Fiber coating with fast cure speed

Patent metadata

Field	Value
Publication number	US-10377918-B2
Application number	US-201816118706-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Sep 27, 2017
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

A coating composition that exhibits high cure speed is described. The coating composition includes one or more monomers, one or more oligomers, and a photoinitiator. The coating composition further includes a photo sensitizer that acts in cooperation with a photoinitiator to increase cure speed.

First claim

What is claimed is:

1. A coating composition comprising:
an oligomer component, the oligomer component comprising the reaction product of a composition that includes:
a diisocyanate compound;
a hydroxy (meth)acrylate compound; and
a polyol compound,
wherein the diisocyanate compound, the hydroxy (meth)acrylate compound and the polyol compound are present in the molar ratio n:m:p, respectively, where n is in the range from 3.0 to 5.0, m is in the range from 1.50n-3 to 2.50n-5, and p is 2; and

a photosensitizer.

2. The coating composition of claim 1 , wherein said diisocyanate compound comprises a compound having the formula:
O═C═N—R 1 —N═C═O

wherein the group R 1 comprises an alkylene group.

3. The coating composition of claim 2 , wherein the group R 1 comprises a 4,4′-methylenebis(cyclohexyl) group.

4. The coating composition of claim 1 , wherein the hydroxy (meth)acrylate compound comprises a compound having the formula:

wherein the group R 3 comprises an alkylene group.

5. The coating composition of claim 1 , wherein the polyol compound comprises a compound having the formula:

wherein the group R 2 comprises an alkylene group and x is between 40 and 100.

6. The coating composition of claim 1 , wherein n is in the range from 3.4 to 4.6 and m is in the range from 1.60n-3 to 2.40n-5.

7. The coating composition of claim 1 , wherein the reaction product comprises:
a polyether urethane acrylate compound having the molecular formula:

wherein
R 1 , R 2 and R 3 are independently selected from linear alkylene groups, branched alkylene groups, or cyclic alkylene groups;
y is 1, 2, 3, or 4; and
x is between 40 and 100.

8. The coating composition of claim 7 , wherein y is 1 or 2.

9. The coating composition of claim 8 , wherein x is between 60 and 80.

10. The coating composition of claim 7 , wherein R 1 comprises a 4,4′-methylenebis(cyclohexyl) group.

11. The coating composition of claim 10 , wherein R 2 comprises a propylene group and R 3 comprises a linear alkyl group.

12. The coating composition of claim 11 , wherein y=1.

13. The coating composition of claim 7 , wherein the oligomer component further comprises a di-adduct compound having the molecular formula:

14. The coating composition of claim 13 , wherein the di-adduct compound is present in the reaction product in an amount of at least 1.0 wt %.

15. The coating composition of claim 13 , wherein the di-adduct compound is present in the reaction product in an amount of at least 2.35 wt %.

16. The coating composition of claim 1 , further comprising:
a monomer, the monomer comprising a radiation-curable functional group; and
a photoinitiator.

17. The coating composition of claim 16 , wherein the coating composition has a cure speed greater than 60% cure/s when cured at 55° C. with a curing source, the curing source comprising a mercury lamp or an LED.

18. The coating composition of claim 16 , wherein the concentration of the photoinitiator is less than 3.0 wt %.

19. The coating composition of claim 18 , wherein the concentration of the photosensitizer is in the range from 0.25 wt %-1.0 wt %.

20. The cured product of the coating composition of claim 16 .

21. The cured product of claim 20 , wherein the cured product has a Young's modulus less than 0.90 MPa and a tensile toughness greater than 650 mJ/cm 3 .

22. An optical fiber comprising the cured product of the coating composition of claim 16 .

Assignees

• Corning Inc

Inventors

• Chen Yangbin

Classifications

• 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

• C03C25/106

  Single coatings · CPC title

• C08K5/07

  Aldehydes; Ketones · CPC title

• C08K5/01

  Hydrocarbons {(C08K5/0091 takes precedence)} · CPC title

• G02B6/02

  Optical fibres with cladding {with or without a coating} · CPC title