Stretchable leather-like sheet substrate and process for producing same

A leather-like sheet substrate comprising a fiber-entangled nonwoven fabric that comprises a microfine fiber bundle (A) and a microfine fiber bundle (B) in a blending ratio (A)/(B) of 30/70 to 70/30 by mass and a polymeric elastomer contained in the fiber-entangled nonwoven fabric, the microfine fiber bundle (A) comprising 10 to 100 microfine fibers each of which has a single fiber fineness of 0.5 dtex or less and which are made of an elastic polymer having a JIS A hardness of 90 to 97, and the microfine fiber bundle (B) comprising a microfine fiber which has a single fiber fineness of 0.5 dtex or less and which is made of a non-elastic polymer,

• wherein microfine fiber bundle (A) does not contain microfine fibers made of non-elastic polymers and that microfine fiber bundle (B) does not contain microfine fibers which have a single fiber fineness of 0.5 dtex or less and which are made of an elastic polymer having a JIS A hardness of 90 to 97, and
• wherein the microfine fibers in the microfine fiber bundle (A) inside the leather-like sheet substrate partially stick to each other, such that the elastic microfine fibers in the microfine fiber bundle (A) laterally stick together while keeping their original fibrous shape, and that the sticking length is ⅔ or less of the fiber diameter when measured on a cross section perpendicular to the lengthwise direction of fibers.