BORON NITRIDE-BASED FIBER PAPER AND MANUFACTURING PROCESS THEREOF

• US 20100108276A1
• Filed: 03/04/2008
• Published: 05/06/2010
• Est. Priority Date: 03/05/2007
• Status: Active Grant

• Current Assignee: National Institute for Materials Science
• Original Assignee: Teijin Limited
• Inventors: Golberg, Dmitri, Bando, Yoshio, Tang, Chengchun, Kuwahara, Hiroaki, Zhi, Chunyi
• Granted Patent: US 8,025,766 B2
• Time in Patent Office: Days
• US Class Current: 162/157.100
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: D21H 13/46 Non-siliceous fibres, e.g. from metal oxides
• CPC Class Codes: H05K 1/0306 Inorganic insulating substrates, e.g. ceramic, glass
• CPC Class Codes: H05K 1/0366 reinforced, e.g. by fibres, fabrics H05K1/036 takes precedence
• CPC Class Codes: H05K 1/0386 Paper sheets used as reinforcing materials for organic insulating substrates H05K1/0366
• CPC Class Codes: H05K 2201/026 Nanotubes or nanowires
• CPC Class Codes: H05K 2201/0284 Paper, e.g. as reinforcement

Abstract

A boron nitride fiber paper having a very small fiber diameter and exhibiting excellent heat resistance, mechanical properties and heat conductivity. The fiber paper is composed of a fiber assembly which contains boron nitride fibers having a fiber diameter of not more than 1 μm in an amount of not less than 40 wt %.

Claims

1. A fiber paper comprises a fiber assembly which contains boron nitride fibers having a fiber diameter of not more than 1 μ

m in an amount of not less than 40 wt %.

2. The fiber paper according to claim 1, wherein the average fiber diameter of the fibers constituting the fiber assembly is 0.4 nm to 1 μ

m.

3. The fiber paper according to claim 1, wherein the average aspect ratio of the fibers constituting the fiber assembly is not less than 5.

4. The fiber paper according to claim 1, wherein the boron nitride fibers are boron nitride nanotubes.

5. The fiber paper according to claim 1, wherein the fiber assembly contains the boron nitride nanotubes in an amount of 1 to 100 wt %.

6. A process of manufacturing the fiber paper of claim 1, comprising the steps of:

dispersing a fiber assembly which contains boron nitride fibers having a fiber diameter of not more than 1 μ

m an amount of not less than 40 wt % into a surfactant aqueous solution or an organic solvent; and

making paper from the obtained dispersion.

7. The process according to claim 6, wherein a surfactant aqueous solution or an organic solvent is used as a dispersion solvent.

8. The process according to claim 6, wherein the organic solvent is at least one selected from the group consisting of an alcohol, amine, organic carboxylic acid, organic carboxylate ester, organic acid amide, ketone, ether, sulfoxide, sulfone and sulfolane, each of them having 1 to 10 carbon atoms.

9. The fiber paper according to claim 2, wherein the average aspect ratio of the fibers constituting the fiber assembly is not less than 5.

10. The fiber paper according to claim 2, wherein the fiber assembly contains the boron nitride nanotubes in an amount of 1 to 100 wt %.

11. The fiber paper according to claim 3, wherein the fiber assembly contains the boron nitride nanotubes in an amount of 1 to 100 wt %.

12. The fiber paper according to claim 9, wherein the fiber assembly contains the boron nitride nanotubes in an amount of 1 to 100 wt %.