The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 2020
Filed:
Oct. 12, 2016
Sumitomo Electric Fine Polymer, Inc., Sennan-gun, Osaka, JP;
Fumihiro Hayashi, Osaka, JP;
Yasuhiko Muroya, Osaka, JP;
SUMITOMO ELECTRIC FINE POLYMER, INC., Sennan-gun, Osaka, JP;
Abstract
A semipermeable membrane according to an embodiment of the present invention includes a semipermeable membrane layer containing an amorphous resin as a main component, and a sheet-like supporting body that supports the semipermeable membrane layer. The supporting body has a porous first supporting layer and a porous second supporting layer laminated on one of surfaces of the first supporting layer. The second supporting layer has a smaller mean flow pore diameter than the first supporting layer. The second supporting layer is impregnated with the semipermeable membrane layer. A ratio of the mean flow pore diameter of the second supporting layer to the mean flow pore diameter of the first supporting layer is preferably 1/1,000 or more and ⅕ or less. The mean flow pore diameter of the first supporting layer is preferably 0.05 μm or more and 20 μm or less, and the mean flow pore diameter of the second supporting layer is preferably 0.01 μm or more and 1 μm or less.