公开(公告)号：US20240239741A1

公开(公告)日：2024-07-18

申请号：US18558803

申请日：2022-03-25

Applicant: SEIKA CORPORATION

Inventor： Mitsutaka Imoto ,  Yasuyuki Miyata ,  Motonori Takeda ,  Kazuhide Nishiyama ,  Hitoshi Yamato

IPC: C07C317/22 ,  C07C229/60 ,  C08G73/10

CPC classification number: C07C317/22 ,  C07C229/60 ,  C08G73/10 ,  C08G73/1007

Abstract: [Problems] The purposes of the present invention are to provide a novel meta-type ester-containing aromatic diamines, a method for preparing the same, and a polyimide synthesis.
[Solution] The present invention provides a compound represented by the following formula (1) and a method for preparing the same:




In the formula (1), X is selected from the following structures (a), (b) and (c),




wherein R1, R2, R3, and R4 in the formula (1) and R5, R6, R7, R8, R9 and R10 in (a), (b) and (c) are, independently of each other, a hydrogen atom, an optionally substituted alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 3 carbon atoms, provided that at least one of R7, R8, R9 and R10 is the alkyl group or the alkoxy group.

公开(公告)号：US20240383844A1

公开(公告)日：2024-11-21

申请号：US18679681

申请日：2024-05-31

Applicant: SEIKA CORPORATION

Inventor： Mitsutaka Imoto ,  Yasuyuki Miyata ,  Motonori Takeda ,  Kazuhide Nishiyama ,  Hitoshi Yamato

IPC: C07C317/22 ,  C07C229/60 ,  C08G73/10

Abstract: [Problems] The purposes of the present invention are to provide a novel meta-type ester-containing aromatic diamines, a method for preparing the same, and a polyimide synthesis.
[Solution] The present invention provides a compound represented by the following formula (1) and a method for preparing the same: In the formula (1), X is selected from the following structures (a), (b) and (c), wherein R1, R2, R3, and R4 in the formula (1) and R5, R6, R7, R8, R9 and R10 in (a), (b) and (c) are, independently of each other, a hydrogen atom, an optionally substituted alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 3 carbon atoms, provided that at least one of R7, R8, R9 and R10 is the alkyl group or the alkoxy group.

公开(公告)号：US20220402858A1

公开(公告)日：2022-12-22

申请号：US17783848

申请日：2020-12-02

Applicant: SEIKA CORPORATION

Inventor： Takahiko Tatsumi ,  Motonori Takeda ,  Kazuhide Nishiyama ,  Shinichi Kitahara

IPC: C07C209/54 ,  B01J27/02

Abstract: The object of the present invention is to provide a method which provides a diaminobiphenyl compound in a high yield and in a short period of time by a benzidine rearrangement reaction of a hydrazobenzene having a bulky substituent group at the meta position. Specifically, the present invention provides a method for preparing a diaminobiphenyl compound represented by the following formula (1): wherein, X1 and X2 are, independently of each other, a group selected from the group consisting of a trifluoromethyl group and, optionally fluorinated, isopropyl, isobutyl, sec-butyl, tert-butyl and neopentyl groups, comprising a step of subjecting a diphenylhydrazine compound represented by the following formula (2) wherein X1 and X2 are as defined above, to a benzidine rearrangement reaction in the presence of an organic solvent and an inorganic acid at a temperature of from −70° C. to −11° C. to obtain the diaminobiphenyl compound represented by the formula (1).