Base material for artificial leather and grained artificial leather

摘要

A method of producing a substrate suitable for artificial leathers. The substrate is composed of an entangled nonwoven fabric made of microfine fibers and a binder resin. At least one surface of the substrate is a densified layer which is made of the microfine fibers and which is substantially free from the binder resin. The binder resin is impregnated into a portion of the substrate other than the densified layer. The densified layer prevents the binder resin impregnated into the entangled nonwoven fabric from migrating into the surface of the entangled nonwoven fabric, thereby providing the substrate having the surface substantially free from the binder resin. The peeling strength between the substrate and a grain layer formed on the surface thereof is drastically improved because the surface of the substrate is substantially free from the binder resin.

主权项

1. A method of producing a substrate, the method comprising:
(1) producing an entangled nonwoven fabric comprising microfine fiber-forming fibers comprising a water-soluble, thermoplastic polyvinyl alcohol-based resin as a removable component; (2) adding water to at least one surface of the entangled nonwoven fabric and hot-pressing the surface added with water, to obtain a nonwoven fabric comprising (i) a densified layer and (ii) a portion other than the densified layer; (3) impregnating an aqueous emulsion of a binder resin into the portion other than the densified layer and coagulating the impregnated binder resin; and (4) converting the microfine fiber-forming fibers into bundles of microfine fibers by extracting the water-soluble, thermoplastic polyvinyl alcohol-based resin, to obtain a substrate that is suitable for an artificial leather.