Artificial leather base material, method for production thereof, and napped artificial leather

An artificial leather base material comprising:

• a fiber base material consisting of a non-woven fabric that is an entangle body of fibers (A) and fibers (B);
• and
• an elastic polymer applied inside the non-woven fabric,
• wherein the fibers (A) are side-by-side fibers or eccentric sheath-core fibers, formed from two types of resins with intrinsic viscosities different from each other, in which a difference between the intrinsic viscosities of the two types of resins is 0.05 (dl/g) or more, and that are filaments having an average fineness of 0.6 dtex or more,
• the fibers (B) are ultrafine fibers having an average fineness of less than 0.6 dtex, and that are staples having an average fiber length of less than 100 mm, and
• the elastic polymer comprises an aqueous polyurethane, and a content ratio of the aqueous polyurethane is from 8 to 15 mass % in the artificial leather base material.

An artificial leather base material comprising:

• a fiber base material consisting of a non-woven fabric that is an entangle body of fibers (A) and fibers (B);
• and
• an elastic polymer applied inside the non-woven fabric,
• wherein the fibers (A) are side-by-side fibers or eccentric sheath-core fibers, formed from two types of resins with intrinsic viscosities different from each other, in which a difference between the intrinsic viscosities of the two types of resins is 0.05 (dl/g) or more, and that are filaments having an average fineness of 0.6 dtex or more,
• the fibers (B) are ultrafine fibers having an average fineness of less than 0.6 dtex, and that are staples having an average fiber length of less than 100 mm,
• the elastic polymer comprises an aqueous polyurethane, and a content ratio of the aqueous polyurethane is from 8 to 15 mass % in the artificial leather base material, and
• an average void area in a cross section in a thickness direction of the artificial leather base material is 300 to 1000 μm2.