公开(公告)号：US20230151182A1

公开(公告)日：2023-05-18

申请号：US17906830

申请日：2020-10-23

Applicant: I.S.T CORPORATION

Inventor： Akimasa YOSHIMOTO

IPC: C08K3/04 ,  C08G73/10 ,  C08K7/18 ,  G03G15/20

CPC classification number: C08K3/04 ,  C08G73/1042 ,  C08G73/1071 ,  C08G73/1032 ,  C08K7/18 ,  G03G15/2057 ,  C08K2201/001 ,  C08K2201/005

Abstract: An objective of the present invention is to provide a fixing belt having excellent thermal conductivity and capable of suppressing a torque increase in long-term use. The fixing belt of this invention has a base layer including a polyimide resin, a thermal conductive filler, and a wear-resistant filler, the old Mohs hardness of the wear-resistant filler is 5 or more, the thermal conductivity of the base layer is 0.7 W/mK or more, and the inner surface roughness Rz of the base layer in a sliding direction is 2.0 μm or less.

公开(公告)号：US20250051520A1

公开(公告)日：2025-02-13

申请号：US18723187

申请日：2022-12-21

Applicant: I.S.T Corporation

Inventor： Maki MEZAKI FUJII

IPC: C08G73/10 ,  C08J5/18 ,  C08J9/28

Abstract: A porous polyimide film is obtained from a poly(amic acid) solution containing (a) a poly(amic acid), (b) an organic polar solvent that is a good solvent for the poly(amic acid), and (c) a hydrophobic solvent that is a poor solvent for the poly(amic acid). The poly(amic acid) is obtained by polymerizing an aromatic tetracarboxylic dianhydride containing at least pyromellitic dianhydride and an aromatic diamine containing at least 4,4′-diaminodiphenyl ether. The hydrophobic solvent dissolves in the organic polar solvent, evaporates less readily than the organic polar solvent at the same temperature and pressure, and has a log P in the range of 4.00 or more and 6.00 or less. A method of producing a porous polyimide film includes obtaining a porous polyimide film by drying and then baking a poly(amic acid) solution.

公开(公告)号：US20180076461A1

公开(公告)日：2018-03-15

申请号：US15813734

申请日：2017-11-15

Applicant: I.S.T. CORPORATION ,  NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY

Inventor： Hiroshi YAMADA ,  Kazuki SAWA ,  Yoshihito NIMURA ,  Yuusuke EDA ,  Yasue OKUYAMA ,  Takuhiro MIYUKI ,  Tetsuo SAKAI

IPC: H01M4/62 ,  H01M4/36 ,  C08G73/16 ,  H01M4/139 ,  H01M10/0525

CPC classification number: H01M4/622 ,  C08G73/16 ,  H01M4/139 ,  H01M4/364 ,  H01M10/0525

Abstract: A method for forming an electrode for a lithium ion battery is disclosed. The method includes preparing a mixture slurry, coating the mixture slurry onto a current collector body, and heating the mixture slurry coating to form an active substance layer. The slurry mixture can be prepared by mixing a polyimide precursor solution and active substance particles. The polyimide resin in the active substance layer is porous due to the method.

公开(公告)号：US10125224B2

公开(公告)日：2018-11-13

申请号：US15461957

申请日：2017-03-17

Applicant: I.S.T Corporation

Inventor： Gary L. Deets ,  Jianming Xiong

IPC: C08G73/10 ,  C08J5/24 ,  C08J5/04 ,  C08L79/08

Abstract: A method for using citraconic anhydride and itaconic anhydride as addition cure end caps in reactions for forming polyamic acid oligomers and polyimide oligomers, is provided. Prepregs and high temperature adhesives made from the resulting oligomers, as well as, high temperature, low void volume composites made from the prepregs, are also provided.

公开(公告)号：US20170283990A1

公开(公告)日：2017-10-05

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 ,  C08G73/10 ,  B29C47/00

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.

