公开(公告)号：US10906277B2

公开(公告)日：2021-02-02

申请号：US15324571

申请日：2015-08-07

Applicant: I.S.T CORPORATION

Inventor： Kazuki Tsujikawa ,  Masaaki Kashiwa

IPC: G03G15/20 ,  B32B27/18 ,  B32B27/28

Abstract: A problem addressed by the present invention is to provide a low-friction member which does not easily lose low-friction properties thereof even when used for a relatively long period. The low-friction member LS according to the present invention is consisting of at least lubricating materials PL, PS and a polyimide resin MR. The low-friction member has a surface roughness Rsk or 0.500 or more and the surface exposure ratio of the lubricating materials of 15.0% or more. It is particularly preferred that the surface roughness Rsk be in a range of 0.0900 (inclusive) to 0.1400 (inclusive), and the surface exposure ratio of the lubricating materials be 35.0% or more. It is preferred that the lubricating materials be a fluororesin. The low-friction member thus has the property of not losing the low-friction properties thereof easily even when used for a relatively long period.

公开(公告)号：US10686187B2

公开(公告)日：2020-06-16

申请号：US15552084

申请日：2016-02-17

Applicant: I.S.T Corporation

Inventor： Kae Fujiwara

IPC: H01M4/36 ,  H01M4/62 ,  H01M4/13 ,  C08G73/10 ,  H01M4/587 ,  H01M4/38 ,  H01M4/48 ,  H01M10/0525 ,  H01M10/0569 ,  H01M4/02

Abstract: A polyimide-coated active material particle (21) of the present invention includes an active material particle (23) and a polyimide layer (24) derived from a monomeric polyimide precursor and coated on the active material particle (23). A negative electrode (200) of the present invention includes a current collector (30) and an active material layer (20) including the negative electrode active material particle (21) coated with the polyimide layer (24) derived from a monomeric polyimide precursor, and an aqueous binder (22). With the polyimide-coated active material particle of the present invention, it is possible to suppress the amount of organic solvent used and improve the charge-discharge cycle of the electrode.

公开(公告)号：US10662555B2

公开(公告)日：2020-05-26

申请号：US15425249

申请日：2017-02-06

Applicant: I.S.T Corporation

Inventor： Ryuta Nakagaki ,  Katsuki Morishima ,  Koji Moriuchi

IPC: D01F6/74 ,  B29C48/05 ,  B29C48/00 ,  D01D5/06 ,  D01F1/10 ,  C08G73/10 ,  D01F6/88 ,  B29K79/00

Abstract: The method for producing a polyimide fiber includes a coagulation step of forming a polyimide precursor fiber by extruding a polyimide precursor solution containing a polyimide precursor and a compound having an acid dissociation constant (pKa) of a conjugate acid in water at 25° C. of 6.0 to 10 inclusive and an octanol-water partition coefficient (Log P) at 25° C. of −0.75 to 0.75 inclusive into a poor solvent or nonsolvent for the polyimide precursor; and a heat drawing step of forming the polyimide fiber by drawing the polyimide precursor fiber while heating same. The polyimide fiber of the present disclosure has a physical property such that the coefficient of thermal expansion thereof is in the range of −15 ppm/K to 0 ppm/K inclusive.