Inorganic nanofiber and method for manufacturing same

• US 10,385,188 B2
• Filed: 05/02/2017
• Issued: 08/20/2019
• Est. Priority Date: 03/12/2013
• Status: Active Grant

• Current Assignee: Japan Vilene Company Limited (Toray Industries Incorporated)
• Original Assignee: Japan Vilene Company Limited (Toray Industries Incorporated)
• Inventors: Kosaka, Yusuke, Tarao, Takashi
• Primary Examiner(s): Johnston, Brieann R
• Application Number:
  US15/584,645
• Publication Number:
  US 20170240726A1
• Time in Patent Office: 840 Days
• CPC Class Codes: B32B 18/00 Layered products essentially comprising ceramics, e.g. refractory products
• CPC Class Codes: C04B 2235/44 Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
• CPC Class Codes: C04B 2235/441 Alkoxides, e.g. methoxide, tert-butoxide
• CPC Class Codes: C04B 2235/526 characterised by the length of the fibers
• CPC Class Codes: C04B 2235/5264 characterised by the diameter of the fibers
• CPC Class Codes: C04B 2235/5268 Orientation of the fibers
• CPC Class Codes: C04B 2237/38 Fiber or whisker reinforced
• CPC Class Codes: C04B 35/62231 based on oxide ceramics
• CPC Class Codes: C04B 35/62236 Fibres based on aluminium oxide
• CPC Class Codes: C04B 35/6224 Fibres based on silica
• CPC Class Codes: C04B 35/6225 Fibres based on zirconium oxide, e.g. zirconates such as PZT
• CPC Class Codes: C04B 35/624 Sol-gel processing
• CPC Class Codes: C08K 2003/2227 of aluminium
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 7/08 Oxygen-containing compounds
• CPC Class Codes: D01D 1/02 Preparation of spinning solutions
• CPC Class Codes: D01D 5/0007 Electro-spinning non-woven fabrics produced by electro-spinning D04H1/728
• CPC Class Codes: D01F 9/08 of inorganic material working or processing of metal wire B21F; from softened glass, minerals or slags C03B37/00
• CPC Class Codes: D10B 2101/02 based on oxides or oxide ceramics, e.g. silicates

Abstract

Disclosed are an inorganic nanofiber characterized in that the average fiber diameter is 2 μm or less, the average fiber length is 200 μm or less, and the CV value of the fiber length is 0.7 or less; and a method of manufacturing the same. In the manufacturing method, an inorganic nanofiber sheet consisting of inorganic nanofibers having an average fiber diameter of 2 μm or less is formed by electrospinning, and then, the inorganic nanofiber sheet is pressed using a press machine and crushed so that the average fiber length becomes 200 μm or less, and the CV value of the fiber length becomes 0.7 or less.

Claims

1. A filler-dispersed organic resin composite, wherein an alumina nanofiber is dispersed as an inorganic fibrous filler in an organic resin, said alumina nanofiber having an average fiber diameter of 2 μ

m or less, an average fiber length of less than 100 μ

m, and a CV value of a fiber length of 0.7 or less, wherein a thermal conductivity of the composite is 3 W/m·

K or more at a thickness of 0.3 mm, and a rate of change in fiber length of the alumina nanofiber is 30% or less.

2. The filler-dispersed organic resin composite according to claim 1, wherein a volume percentage of the alumina nanofibers to the whole volume of the composite is 50% or less.