Composite fiber

Patent metadata

Field	Value
Publication number	US-9428851-B2
Application number	US-201214126245-A
Country	US
Kind code	B2
Filing date	Jun 12, 2012
Priority date	Jun 15, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

The fiber cross-section of an island-in-a-sea composite fiber perpendicular to the fiber axis, the island component and sea component are arranged such that the sea component surrounds the island components. The composite cross-section is very consistent, and the fiber has excellent post-processibility. The island-in-a-sea composite fiber wherein diameter of the island component is 10 to 1000 nm, variation of the island component diameter is 1.0 to 20.0%, modification ratio is 1.00 to 1.10, and variation of the modification ratio is 1.0 to 10.0%.

First claim

The invention claimed is:

1. An island-in-a-sea composite fiber having a sea/island ratio of 10/90 to 30/70 in a mass ratio, wherein:
a melt viscosity ratio of an island component polymer to a sea component polymer is 1.7 to 7.5,
number of island components is of from 2,000 to 10,000,
diameter of an island component is 10 to 1000 nm,
variation of island component diameter is 1.0 to 7.0%,
modification ratio is 1.00 to 1.10,
variation of the modification ratio is 1.0 to 10.0%,
variation of a diameter of the sea component surrounded by three adjacent island components in the island-in-sea composite cross section is 1.0 to 20.0%,
ratio of a sea component diameter to an island component diameter is 0.01 to 1.00, and straight lines each connecting centers of two adjacent island components in a set of four adjacent island components are in parallel relation with each other.

2. The fiber according to claim 1 , wherein variation of a distance between 2 adjacent island components is 1.0 to 20.0%.

3. An ultrafine fiber produced by removing the sea component from the island-in-a-sea composite fiber of claim 2 .

4. A textile product wherein the island-in-a-sea composite fiber of claim 2 constitutes at least a part of the product.

5. An ultrafine fiber produced by removing the sea component from the island-in-a-sea composite fiber of claim 1 .

6. A textile product wherein the ultrafine fiber of claim 5 constitutes at least a part of the product.

7. A textile product wherein the island-in-a-sea composite fiber of claim 1 constitutes at least a part of the product.

Assignees

• Masuda Masato
• Funakoshi Joji
• Kishiro Akira
• Toray Industries

Inventors

• Masuda Masato
• Funakoshi Joji
• Kishiro Akira

Classifications

• Y10T428/2931

  Fibers or filaments nonconcentric [e.g., side-by-side or eccentric, etc.] · CPC title

• D01F8/04 Primary

  from synthetic polymers · CPC title

• Y10T428/2929

  Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type] · CPC title

• D01D5/36 Primary

  Matrix structure; Spinnerette packs therefor · CPC title

• Y10T428/249921

  Web or sheet containing structurally defined element or component · CPC title