Polyamide imide fiber, non-woven fabric composed of the fiber, process for manufacture of the non-woven fabric, and separator for electronic component
The present invention provides a fiber having a nano-order fiber diameter, which is produced by without a process of dehydration and cyclization by a heat treatment after fiber spinning and has excellent heat resistance and mechanical strength, and a non-woven fabric composed of the fiber, and discloses the polyamide-imide fiber and the non-woven fabric having an average fiber diameter of from 0.001 μm to 1 μm and also discloses the process for producing threrof. The present invention also provides a separator for an electronic component which has a high conductivity and a small separator thickness and is improved in safety during reflow soldering or short-circuiting, and discloses the separator composed of a non-woven fabric obtained by an electro-spinning method.
1. A non-woven fabric, comprising a polyamide-imide fiber having an average fiber diameter in the range of from 0.001 μm to 1 μm,
wherein the-polyamide-imide fiber comprises a polyamide-imide containing a
moiety or a
moiety,
the polyamide-imide is obtained by using a catalyst selected from the group consisting of triethylamine, diethylenetriamine, 1,8-diazabicyclo[5,4,0]-7-undecene, sodium fluoride, potassium fluoride, cesium fluoride, and sodium methoxide,
and the polyamide-imide has inherent viscosity of 0.86 dL/g or more.
2. The non-woven fabric of claim 1 , wherein the polyamide-imide is of formula (I):
in which Ar 1 is a trivalent residue and Ar 2 is
3. The non-woven fabric of claim 2 , wherein Ar 1 is
4. The non-woven fabric of claim 1 , wherein the polyamide-imide fiber comprises a polyamide-imide containing a
moiety.
5. The non-woven fabric of claim 1 , wherein the polyamide-imide has a glass transition temperature of at least 235° C.
6. A process for producing the non-woven fabric of claim 1 , comprising:
preparing a solution containing the polyamide-imide and an organic solvent, spinning a fiber from the obtained solution by an electro-spinning method, and collecting the fiber containing the polyamide-imide on a collecting substrate.
7. A separator for use in an electronic component, the separator comprising a non-woven fabric produced by the method of claim 6 .
8. The separator of claim 7 , wherein the electronic component is a battery or a capacitor.
9. A separator for use in an electronic component, the separator comprising the non-woven fabric of claim 1 .
10. The separator for use in an electronic component according to claim 9 , wherein air permeability of the separator is in the range of from 1 sec/100 cc Air to 2000 sec/100 cc Air.
11. The separator for use in an electronic component according to claim 9 , wherein the fiber contains the polyamide-imide as a main component.
12. The separator for use in an electronic component according to claim 11 , wherein the polyamide-imide has inherent viscosity of 0.2 dL/g or more.
13. The separator according to claim 12 , wherein the electronic component is a battery or a capacitor.
14. The separator according to claim 11 , wherein the electronic component is a battery or a capacitor.
15. The separator of claim 9 , wherein the electronic component is a battery or a capacitor.
16. The separator of claim 10 , wherein the electronic component is a battery or a capacitor.
17. A non-woven fabric, comprising a polyamide-imide fiber having an average fiber diameter in the range of from 0.001 μm to 1 μm,
wherein the polyamide-imide fiber comprises a polyamide-imide containing a
moity or a
moiety, and the polyamide-imide is obtained from reacting an acid component with an amine component or a diisocyanate component, the amine component comprises 4,4′-diaminodiphenylmethane or o-tolidine, the diisocyanate component comprises 4,4′-diphenylmethanediisocyanate or o-tolidinediisocyanate,
the polyamide-imide is obtained by using a catalyst selected from the group consisting of triethylamine, diethylenetriamine, 1,8-diazabicyclo[5,4,0]-7-undecene, sodium fluoride, potassium fluoride, cesium fluoride, and sodium methoxide,
and the polyamide-imide has inherent viscosity of 0.86 dL/g or more.
18. A process for producing the non-woven fabric of claim 17 , comprising:
preparing a solution containing the polyamide-imide and an organic solvent, spinning a fiber from the obtained solution by an electro-spinning method, and collecting the fiber containing the polyamide-imide on a collecting substrate.
19. A separator for use in an electronic component, the separator comprising the non-woven fabric of claim 17 .
20. The separator of claim 19 , wherein the electronic component is a battery or a capacitor.
21. The non-woven fabric of claim 17 , wherein the polyamide-imide is of formula (I):
in which Ar 1 is a trivalent residue and Ar 2 is
22. The non-woven fabric of claim 21 ,
wherein Ar 1 is
23. The non-woven fabric Of Claim 17 , wherein the polyamide-imide fiber comprises a polyamide-imide containing a
moiety.
24. The non-woven fabric of claim 17 , wherein the polyamide-imide has a glass transition temperature of at least 235° C.
25. A polyamide-imide fiber having an average fiber diameter in the range of from 0.001 μm to 1 μm,
wherein the polyamide-imide fiber comprises a polyamide-imide containing a
moiety,
the polyamide-imide is obtained by using a catalyst selected from the group consisting of triethylamine, diethylenetriamine, 1,8-diazabicyclo[5,4,0]-7-undecene, sodium fluoride, potassium fluoride, cesium fluoride, and sodium methoxide,
and the polyamide-imide has inherent viscosity of 0.86 dL/g or more.
26. The polyamide-imide fiber of claim 25 , wherein the polyamide-imide is of formula (I):
in which Ar 1 is a trivalent residue and Ar 2 is
27. The polyamide-imide fiber of claim 26 , wherein Ar 1 is
28. The polyamide-imide fiber of claim 25 , wherein the polyamide-imide has a glass transition temperature of at least 235° C.
29. The polyamide-imide fiber of claim 25 , wherein the polyamide-imide is obtained from reacting an acid component with an amine component or a diisocyanate component, the amine component comprises o-tolidine, and the diisocyanate component comprises o-tolidinediisocyanate.
30. The polyamide-imide fiber of claim 29 , wherein the polyamide-imide is of formula (I):
in which Ar 1 is a trivalent residue and Ar 2 is
31. The polyamide-imide fiber of claim 30 , wherein Ar 1 is
32. The polyamide-imide fiber of claim 29 , wherein the polyamide-imide has a glass transition temperature of at least 235° C.