Nonwoven fabric, use of same, and method for producing nonwoven fabric

Patent metadata

Field	Value
Publication number	US-12207997-B2
Application number	US-202218019028-A
Country	US
Kind code	B2
Filing date	Jun 30, 2022
Priority date	Jun 30, 2021
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

The present invention provides: a nonwoven fabric which gives a sufficiently soft touch when touched by a human hand, while being suppressed in slipperiness between nonwoven fabrics during the production process of a product such as a sanitary material; and a method for producing a nonwoven fabric. One embodiment of the present invention provides a nonwoven fabric which is formed of fibers containing a thermoplastic resin, wherein: the average single fiber fineness of the fibers is 0.7 dtex to 4.0 dtex; the fibers contain 0.01% by mass to 1.5% by mass of a fatty acid amide relative to the total mass of the fibers; and the coverage of the surfaces of the fibers by the fatty acid amide is from 20% to 90%.

First claim

The invention claimed is:

1. A nonwoven fabric comprised of fibers comprising a thermoplastic resin, wherein an average yarn single fineness of the fibers is 0.7 dtex or more and 4.0 dtex or less, the fibers contain a fatty acid amide in an amount of 0.01% by mass or greater and 1.5% by mass or less with respect to a total fiber mass, and a fatty acid amide coverage on a surface of the fibers is 20% or greater and 90% or less, wherein the thermoplastic resin is a polyolefin and a birefringence Δn of the fibers is 0.015 or greater and 0.029 or less.

2. The nonwoven fabric according to claim 1 , wherein the fibers contain a fatty acid amide in an amount of 0.6% by mass or less with respect to the total fiber mass.

3. The nonwoven fabric according to claim 1 , wherein the fibers contain a fatty acid amide in an amount of 0.1% by mass or greater with respect to the total fiber mass.

4. The nonwoven fabric according to claim 1 , wherein a fatty acid portion of the fatty acid amide has 22 carbon atoms or less.

5. The nonwoven fabric according to claim 1 , wherein the fatty acid amide is erucamide.

6. The nonwoven fabric according to claim 1 , wherein the thermoplastic resin contains 70% by mass or greater and 99% by mass or less of a high-melting-point thermoplastic resin having a melting point above a predetermined melting point and contains 1% by mass or more and 30% by mass or less of a low-melting-point thermoplastic resin having a melting point below or equal to the predetermined melting point, wherein the predetermined melting point is 110° C.

7. The nonwoven fabric according to claim 1 which is a filament nonwoven fabric.

8. An absorbent article comprising the nonwoven fabric according to claim 1 .

9. The absorbent article according to claim 8 which is a disposable diaper, a sanitary napkin, or an incontinence pad.

10. A manufacturing method for the nonwoven fabric according to claim 1 , wherein
the method is a spunbond method comprising a spinning step, a cooling step, a collection step, and a bonding step,
a discharge rate in the spinning step is 4 m/min or more and 8 m/min or less, and
a cold air speed in the cooling step is 0.5 m/s or more and 1.5 m/s or less.

11. The manufacturing method for a nonwoven fabric according to claim 10 , wherein the fatty acid amide is erucamide.

Assignees

• Asahi Chemical Ind
• Mitsui Chemicals Asahi Life Mat Co Ltd

Inventors

• Hirata Daiki
• Shibata Hidesato
• Inokuma Nobuhiro
• Shiota Eiji

Classifications

• A61F2013/51452

  being nonwovens · CPC title

• A61F2013/51173

  with the combination of polymeric films · CPC title

• A61F2013/15959

  by spunbond technique · CPC title

• A61F13/51401 Primary

  characterised by the material · CPC title

• A61F13/5116 Primary

  being formed of multiple layers (A61F13/5123 takes precedence) · CPC title