer structure colored optical fiber in an embodiment of the present invention includes a glass optical fiber, a primary coating layer coating the glass optical fiber, and a colored secondary coating layer coating the primary coating layer. The secondary coating layer has such characteristics that a surface cure percentage is 99% or more at an infrared absorption peak of a wave number of 1407 cm −1 and a surface kinetic friction force in Knot Test is less than 0.075 N.

First claim

The invention claimed is:

1. A two-layer structure colored optical fiber comprising:
a glass optical fiber;
a primary coating layer coating the glass optical fiber; and
a colored secondary coating layer coating the primary coating layer, a surface cure percentage of the colored secondary coating layer being 99% or more at an infrared absorption peak of a wave number of 1407 cm −1 , a difference in the surface cure percentage between a portion near a surface of the colored secondary coating layer and a portion near an interface between the primary coating layer and the colored secondary coating layer being 3.0% or less, a surface kinetic friction force in Knot Test of the colored secondary coating layer being less than 0.075 N.

2. The two-layer structure colored optical fiber according to claim 1 , wherein the colored secondary coating layer contains:
an ultraviolet curing resin;
a first photoinitiator having an absorption peak in a short wavelength region of 200 to 350 nm; and
a second photoinitiator having an absorption peak in a long wavelength region of 350 to 450 nm.

3. The two-layer structure colored optical fiber according to claim 2 , wherein the colored secondary coating layer is cured by being irradiated with ultraviolet light emitted from both of a first ultraviolet light source having stronger emission intensity in the short wavelength region than in the long wavelength region and a second ultraviolet light source having stronger emission intensity in the long wavelength region than in the short wavelength region.

4. An optical fiber ribbon in which a plurality of the two-layer structure colored optical fibers according to claim 1 are arranged and coated with a collective coating layer made of a resin.

5. An overcoat optical fiber in which the two-layer structure colored optical fiber according to claim 1 is coated with an overcoat layer made of a resin.

6. A manufacturing method of a two-layer structure colored optical fiber, comprising the steps of:
coating a glass optical fiber with a primary coating layer; and
coating the primary coating layer with a colored secondary coating layer, a surface cure percentage of the colored secondary coating layer being 99% or more at an infrared absorption peak of a wave number of 1407 cm −1 , a difference in the surface cure percentage between a portion near a surface of the colored secondary coating layer and a portion near an interface between the primary coating layer and the colored secondary coating layer being 3.0% or less, a surface kinetic friction force in Knot Test of the colored secondary coating layer being less than 0.075 N.

7. The manufacturing method according to claim 6 , wherein the colored secondary coating layer contains:
an ultraviolet curing resin;
a first photoinitiator having an absorption peak in a short wavelength region of 200 to 350 nm; and
a second photoinitiator having an absorption peak in a long wavelength region of 350 to 450 nm.

8. The manufacturing method according to claim 7 , wherein, the step of coating the primary coating layer with the colored secondary coating layer includes the steps of:
irradiating the colored secondary coating layer with ultraviolet light emitted from a first ultraviolet light source having stronger emission intensity in the short wavelength region than in the long wavelength region; and
irradiating the colored secondary coating layer with ultraviolet light emitted from a second ultraviolet light source having stronger emission intensity in the long wavelength region than in the short wavelength region.

Assignees

• Furukawa Electric Co Ltd

Inventors

• Tanaka Hiroki
• Kasahara Minoru
• Watanabe Junpei
• Suyama Kenichi
• Arashitani Yoshihiro

Classifications

• C09D133/06

  of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical · CPC title

• C03C25/1065

  Multiple coatings · CPC title

• G02B6/4482

  Code or colour marking · CPC title

• G02B6/4403 Primary

  with ribbon structure (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · 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