	US 11,885,044 B2
	Method for producing polypropylene nonwoven fabric
Kyung Seop Noh, Daejeon (KR); Seong Min Chae, Daejeon (KR); Churl Young Park, Daejeon (KR); Sangjin Jeon, Daejeon (KR); and Taejin Kim, Daejeon (KR)
Assigned to LG Chem, Ltd.
Appl. No. 16/643,651
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Dec. 17, 2018, PCT No. PCT/KR2018/016030 § 371(c)(1), (2) Date Mar. 2, 2020, PCT Pub. No. WO2019/124911, PCT Pub. Date Jun. 27, 2019.
Claims priority of application No. 10-2017-0177535 (KR), filed on Dec. 21, 2017; and application No. 10-2018-0161300 (KR), filed on Dec. 13, 2018.
Prior Publication US 2020/0240058 A1, Jul. 30, 2020
Int. Cl. D01F 6/06 (2006.01); D04H 1/4291 (2012.01); C08F 110/06 (2006.01); D04H 1/44 (2006.01); D01D 1/02 (2006.01); D01D 5/088 (2006.01); C08F 4/02 (2006.01)

CPC D01F 6/06 (2013.01) [C08F 4/02 (2013.01); C08F 110/06 (2013.01); D01D 1/02 (2013.01); D01D 5/088 (2013.01); D04H 1/4291 (2013.01); D04H 1/44 (2013.01); C08F 2420/01 (2013.01); D10B 2321/022 (2013.01)]

15 Claims

1. A method for producing a polypropylene nonwoven fabric comprising the steps of:

step 1: spinning a metallocene polypropylene resin to produce filaments;

step 2: cooling the spun filaments at a temperature of 10 to 20° C.; and

step 3: bonding the cooled filaments together at 150 to 165° C. to form a nonwoven fabric,

wherein the metallocene polypropylene resin has:

a weight average molecular weight of 100,000 to 150,000,

a molecular weight distribution (PDI) of 2.0 to 2.5,

a melt index (MI) of 20 to 28 g/10 min measured at 230° C. under a load of 2.16 kg according to ASTM D1238,

a melting point of 150 to 155° C., and

a xylene soluble (XS) content of 2% by weight or less.