US 12,252,824 B2
Nonwoven fabric, method for manufacturing same, and composition for electrospinning
Koichiro Uto, Tsukuba (JP); Mitsuhiro Ebara, Tsukuba (JP); Mitsuru Naiki, Kato (JP); Takafumi Konishi, Osaka (JP); and Hitoshi Yamamoto, Ono (JP)
Assigned to NATIONAL INSTITUTE FOR MATERIALS SCIENCE, Tsubaka (JP); and NIPPON ZOKI PHARMACEUTICAL CO., LTD., Osaka (JP)
Appl. No. 17/257,043
Filed by NATIONAL INSTITUTE FOR MATERIALS SCIENCE, Tsukuba (JP); and NIPPON ZOKI PHARMACEUTICAL CO., LTD., Osaka (JP)
PCT Filed Jul. 9, 2019, PCT No. PCT/JP2019/027201
§ 371(c)(1), (2) Date Dec. 30, 2020,
PCT Pub. No. WO2020/013199, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 2018-129589 (JP), filed on Jul. 9, 2018; and application No. 2019-076599 (JP), filed on Apr. 12, 2019.
Prior Publication US 2021/0140081 A1, May 13, 2021
Int. Cl. D04H 1/728 (2012.01); C08L 67/04 (2006.01); D01D 5/00 (2006.01); D01F 6/62 (2006.01); D04H 1/435 (2012.01); D04H 1/55 (2012.01)
CPC D04H 1/728 (2013.01) [C08L 67/04 (2013.01); D01D 5/0007 (2013.01); D01F 6/62 (2013.01); D01F 6/625 (2013.01); D04H 1/435 (2013.01); D04H 1/55 (2013.01); D10B 2331/04 (2013.01); D10B 2401/12 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A non-woven fabric comprising a fiber including an aliphatic polyester that has at least two maximum values in a number average molecular weight distribution thereof,
wherein the aliphatic polyester has a first maximum value in a region lying between a number average molecular weight of 1500 and a number average molecular weight of 7000,
wherein the aliphatic polyester has a second maximum value in a region lying between a number average molecular weight of 70000 and a number average molecular weight of 150000,
wherein the aliphatic polyester does not include polylactic acid and a copolymer containing a lactic acid unit,
wherein the fiber has an average fiber diameter falling within the range of 100 to 3000 nm, and
wherein the non-woven fabric is biodegradable.