Flame retardant nonwoven fabric, formed product, and composite stack

Patent metadata

Field	Value
Publication number	US-9963810-B2
Application number	US-201414899687-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jun 28, 2013
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

With a nonwoven fabric made of fibers mainly composed of amorphous polyetherimide having a melt viscosity at 330° C. from 100 to 3000 Pa·s and an average fiber diameter from 1 to 10 μm, a nonwoven fabric which is excellent in flame retardancy and can have a small thickness within a range from 5 to 900 μm with strength being maintained because of its denseness can be provided.

First claim

The invention claimed is:

1. A nonwoven fabric, comprising fibers mainly comprising an amorphous polyetherimide having a melt viscosity at 330° C. from 100 to 3000 Pa·s and an average fiber diameter from 1 to 10 μm,
wherein the nonwoven fabric has an air permeability of 120 cc/cm 2 /sec or less.

2. The nonwoven fabric according to claim 1 , which is obtained by a melt blown method or a spunbond method.

3. A composite stack, comprising the nonwoven fabric of claim 1 .

4. A formed product obtained by heating the nonwoven fabric of claim 1 and thermally fusing some or all of amorphous polyetherimide fibers.

5. A composite stack, comprising the formed product of claim 4 .

6. A composite stack, comprising the nonwoven fabric of claim 2 .

7. The nonwoven fabric according to claim 1 , having an air permeability of 1 to 120 cc/cm 2 /sec.

8. The nonwoven fabric according to claim 1 , having an air permeability oft to 100 cc/cm 2 /sec.

9. The nonwoven fabric according to claim 1 , having an air permeability of 1 to 90 cc/cm 2 /sec.

10. The nonwoven fabric according to claim 1 , wherein the melt viscosity of the amorphous polyetherimide at 330° C. is from 200 to 2700 Pa·s.

11. The nonwoven fabric according to claim 1 , wherein the melt viscosity of the amorphous polyetherimide at 330° C. is from 300 to 2500 Pa·s.

12. The nonwoven fabric according to claim 1 , wherein the average fiber diameter is from 1.2 to 9.5 μm.

13. The nonwoven fabric according to claim 1 , wherein the average fiber diameter is from 1.5 to 9 μm.

14. The nonwoven fabric according to claim 1 , having a thickness of 5 to 900 μm.

15. The nonwoven fabric according to claim 1 , having a thickness of 8 to 800 μm.

16. The nonwoven fabric according to claim 1 , having a thickness of 10 to 500 μm.

17. The nonwoven fabric according to claim 1 , having a strength in a vertical direction of 2 N/15 mm to 100 N/15 mm.

Assignees

• Kuraray Co

Inventors

• Sasaki Masahiro
• Shirotani Yasuhiro

Classifications

• D04H1/54 Primary

  by welding together the fibres, e.g. by partially melting or dissolving (in combination with needling D04H1/485) · CPC title

• D04H3/16

  with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion · CPC title

• D04H1/551

  Resins thereof not provided for in groups D04H1/544 - D04H1/55 · CPC title

• D01F6/74

  from polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles · CPC title

• D04H1/56

  in association with fibre formation, e.g. immediately following extrusion of staple fibres · CPC title