| abstract |
A leather-like sheet material is manufactured by forming a nonwoven fibrous mat of mixed-spun fibers consisting of at least two polymeric materials, impregnating the mat with a liquid which is a solvent for at least one of the polymeric materials but is a non-solvent for the other polymeric materials and dissolving out at least one of the polymeric materials, and coagulating the resulting polymer solution with another liquid which is a nonsolvent for all of the polymeric materials constituting initially the fibers but is at least partially miscible with the liquid used for the prior impregnation of the mat into a porous polymeric structure. |