Ultraviolet-curable resin composition and optical fiber

Patent metadata

Field	Value
Publication number	US-2019127605-A1
Application number	US-201816170449-A
Country	US
Kind code	A1
Filing date	Oct 25, 2018
Priority date	Oct 26, 2017
Publication date	May 2, 2019
Grant date	—

Abstract

In an ultraviolet-curable resin composition for an optical fiber coating, the polarity parameter ET(30) of the resin composition is 47 to 61.

First claim

What is claimed is:

1 . An ultraviolet-curable resin composition for an optical fiber coating, wherein a polarity parameter E T (30) of the resin composition is 47 to 61.

2 . The ultraviolet-curable resin composition according to claim 1 , wherein the polarity parameter E T (30) is determined by dissolving a betaine dye having a structure represented by a following formula (1) in the resin composition, measuring a maximal absorption wavelength λ max, and calculating according to the following expression:
E T (30)=28591/λ max [nm].

3 . The ultraviolet-curable resin composition according to claim 1 , wherein the polarity parameter E T (30) is 51 to 61.

4 . The ultraviolet-curable resin composition according to claim 1 , comprising a urethane (meth)acrylate oligomer, a monomer, and a photopolymerization initiator.

5 . The ultraviolet-curable resin composition according to claim 4 , wherein the monomer comprises a nitrogen-containing monomer, and a content of the nitrogen-containing monomer is 15% by mass or less based on a total amount of the resin composition.

6 . The ultraviolet-curable resin composition according to claim 5 , wherein the nitrogen-containing monomer comprises a heterocycle-containing (meth)acrylate or an N-substituted amide monomer.

7 . An optical fiber comprising:
an optical transmission medium comprising a core and a cladding; a primary resin layer being in contact with the optical transmission medium and covering the optical transmission medium; and a secondary resin layer covering the primary resin layer, wherein the secondary resin layer is a cured product of the ultraviolet-curable resin composition according to claim 1 .

8 . The optical fiber according to claim 7 , wherein the polarity parameter E T (30) is determined by dissolving a betaine dye having a structure represented by a following formula (1) in the ultraviolet-curable resin composition, measuring a maximal absorption wavelength λ max, and calculating according to the following expression:
E T (30)=28591/λ max [nm].

9 . The optical fiber according to claim 7 , wherein the polarity parameter E T (30) is 51 to 61.

10 . The optical fiber according to claim 7 , wherein the ultraviolet-curable resin composition comprises a urethane (meth)acrylate oligomer, a monomer, and a photopolymerization initiator.

11 . The optical fiber according to claim 10 , wherein the monomer comprises a nitrogen-containing monomer, and a content of the nitrogen-containing monomer is 15% by mass or less based on a total amount of the resin composition.

12 . The optical fiber according to claim 11 , wherein the nitrogen-containing monomer comprises a heterocycle-containing (meth)acrylate or an N-substituted amide monomer.

Assignees

• Sumitomo Electric Industries

Inventors

• Homma Yuya
• Sohma Kazuyuki
• Shimada Kensaku

Classifications

• C09B57/00

  Other synthetic dyes of known constitution · CPC title

• C09B69/001

  Dyes containing an onium group attached to the dye skeleton via a bridge · CPC title

• C09D175/14 Primary

  Polyurethanes having carbon-to-carbon unsaturated bonds · CPC title

• C08G18/672

  Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen · CPC title

• C08G18/4845

  containing oxypropylene or higher oxyalkylene end groups · CPC title