Asahi Kasei Kogyo Kabushiki Kaisha

Asahi Kasei Kabushiki Kaisha

Tsumoru Kuwabara

Kenji Takasa

Shinya Hamasaki

Tadashi Inoue

Yuuichi Arito

Kiyotaka Yoshie

A reflecting sheet of the invention includes at least a surface layer portion and an inner layer portion, where the surface layer portion contains at least 0.3 g/mto 20 g/mof an inorganic powder and a polyolefin resin (C), the inner layer portion contains a polyolefin resin (A) and at least one kind of resins (B) incompatible with the polyolefin resin (A) at temperatures enabling stretching of the polyolefin resin(A), the surface layer portion meets (n&#x2212;n)/n&#x2267;0.20 (n: refractive index of the inorganic powder, n: refractive index of the polyolefin resin (C)), and the inner layer portion has voids.

Reflecting sheet

A composite hydrophilic membrane comprising a very thin semipermeable hydrophilic membrane containing a sulfonic group and a polyethylenic microporous membrane containing sulfonic group. This hydrophilic membrane has specially high permeation rate of water and excellent separation ability. The composite hydrophilic membrane is manufactured by a method which comprises fusing a very thin membrane containing an ethylenic copolymer onto the surface of a polyethylenic microporous membrane or a polyethylenic membrane capable of being converted into a microporous membrane thereby forming a composite film, converting the resin film prior to and/or during and/or after sulfonation into a microporous membrane, and causing the composite film to react with a sulfonating agent. This method permits easy and efficient production of the composite hydrophilic membrane.

Composite hydrophilic membrane and method for manufacture thereof

Growing community of inventors

Tokyo, Japan

Tsumoru Kuwabara