POLYAMIDE IMIDE FIBER, NON-WOVEN FABRIC COMPOSED OF THE FIBER, PROCESS FOR MANUFACTURE OF THE NON-WOVEN FABRIC, AND SEPARATOR FOR ELECTRONIC COMPONENT

• US 20100151333A1
• Filed: 07/27/2006
• Published: 06/17/2010
• Est. Priority Date: 07/29/2005
• Status: Active Grant

• Current Assignee: Toyobo MC Corp.
• Original Assignee: Toyobo Company Limited
• Inventors: Shimeno, Katsuya, Sakura, Daisuke, Nakamori, Masahiko, Oda, Syoji, Kobayashi, Hisato, Ohta, Yasuo, Taniguchi, Nobuyuki
• Granted Patent: US 9,023,534 B2
• Time in Patent Office: Days
• US Class Current: 429/249
• CPC Class Codes: B01D 2323/39 Electrospinning
• CPC Class Codes: B01D 71/64 Polyimides; Polyamide-imides; Polyester-imides; Polyamide acids or similar polyimide precursors
• CPC Class Codes: B01D 71/641 Polyamide-imides
• CPC Class Codes: D01D 5/0038 the fibre formed by solvent evaporation, i.e. dry electro-spinning
• CPC Class Codes: D01F 6/78 from copolycondensation products
• CPC Class Codes: D04H 1/42 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
• CPC Class Codes: D04H 1/4342 Aromatic polyamides
• CPC Class Codes: D04H 1/43838 Ultrafine fibres, e.g. microfibres
• CPC Class Codes: D04H 3/02 characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01G 9/02 Diaphragms; Separators
• CPC Class Codes: H01M 50/44 Fibrous material
• CPC Class Codes: H01M 8/0687 Reactant purification by the use of membranes or filters
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 428/298 Physical dimension
• CPC Class Codes: Y10T 442/60 Nonwoven fabric [i.e., nonwoven strand or fiber material]
• CPC Class Codes: Y10T 442/608 Including strand or fiber material which is of specific structural definition
• CPC Class Codes: Y10T 442/697 : Containing at least two chemically different strand or fiber materials

Abstract

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.

Claims

1. A polyamide-imide fiber having an average fiber diameter in the range of from 0.001 μ

m to 1 μ

m.

2. The polyamide-imide fiber according to claim 1, wherein the polyamideimide fiber consists of polyamide-imide having inherent viscosity of 0.2 dl/g or more.

3. The polyamide-imide fiber according to claim 1 or 2, wherein polyamide-imide has at least a structure represented by a formula (I):

wherein Ar₁ represents a trivalent residue other than three carboxy groups of a tricarboxylic acid and Ar_e represents a divalent residue other than two amino groups of a diamine compound.

4. A non-woven fabric composed of the polyamide-imide fiber according to any one of claims 1 to 3claim 1.

5. A process for producing the non-woven fabric of claim 4, comprising:

preparing a solution containing polyamide-imide and an organic solvent, spinning a fiber from the obtained solution by an electro-spinning method, and collecting the polyamide-imide fiber on a collecting substrate.

6. A separator for use in an electronic component, comprising a non-woven fabric obtained by an electro-spinning method.

7. The separator for use in an electronic component according to claim 6, comprising a non-woven fabric composed of a fiber having an average fiber diameter in the range of from 0.001 μ

m to 1 μ

m.

8. The separator for use in an electronic component according to claim 6, wherein air permeability is in the range of from 1 sec/100 cc Air to 2000 sec/100 cc Air.

9. The separator for use in an electronic component according to claim 6, wherein the fiber composing the non-woven fabric contains polyamide-imide as a main component.

10. The separator for use in an electronic component according to claim 9, wherein the separator consists of polyamide-imide having inherent viscosity of 0.2 dl/g or more.

11. The separator for use in an electronic component according to claim 9, wherein the polyamide-imide has at least a structure represented by a formula (I).

12. The separator according to claim 9, wherein the electronic component is a battery or a capacitor.

13. The separator according to claim 10, 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.