公开(公告)号：US20170203553A1

公开(公告)日：2017-07-20

申请号：US15324571

申请日：2015-08-07

Applicant: I.S.T CORPORATION

Inventor： Kazuki TSUJIKAWA ,  Masaaki KASHIWA

IPC: B32B27/18 ,  G03G15/20 ,  B32B27/34

CPC classification number: B32B27/18 ,  B32B27/34 ,  C10M107/38 ,  C10M2213/0623 ,  C10N2220/082 ,  C10N2230/06 ,  C10N2250/18 ,  G03G15/2053 ,  G03G2215/2035

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：US20170115075A1

公开(公告)日：2017-04-27

申请号：US15400492

申请日：2017-01-06

Applicant: I.S.T CORPORATION

Inventor： Shunsuke HIRATA ,  Yoji TANI

IPC: F28F13/18 ,  F28F21/06 ,  F28F1/00 ,  C09K5/14 ,  C08G77/38

CPC classification number: F28F13/18 ,  C08G77/12 ,  C08G77/20 ,  C08G77/38 ,  C08L83/06 ,  C08L101/00 ,  C09K5/14 ,  F28F1/00 ,  F28F21/062 ,  G03G15/20 ,  G03G15/2057 ,  G03G2215/2025 ,  G03G2215/2035 ,  C08K5/56 ,  C08L83/00

Abstract: The present invention brings about an increase in the thermal conductivity of an elastomer molded article over a preexisting value. The method according to the present invention is a method that uses at least one of a liquid crystalline polymer and a precursor therefor as a thermal conductivity modifier for an elastomer. That is, the thermal conductivity modifier for an elastomer according to the present invention contains at least one of a liquid crystalline polymer and a precursor therefor. The thermal conductivity modifier may contain only at least one of a liquid crystalline polymer and a precursor therefor or may contain at least one of a liquid crystalline polymer and a precursor therefor along with an additional component. The method and thermal conductivity modifier according to the present invention can bring about an increase in the thermal conductivity of an elastomer molded article over a preexisting value.

公开(公告)号：US20200283625A1

公开(公告)日：2020-09-10

申请号：US16496823

申请日：2018-03-26

Applicant: I.S.T CORPORATION

Inventor： Yuki SHIRAI ,  Koji MORIUCHI

IPC: C08L79/08 ,  C08G73/10 ,  C08J5/18

Abstract: The present invention provides a colorless and transparent polyimide film which exhibits excellent heat resistance, transparency and strength equivalent to those of the conventional colorless and transparent polyimide film, can be produced at a lower cost than the conventional polyimide film, and is more resistant to methyl ethyl ketone than the conventional polyimide film. The colorless and transparent polyimide film of the present invention is made from a specific polyimide resin. The specific polyimide resins comprise a site derived from BPDA, at least one site selected from the group comprising a site derived from BPADA and a site derived from ODPA, a site derived from TFMB, and at least one site selected from the group comprising a site derived from 3,3′-DDS and a site derived from 4,4′-DDS. The haze value of the polyimide film is in the range of 0.1 or more and 2.0 or less.

公开(公告)号：US20200232728A1

公开(公告)日：2020-07-23

申请号：US16842394

申请日：2020-04-07

Applicant: I.S.T CORPORATION

Inventor： Shunsuke HIRATA ,  Yoji TANI

IPC: F28F13/18 ,  C08L101/00 ,  G03G15/20 ,  C08L83/06 ,  C09K5/14 ,  C08G77/38 ,  F28F1/00 ,  F28F21/06

Abstract: The present invention brings about an increase in the thermal conductivity of an elastomer molded article over a preexisting value. The method according to the present invention is a method that uses at least one of a liquid crystalline polymer and a precursor therefor as a thermal conductivity modifier for an elastomer. That is, the thermal conductivity modifier for an elastomer according to the present invention contains at least one of a liquid crystalline polymer and a precursor therefor. The thermal conductivity modifier may contain only at least one of a liquid crystalline polymer and a precursor therefor or may contain at least one of a liquid crystalline polymer and a precursor therefor along with an additional component. The method and thermal conductivity modifier according to the present invention can bring about an increase in the thermal conductivity of an elastomer molded article over a preexisting value.

公开(公告)号：US20180254476A1

公开(公告)日：2018-09-06

申请号：US15552084

申请日：2016-02-17

Applicant: I.S.T Corporation

Inventor： Kae FUJIWARA

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

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.