Sheet material and method for producing same

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.