Flame-retardant optical fiber coating

Patent metadata

Field	Value
Publication number	US-10222547-B2
Application number	US-201615363611-A
Country	US
Kind code	B2
Filing date	Nov 29, 2016
Priority date	Nov 30, 2015
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A flame retardant optical fiber is provided. The flame retardant optical fiber includes a glass core, a cladding surrounding the glass core and a primary coating adhered to the cladding. The flame retardant optical fiber also includes a secondary coating surrounding the primary coating, wherein the secondary coating is formed from a coating composition that is substantially free of an oligomeric component and that comprises a flame retardant composition including a flame retardant material.

First claim

What is claimed is:

1. A flame retardant optical fiber comprising:
a glass core;
a glass cladding surrounding the glass core;
a primary coating adhered to the cladding, the primary coating having a glass transition temperature of less than about 0° C.; and
a secondary coating surrounding the primary coating, wherein the secondary coating is formed from a coating composition that is substantially free of an oligomeric component and that comprises a flame retardant composition comprising a flame retardant material,
wherein the flame retardant material comprises at least one inorganic and halogen-free flame retardant filler, and
wherein the at least one inorganic and halogen-free flame retardant filler is selected from the group consisting of hydrated magnesium calcium carbonate, zinc borate, phosphates and mixtures thereof.

2. The flame retardant optical fiber of claim 1 , wherein the at least one inorganic and halogen-free flame retardant filler has a particle size ranging from about 0.01 μm to about 10 μm.

3. The flame retardant optical fiber of claim 1 , wherein the flame retardant composition comprises the flame retardant material in an amount of greater than about 20 wt. %.

4. The flame retardant optical fiber of claim 1 , wherein the flame retardant composition comprises the flame retardant material in an amount of between about 25 wt. % and about 80 wt. %.

5. The flame retardant optical fiber of claim 1 , wherein the coating composition of the secondary coating comprises flame retardant composition in an amount of between about 30 wt. % and about 95 wt. %.

6. The flame retardant optical fiber of claim 1 , wherein the coating composition of the secondary coating comprises the flame retardant composition in an amount of between about 45 wt. % and about 90 wt. %.

7. The flame retardant optical fiber of claim 1 , wherein the flame retardant composition comprises two or more radiation curable components in an amount of between about 5.0 wt. % to about 95 wt. %.

8. The flame retardant optical fiber of claim 1 , wherein the flame retardant composition comprises two or more radiation curable components in an amount of between about 10 wt. % to about 85 wt. %.

9. The flame retardant optical fiber of claim 1 , wherein the coating composition of the secondary coating comprises a radiation-curable component.

10. The flame retardant optical fiber of claim 1 , wherein the coating composition of the secondary coating comprises a radiation curable component, and wherein the flame retardant composition comprises two or more radiation curable components in an amount of between about 5.0 wt. % to about 95 wt. %.

11. The flame retardant optical fiber of claim 1 , wherein the coating composition of the secondary coating further comprises a photoinitiator.

12. The flame retardant optical fiber of claim 11 , wherein the coating composition of the secondary coating comprises the photoinitiator in an amount of between about 0.50 wt. % to about 5.0 wt. %.

13. The flame retardant optical fiber of claim 1 comprising a Limiting Oxygen Index (LOI) of greater than about 30%.

14. The flame retardant optical fiber of claim 1 comprising a Limiting Oxygen Index (LOI) of greater than about 32%.

15. The flame retardant optical fiber of claim 1 comprising a Limiting Oxygen Index (LOI) of greater than about 34%.

16. The flame retardant optical fiber of claim 1 comprising a time to ignition (TTI) of greater than about 45 seconds.

17. The flame retardant optical fiber of claim 1 comprising a time to ignition (TTI) of greater than about 50 seconds.

18. The flame retardant optical fiber of claim 1 comprising a peak of heat release rate (PHRR) of less than about 1200 kW/m 2 .

19. The flame retardant optical fiber of claim 1 comprising a peak of heat release rate (PHRR) of less than about 1000 kW/m 2 .

20. The flame retardant optical fiber of claim 1 comprising a total heat release (THR) of less than about 80 MJ/m 2 .

21. The flame retardant optical fiber of claim 1 comprising a total heat release (THR) of less than about 60 MJ/m 2 .

22. The flame retardant optical fiber of claim 1 comprising a flame propagation index of less than about 32 kW/m 2 s.

23. The flame retardant optical fiber of claim 1 comprising a flame propagation index of less than about 28 kW/m 2 s.

Assignees

• Corning Inc

Inventors

• Chen Yangbin
• Gallo Emanuela
• Ocampo Manuela

Classifications

• 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

• C09K21/12

  containing phosphorus · CPC title

• C03C25/105

  Organic claddings · CPC title

• C03C2217/228

  Other specific oxides · CPC title

• C03C25/1061

  Inorganic coatings · CPC title