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：US20220168690A1

公开(公告)日：2022-06-02

申请号：US17614693

申请日：2020-06-01

Applicant: UNITIKA LTD.

Inventor： Jun TANAKA ,  Kuniko INOUE ,  Takahiro ONO

IPC: B01D53/26 ,  B01D69/08 ,  B01D71/48 ,  B01D69/02 ,  B01D71/64 ,  B01D53/22 ,  B01D63/02 ,  D01F6/62 ,  D01F1/02 ,  C08L39/06

Abstract: Provided is a hollow fiber membrane that is excellent in water vapor separation performance immediately after production and water vapor separation performance after repeated use with compressed air. A hollow fiber membrane comprising a polyarylate resin, wherein the hollow fiber membrane includes a skin layer on at least one of inner and outer surfaces, has a tensile strength of 7 MPa or more and an elongation at break of 15% or more, and has an internal pressure water permeability of less than 100 L/(m2·atm/h) as measured using pure water at 25° C.