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Hachisuka Hisao, Kojima Katsuhide, Nakazono Yutaka, Shimizu Mitsuru, Hirose Masahiko, Kihara Yasuo, Maeda Masatoshi, Ikebata Hisashi, Matsumoto Kenji: Composite reverse osmosis membrane and novel acid chloride.. Nitto Denko, August 25, 1993: EP0556569-A2 (13 worldwide citation)

A composite reverse osmosis membrane comprising a thin membrane and a microporous supporting membrane supporting it, wherein said thin membrane mainly comprises a crosslinked polyamide comprising; (a) an amine component containing at least one member selected from the group consisting of substantial ...


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Hirose Masahiko, Ohara Tomomi, Ando Masaaki: Highly permeable composite reverse osmosis membrane. Nitto Denko, August 6, 1997: EP0787525-A1 (11 worldwide citation)

A module that can be practically used at a pressure of about 3 kgf/cm is obtained by treating a polyamide based reverse osmosis membrane with an oxidizing agent. A composite reverse osmosis membrane comprises a thin film which is a polyamide based skin layer obtained by polycondensation of a compoun ...


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Hirose Masahiko, Ito Hiroki, Ohara Tomomi: Method for producing highly permeable composite reverse osmosis membrane. Nitto Denko, June 26, 1996: EP0718029-A2 (7 worldwide citation)

Disclosed is a method for producing a composite reverse osmosis membrane comprising the steps of coating a porous support with (A) a solution containing a compound having at least two reactive amino groups per molecule and bringing (B) a solution containing a polyfunctional acid halide into contact ...


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Hirose Masahiko: Composite reverse osmosis membrane and method for producing the same. Nitto Denko, September 26, 2001: EP1136116-A1 (6 worldwide citation)

A polyamide skin layer is formed on a porous support by reacting an aromatic compound having at least two reactive amino groups with a polyfunctional acid halide compound having at least two reactive acid halide groups. Then, the polyamide skin layer is treated with a free chlorine aqueous solution ...


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Hirose Masahiko, Ito Hiroki, Ohara Tomomi: Composite reverse osmosis membrane and process for preparing the same. Nitto Denko, July 19, 2000: EP1020218-A1 (6 worldwide citation)

A composite reverse osmosis membrane is described, which includes a polyamide skin layer on a porous support, with a contact angle between the polyamide skin layer surface and water of 45 DEG or less. The composite reverse osmosis membrane has a high salt rejection and also a high water permeability ...


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Hirose Masahiko, Ito Hiroki, Maeda Masatoshi, Tanaka Kazuo: Highly permeable composite reverse osmosis membrane, method of producing the same, and method of using the same. Nitto Denko, June 26, 1996: EP0718030-A2 (4 worldwide citation)

This invention provides a composite reverse osmosis membrane having a polyamide type skin layer whose average surface roughness is at least 55nm, and the polyamide type skin layer comprises the reaction product of a compound having amino groups and polyfunctional acid halide compound having acid hal ...


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Shintani Takuji, Ito Hiroki, Hirose Masahiko, Ando Masaaki: Liquid separation membrane module and method of producing the same. Nitto Denko, December 13, 2000: EP1059114-A2 (4 worldwide citation)

A liquid separation membrane module includes a semipermeable membrane receiving a pressure of a feed liquid and a channel material arranged so as to support the back side of the semipermeable membrane. The channel material is a tricot knitted fabric knitted by a tricot knitting machine with two reed ...


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Ando Masaaki, Hirose Masahiko, Obara Tomoumi: Spiral type separation membrane element and its operation. Nitto Denko, June 6, 2000: JP2000-153270 (4 worldwide citation)

PROBLEM TO BE SOLVED: To provide a spiral type membrane element equipped with an original liquid flow passage material capable of sufficiently suppressing the concentration polarization in the vicinity of a separation membrane, and having high rejection and high permeated liquid quantity, and an ope ...