Crimped conjugated fiber and non-woven fabric comprising the fiber

Patent metadata

Field	Value
Publication number	US-9611568-B2
Application number	US-201214114816-A
Country	US
Kind code	B2
Filing date	May 10, 2012
Priority date	May 11, 2011
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

It is an object of the present invention to obtain crimped conjugated fibers having excellent crimp properties. The present invention provides a crimped conjugated fiber having a crimpable cross-sectional configuration, wherein a cross section of the fiber includes at least two portions: a portion (a) and a portion (b); the portion (a) includes an olefin polymer (A) and the portion (b) includes an olefin polymer (B); the olefin polymer (A) differs from the olefin polymer (B) in at least any one of Mz/Mw, melting point and MFR; and a specific fatty acid amide is added to the olefin polymer (A) and/or the olefin polymer (B). The present invention also provides a non-woven fabric including said crimped conjugated fiber.

First claim

The invention claimed is:

1. A crimped conjugated fiber having a crimpable cross-sectional configuration, wherein a cross section of the fiber comprises at least two portions: a portion (a) and a portion (b); the mass ratio of the portion (a) to the portion (b) [(a):(b)] is in the range of 10:90 to 60:40; the portion (a) comprises an olefin polymer (A) and the portion (b) comprises an olefin polymer (B); the olefin polymer (A) differs from the olefin polymer (B) in at least any one of Mz/Mw (a ratio of Z-average molecular weight (Mz) to weight average molecular weight (Mw)), melting point and MFR (melt flow rate); and a fatty acid amide having 19 or less carbon atoms is added to the olefin polymer (A) and/or the olefin polymer (B);
wherein the difference between the melting points of the olefin polymer (A) and the olefin polymer (B) is less than 20° C., and the blended amount of the fatty acid amide having 19 or less carbon atoms is in the range of 0.1 to 10 parts by weight based on 100 parts by weight of the olefin polymer (A) and/or the olefin polymer (B).

2. The crimped conjugated fiber according to claim 1 , wherein the crimped conjugated fiber has an eccentric core-sheath configuration in which the portion (a) is a core (a′) and the portion (b) is a sheath (b′).

3. The crimped conjugated fiber according to claim 1 , wherein the olefin polymer (A) and the olefin polymer (B) are a propylene polymer (A1) and a propylene polymer (B1), respectively.

4. The crimped conjugated fiber according to claim 3 , wherein the propylene polymer (A1) and the propylene polymer (B1) are a propylene homopolymer (A2) and a propylene/α-olefin copolymer (B2), respectively.

5. The crimped conjugated fiber according to claim 1 , wherein the fatty acid amide is stearic acid amide, oleic acid amide, or oleylpalmitic acid amide.

6. A non-woven fabric comprising the crimped conjugated fiber according to claim 1 .

7. A non-woven fabric laminate comprising a layer configuration including at least two or more layers, wherein at least one layer of the two or more layers is the non-woven fabric according to claim 6 .

8. An absorbent article comprising the non-woven fabric according to claim 6 , wherein the non-woven fabric is used in a top sheet and/or a second sheet.

9. An absorbent article comprising the non-woven fabric according to claim 6 , wherein the non-woven fabric is used in a sheet in which an absorber is wrapped.

10. The crimped conjugated fiber according to claim 1 , wherein the difference between the melting points of the olefin polymer (A) and the olefin polymer (B) is more than 10° C.

Assignees

• Kawakami Yoshihisa
• Suzuki Kenichi
• Tomita Yoshihiko
• Mitsui Chemicals Inc

Inventors

• Kawakami Yoshihisa
• Suzuki Kenichi
• Tomita Yoshihiko

Classifications

• C08L23/12

  Polypropene · CPC title

• C08L2203/12

  used for fibers · CPC title

• Y10T428/2924

  Composite · CPC title

• D01D5/22

  with a crimped or curled structure; with a special structure to simulate wool (producing crimped or curled effects in filaments or threads after formation D02G1/00) · CPC title

• D01F1/10

  Other agents for modifying properties · CPC title