Patent ID: 7071130

Claim:
A membrane casted material made of a segregating membrane and a segregating membrane supporting material in which the segregating membrane is casted on the segregating membrane supporting material, the membrane casted material comprising: a segregating membrane including at least one member selected from the group consisting of polysulfone-based, polyvinylidene fluoride-based, polyamide-based, polyimide-based, and polyacrylonitrile-based high polymer materials, and a segregating membrane supporting material in which fibers are assembled in three-dimensions to form non-woven fabric, the non-woven fabric is processed by thermo-compression to join together fibers, which make up the non-woven fabric in sheet form, making the segregating membrane supporting material, and the non-woven fabric includes at least 10 weight % polyacrylonitrile-based synthetic fibers having a fiber length of 1 mm–25mm and is processed by thermo-compression making a segregating membrane supporting material with overall bulk density 40% to 75% of the density of the fibers which make up the non-woven fabric, and wherein the segregating membrane is dissolved in a solvent during casting which also dissolves the support material to bind the segregating membrane and segregating membrane supporting material.