Optical fiber

Patent metadata

Field	Value
Publication number	US-10054736-B2
Application number	US-201715800304-A
Country	US
Kind code	B2
Filing date	Nov 1, 2017
Priority date	Nov 7, 2016
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

An optical fiber comprises a glass fiber and a coating resin layer covering the glass fiber, the coating resin layer having a primary resin layer and a secondary resin layer, the primary resin layer comprising a cured resin composition obtained by curing a resin composition comprising an oligomer, a monomer, and a photopolymerization initiator, wherein the oligomer is a reaction product of a polyol compound, an isocyanate compound, and a hydroxyl group-containing (meth)acrylate compound; a proportion of a primary hydroxyl group of hydroxyl groups included in the polyol compound is 3.5% or less; and a Young's modulus of the secondary resin layer at −40° C. is 1780 MPa or more.

First claim

What is claimed is:

1. An optical fiber comprising a glass fiber and a coating resin layer covering the glass fiber,
the coating resin layer having a primary resin layer and a secondary resin layer,
the primary resin layer comprising a cured resin composition obtained by curing a resin composition comprising an oligomer, a monomer, and a photopolymerization initiator,
wherein the oligomer is a reaction product of a polyol compound, an isocyanate compound, and a hydroxyl group-containing (meth)acrylate compound,
a proportion of a primary hydroxyl group of hydroxyl groups included in the polyol compound is 3.5% or less; and
a Young's modulus of the secondary resin layer at −40° C. is 1780 MPa or more.

2. The optical fiber according to claim 1 , wherein the proportion of the primary hydroxyl group is 2.5% or less and the Young's modulus is 1970 MPa or more.

3. The optical fiber according to claim 1 , wherein an outer diameter of the optical fiber is 210 urn or less.

4. The optical fiber according to claim 1 , wherein the polyol compound is an aliphatic polyether polyol having a molecular weight of 5000 or less.

5. The optical fiber according to claim 1 , wherein the secondary resin layer comprises a pigment or a dye.

Assignees

• Sumitomo Electric Industries

Inventors

• Iwaguchi Noriaki
• Iida Masuo
• Okamoto Kentaro
• Fujii Takashi

Classifications

• 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

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• C03C25/1065 Primary

  Multiple coatings · CPC title

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• G02B6/036

  core or cladding comprising multiple layers {(multicore optical fibres G02B6/02042; microstructured properties G02B6/02295; omniguide fibres G02B6/023)} · CPC title