Base fabrics for polyurethane-coated fabrics, polyurethane-coated fabrics and processes for their production

摘要

A base fabric for polyurethane-coated fabics which comprises a layer of polyurethane prepolymer under half cross-linked conditions partially formed on at least one surface of the water repellent- unfinished fabric. A process for the production of a base fabric for polyurethane-coated fabrics, which comprises partially coating a solution of polyurethane prepolymer containing a cross-linking agent on at least one surface of the water repellent-unfinished fabric, drying and aging until the polyurethane prepolymer is caused to be under half cross-linked conditions. A polyurethane-coated fabric, which comprises a one-pack polyurethane layer with fine air-permeable pores formed on a water repellent-unfinished base fabric having partially formed on at least one surface thereof a layer of a two-pack polyurethane resin, the fabric and one-pack polyurethane layer being adhered to the layer of the two-pack polyurethane resin as a result of a cross-linking reaction of the polyurethane prepolymer. A process for the production of a polyurethane- coated fabric, which comprises coating, on a base fabric which was prepared by partially coating a solution of polyurethane prepolymer containing a cross-linking agent on at least one surface of a water repellent-unfinished fabric, drying and aging in order to modify the polyurethane prepolymer solution to a half cross-linked polyurethane prepolymer layer, a one-pack polyurethane resin solution having incorporated therein powders capable of dissolving in an eluent, but incapable of dissolving in any solvent of the resin solution, drying, aging in order to adhere and integrate the two-pack polyurethane prepolymer layer, the one-pack polyurethane resin layer and the fabric with each other, and dipping in eluent.