D1563 radiation curable secondary coating for optical fibers

Patent metadata

Field	Value
Publication number	US-10370557-B2
Application number	US-201515527746-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Nov 19, 2014
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A radiation curable secondary coating composition for optical fiber is described and claimed. This radiation curable secondary coating composition includes component (A) which is a urethane (meth)acrylate and component (B) which is a (meth)acrylate compound with two or more ethylenically unsaturated groups and one or more bisphenol structures; wherein the content of component (B) in the composition is 60-300 mass parts per 100 mass parts of component (A). The liquid secondary coating has a viscosity at 25° C. of from about 0.1 Pa·s to about 15 Pa·s. Films obtained by curing the liquid radiation curable secondary coating composition of the present invention have a Young's modulus of from about 600 MPa to about 500 MPa and the breaking elongation of the cured film is from about to 5% to about 50%.

First claim

The invention claimed is:

1. A radiation curable secondary ting composition for optical fiber which comprises:
(A) at least two different urethane (meth)acrylate oligomers;
(B) a (meth)acrylate compound with two or more ethylenically unsaturated groups and one or more bisphenol structures; and
(C) a (meth)acrylate compound with one or more ethylenically unsaturated groups, said component (C) being other than components (A) and (B);
wherein the content of component (B) in the composition is 100 to 300 mass parts per 100 mass parts of component (A).

2. The radiation curable secondary coating composition claim 1 , wherein the content of component (B) in the composition is from greater than 100 mass parts to less than or equal to 250 mass parts per 100 mass parts of component (A).

3. The radiation curable secondary coating composition of claim 2 , wherein the content of component (B) in the composition is 50 mass % or more of the total quantity of components (B) and (C).

4. The radiation curable secondary coating composition of claim 3 , wherein component (B) is an epoxy di(meth)acrylate comprising a bisphenol structure.

5. The radiation curable secondary coating composition of claim 3 , wherein component (B) is a di(meth)acrylate comprising a bisphenol structure, wherein component (B) is other than an epoxy(meth)acrylate.

6. The radiation curable secondary coating composition of claim 3 , Wherein component (B) is a compound shown by formula (3)

wherein
R 2 is selected from the group consisting of hydrogen atoms, fluorine atoms, and methyl groups;
R 3 are, independently of each other, selected from the group consisting of alkylene groups with 1-4-carbon atoms;
R 4 are, independently of each other, selected from the group consisting of hydrogen atoms and methyl groups;
m1 and m2 are, independently of each other, 0-10;
n1 and n2 are, independently of each other, 0 or 1;
m1+n1 is equal to or greater than 1; and
m2+n2 is equal to or greater than 1.

7. The radiation curable secondary coating composition of claim 6 , wherein both n1 and n2 are 1.

8. The radiation curable secondary coating composition of claim 6 , wherein both n1 and n2 are 0.

9. The radiation curable secondary coating composition of claim 3 , wherein the one or more bisphenol structures in component (B) comprises a bisphenol A structure.

10. The radiation curable secondary coating composition of claim 9 , wherein component (B) is included in the composition in an amount of about 20 mass % to about 80 mass %, relative to all of the components of the radiation curable secondary coating composition.

11. The radiation curable secondary coating composition of claim 9 , wherein component (B) is included in the composition in an amount of about 25 mass % to about 60 mass %, relative to all of the components of the radiation curable secondary coating composition.

12. The radiation curable secondary coating composition of claim 9 , wherein component (B) is included in the composition in an amount of about 27 mass % to about 50 mass %, relative to all of the components of the radiation curable secondary coating composition.

13. The radiation curable secondary coating composition of claim 1 , wherein the radiation curable secondary coating composition has a viscosity at 25° C. from about 0.1 Pa·s to about 15 Pa·s.

14. A secondary coating layer on optical fiber, obtained by curing the radiation curable secondary coating composition of claim 13 .

15. An optical fiber which comprises the secondary coating layer of claim 14 .

16. A film obtained by curing the radiation curable secondary coating composition of claim 13 , having a Young's moduli of from about 600 MPa to about 1500 MPa.

17. A film obtained by curing the radiation curable secondary coating composition of claim 9 , having a breaking elongation from about 15% to about 40%.

18. The radiation curable secondary coating composition of claim 1 , wherein at least one urethane (meth)acrylate oligomer is synthesized from a group of reactants comprising a polypropylene glycol with a molecular weight of about 10,000 g/mol.

19. The radiation curable secondary coating composition of claim 1 , wherein component (C) comprises tripropylene glycol diacrylate.

20. The radiation curable secondary coating composition of claim 12 , further comprising:
(D) a polymerization initiator, wherein the polymerization initiator is present in the radiation curable secondary coating composition in a quantity from 0.1 mass % to 7 mass %; and
optionally, one or more additives.

Assignees

• Dsm Ip Assets Bv

Inventors

• Uchida Hirofumi
• Komiya Zen

Classifications

• C09D133/066

  containing -OH groups · CPC title

• C08G18/4825

  Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title

• C08G18/246

  containing also tin-carbon bonds · CPC title

• 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

• C09D175/16

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