US 12,338,575 B2
Sheet material and method for producing same
Koki Ishii, Osaka (JP); Ryuji Shikuri, Gifu (JP); and Takuya Shibano, Otsu (JP)
Assigned to Toray Industries, Inc., Tokyo (JP)
Appl. No. 17/784,749
Filed by Toray Industries, Inc., Tokyo (JP)
PCT Filed Dec. 10, 2020, PCT No. PCT/JP2020/046006
§ 371(c)(1), (2) Date Jun. 13, 2022,
PCT Pub. No. WO2021/125029, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 2019-230228 (JP), filed on Dec. 20, 2019; application No. 2020-049011 (JP), filed on Mar. 19, 2020; and application No. 2020-091118 (JP), filed on May 26, 2020.
Prior Publication US 2023/0009350 A1, Jan. 12, 2023
Int. Cl. D06N 3/00 (2006.01); D06N 3/12 (2006.01)
CPC D06N 3/0004 (2013.01) [D06N 3/0011 (2013.01); D06N 3/0063 (2013.01); D06N 3/121 (2013.01); D06N 2201/02 (2013.01); D06N 2209/128 (2013.01); D06N 2209/1635 (2013.01); D06N 2209/1685 (2013.01); D06N 2211/06 (2013.01); D06N 2211/10 (2013.01); D06N 2211/14 (2013.01); D06N 2211/263 (2013.01); D06N 2211/265 (2013.01); D06N 2211/267 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A sheet material comprising:
a fibrous base material made of ultrafine fibers;
a chain extender, and
an elastomer,
wherein an average single-fiber diameter of the ultrafine fibers is 0.1 μm or more and 10.0 μm or less,
wherein the chain extender comprises water, a low-molecular weight diol, an alicyclic diol, an aromatic diol, an aliphatic diamine, an alicyclic diamine, an aromatic diamine, an aroaliphatic diamine, an alkanolamine, hydrazine, a dihydrazide, or a mixture thereof;
the elastomer has a hydrophilic group and an N-acylurea bond and/or an isourea bond, and
the following condition 1 and condition 2 are satisfied:
condition 1: A longitudinal stiffness, in accordance with method A (45° cantilever method) in the text of “8.21 Stiffness” of JIS L 1096:2010 “Testing Methods for Woven and Knitted Fabrics”, is 40 mm or more and 140 mm or less; and
condition 2: After immersion for 24 hours in N,N-dimethylformamide, the following are obtained in wear testing using a pressing load of 12.0 kPa and 20,000 friction cycles in accordance with method E (Martindale method) in the text of “8.19 Wear Strength and Friction Discoloration” of JIS L 1096:2010 “Testing Methods for Woven and Knitted Fabrics”: a grade of at least 4 and a wear loss of not more than 25 mg.