Patents Assigned to Itsubishi Rayon Co., Ltd.
  • Process for producing porous membranes
    Patent number: 4869857
    Abstract: Porous membranes are produced by dissolving a film-forming polymer in a good solvent for the polymer, forming a film of the resulting polymer solution, and forcibly contacting saturated steam or mist-containing steam with at least one surface of said film. Such porous membranes have pores having a narrow pore diameter distribution and extending in a direction substantially perpendicular to the membrane surface at a high surface pore density on at least one surface thereof.
    Type: Grant
    Filed: May 28, 1987
    Date of Patent: September 26, 1989
    Assignee: Itsubishi Rayon Co., Ltd.
    Inventors: Hajime Itoh, Hiroshi Takahashi, Kouji Ohbori, Hideaki Habara