公开(公告)号：US20240416292A1

公开(公告)日：2024-12-19

申请号：US18293574

申请日：2022-08-04

Applicant: UNITIKA LTD.

Inventor： Hidehito ANDO ,  Jun TANAKA ,  Ryota NAKAMURA ,  Kyohei UMAKOSHI ,  Keisuke MAEDA ,  Takahiro ONO ,  Tatsunori MASAKI

IPC: B01D71/56 ,  B01D69/08

Abstract: The purpose of the present invention is to provide a polyamide porous membrane that makes it possible to improve liquid permeability while suppressing deterioration of membrane separation performance. A polyamide porous membrane according to the present invention is formed from a polyamide resin, wherein in structural analysis by X-ray diffraction, the ratio of γ crystals with respect to the total amount of a crystals and γ crystals is not less than 38%.

公开(公告)号：US20230347297A1

公开(公告)日：2023-11-02

申请号：US18028866

申请日：2021-09-24

Applicant: UNITIKA LTD. ,  NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY

Inventor： Ryota NAKAMURA ,  Kuniko INOUE ,  Kyohei UMAKOSHI ,  Takahiro ONO ,  Hideto MATSUYAMA

IPC: B01D69/02 ,  B01D71/56 ,  B01D69/08 ,  B01D67/00

CPC classification number: B01D69/02 ,  B01D71/56 ,  B01D69/08 ,  B01D67/0016 ,  B01D67/0027 ,  B01D2325/0231 ,  B01D2325/34

Abstract: An object of the present invention is to provide a polyamide porous membrane having improved fluid permeation performance. A polyamide porous membrane having a dense layer formed on at least one surface, wherein the polyamide porous membrane has a streak-like recessed portion extending in one direction of a surface of the dense layer, and the streak-like recessed portion has an orientation angle of 0 to 5.0° or 175.0 to 180.0° and an orientation intensity of 1.5 to 2.0 according to predetermined orientation analysis.

公开(公告)号：US20230330599A1

公开(公告)日：2023-10-19

申请号：US18028789

申请日：2021-09-24

Applicant: UNITIKA LTD. ,  NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY

Inventor： Ryota NAKAMURA ,  Kuniko INOUE ,  Kyohei UMAKOSHI ,  Takahiro ONO ,  Hideto MATSUYAMA

IPC: B01D61/02 ,  B01D71/56 ,  B01D69/02 ,  B01D69/08 ,  B01D67/00 ,  C07C29/76

CPC classification number: B01D61/027 ,  B01D71/56 ,  B01D69/02 ,  B01D69/081 ,  B01D67/00165 ,  B01D67/0095 ,  B01D67/0086 ,  C07C29/76 ,  B01D2325/34 ,  B01D2325/20 ,  B01D2323/081 ,  B01D2323/60

Abstract: An object of the present invention is to provide a nanofiltration membrane having a molecular weight cut-off of 200 to 1,000 and a high amount pf permeate for methanol, and suitable for use as an organic solvent nanofiltration membrane. A nanofiltration membrane formed using a polyamide resin, the nanofiltration membrane having a molecular weight cut-off of 200 to 1,000 and a methanol permeability of 0.03 L/(m2·bar·h) or more.