Nanofiber structure and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2017130366-A1
Application number	US-201615342954-A
Country	US
Kind code	A1
Filing date	Nov 3, 2016
Priority date	Nov 6, 2015
Publication date	May 11, 2017
Grant date	—

Abstract

In a nanofiber structure in which a nanofiber A and a nanofiber B are tangled with each other, the softening point of the nanofiber A is different from that of the nanofiber B, a cross-section along a surface of the nanofiber A orthogonal to a longitudinal direction thereof has a shape having a concave portion, and the nanofiber A and the nanofiber B are fused with each other at this concave portion.

First claim

What is claimed is:

1 . A nanofiber structure comprising:
a nanofiber A; and a nanofiber B tangled with the nanofiber A, wherein: the softening point of the nanofiber A is different from the softening point of the nanofiber B, a cross-section along a surface of the nanofiber A orthogonal to a longitudinal direction thereof has a shape having a concave portion, and at the concave portion, the nanofiber A and the nanofiber B are fused with each other.

2 . The nanofiber structure according to claim 1 , wherein the concave portion is provided in an edge portion of the cross-section in a direction orthogonal to a longitudinal direction thereof.

3 . The nanofiber structure according to claim 1 , wherein the concave portion is provided in an edge portion of the cross-section in a longitudinal direction thereof.

4 . The nanofiber structure according to claim 1 , wherein:
the average width of the cross-section of the nanofiber A is from 1 nm to 8×10 4 nm, the cross-section of the nanofiber A at which the width thereof is from 1 nm to 8×10 4 nm has a shape having at least two convex portions, the height of the convex portion is equal to or more than the average height of the cross-section of the nanofiber A and is equal to or less than the maximum height of the cross-section of the nanofiber A, and the average fiber diameter of the nanofiber B is from 1 nm to 3,000 nm.

5 . The nanofiber structure according to claim 1 , wherein a ratio L/Y of an average value L of the width of the cross-section of the nanofiber A to an average value Y of the fiber diameter of the nanofiber B is from 3.3×10 −4 to 8×10 3 .

6 . The nanofiber structure according to claim 1 , wherein constituent materials of the nanofiber A and the nanofiber B are each a thermoplastic resin, and
the difference in softening point between the constituent material of the nanofiber A and the constituent material of the nanofiber B is from more than 0° C. to less than 100° C.

7 . The nanofiber structure according to claim 1 , wherein the difference in average solubility parameter between a constituent material of the nanofiber A and a constituent material of the nanofiber B is from 0 to 25 (J/cm 3 ) 1/2 .

8 . The nanofiber structure according to claim 1 , wherein an average presence rate of nanofibers on the surface of the nanofiber structure is from 10% to 60%.

9 . The nanofiber structure according to claim 1 , wherein:
the nanofiber structure is a sheet-shaped structure, and the thickness of the sheet-shaped structure is from 1 μm to 1 mm.

10 . A method for manufacturing a nanofiber structure, wherein the nanofiber structure comprises:
a nanofiber A; and a nanofiber B tangled with the nanofiber A, wherein: the softening point of the nanofiber A is different from the softening point of the nanofiber B, a cross-section along a surface of the nanofiber A orthogonal to a longitudinal direction thereof has a shape having a concave portion, and at the concave portion, the nanofiber A and the nanofiber B are fused with each other, the method comprising: forming a precursor by tangling at least the nanofiber A and the nanofiber B; and heating the precursor.

11 . The method according to claim 10 , wherein the nanofiber A or the nanofiber B contains an organic resin material and a low molecular weight organic compound having a chemical reactivity.

12 . The method according to claim 10 , wherein in the heating, the precursor is heated without pressure application.

Assignees

• Canon Kk

Inventors

• Yasufuku Kaori
• Hino Tetsuo
• Takashima Kenji
• Yamauchi Kazuhiro

Classifications

• D01F6/36

  comprising unsaturated carboxylic acids or unsaturated organic esters as the major constituent · CPC title

• D01F6/12 Primary

  from polymers of fluorinated hydrocarbons · CPC title

• D01F6/28

  from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• D01D10/02

  Heat treatment (heating for finishing D02J13/00) · CPC title

• D01F6/30

  comprising olefins as the major constituent · CPC title