Spun-bonded nonwoven fabric and air filter constituted from spun-bonded nonwoven fabric

Patent metadata

Field	Value
Publication number	US-2021283541-A1
Application number	US-201917261352-A
Country	US
Kind code	A1
Filing date	Jul 22, 2019
Priority date	Jul 27, 2018
Publication date	Sep 16, 2021
Grant date	—

Abstract

The present invention is intended to provide a spunbond nonwoven fabric having low pressure loss, high collecting performance, and excellent processability and an air filter fabricated using the spunbond nonwoven fabric, the spunbond nonwoven fabric including fibers formed of a polyolefin-based resin, in which an average single fiber diameter of the fibers is 6.5 μm or more and 22.0 μm or less, a hindered amine-based compound represented by Formula (1) is contained at 0.1% by mass or more and 5% by mass or less, a melt flow rate (MFR) of the nonwoven fabric is 32 g/10 minutes or more and 850 g/10 minutes or less, and the nonwoven fabric is processed into an electret.

First claim

1 . A spunbond nonwoven fabric comprising fibers formed of a polyolefin-based resin, wherein an average single fiber diameter of the fibers is 6.5 μm or more and 22.0 μm or less, a hindered amine-based compound is contained at 0.1% by mass or more and 5% by mass or less, a melt flow rate (MFR) of the nonwoven fabric is 32 g/10 minutes or more and 850 g/10 minutes or less, and the nonwoven fabric is processed into an electret.

2 . The spunbond nonwoven fabric according to claim 1 , wherein the hindered amine-based compound includes a compound represented by the following Formula (1):

(wherein R 1 to R 3 are hydrogen or an alkyl group having 1 to 2 carbon atoms and R 4 is hydrogen or an alkyl group having 1 to 6 carbon atoms).

3 . A spunbond nonwoven fabric comprising fibers formed of a polyolefin-based resin, wherein an average single fiber diameter of the fibers is 6.5 μm or more and 13.0 μm or less, a compound represented by the following Formula (1) is contained at 0.1% by mass or more and 5% by mass or less, a melt flow rate (MFR) of the nonwoven fabric is 80 g/10 minutes or more and 850 g/10 minutes or less, and the nonwoven fabric is processed into an electret.

(wherein R 1 to R 3 are hydrogen or an alkyl group having 1 to 2 carbon atoms and R 4 is hydrogen or an alkyl group having 1 to 6 carbon atoms).

4 . The spunbond nonwoven fabric according to claim 1 , wherein a basis weight of the nonwoven fabric is 5 g/m 2 or more and 60 g/m 2 or less.

5 . The spunbond nonwoven fabric according to claim 1 , wherein a thickness of the nonwoven fabric is 0.05 mm or more and 1.0 mm or less.

6 . The spunbond nonwoven fabric according to claim 1 , wherein a tensile strength per unit basis weight in a longitudinal direction is 0.3 (N/5 cm)/(g/m 2 ) or more.

7 . The spunbond nonwoven fabric according to claim 1 , wherein a pressure loss per unit basis weight is 0.10 to 0.50 (Pa)/(g/m 2 ) or less.

8 . The spunbond nonwoven fabric according to claim 1 , wherein a crystal nucleating agent is contained in the nonwoven fabric at 0.001% by mass or more and 1.0% by mass or less.

9 . A filter medium for air filter comprising the nonwoven fabric according to claim 1 .

Assignees

• Toray Industries

Inventors

• Yoshida Jun
• Yamano Koji
• Nakano Yohei
• Nishimura Makoto

Classifications

• B01D2239/0627

  Spun-bonded · CPC title

• B01D39/163 Primary

  sintered or bonded · CPC title

• B01D2239/1233

  Fibre diameter · CPC title

• B01D2239/0435

  Electret · CPC title

• D04H3/14

  with bonds between thermoplastic yarns or filaments produced by welding · CPC title