Invention Grant
- Patent Title: Tetracarboxylic dianhydride, polyimide precursor resin and solution thereof, and polyimide and solution thereof
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Application No.: US16608742Application Date: 2018-04-23
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Publication No.: US11525037B2Publication Date: 2022-12-13
- Inventor: Shinichi Komatsu , Asako Kyobu
- Applicant: ENEOS CORPORATION
- Applicant Address: JP Tokyo
- Assignee: ENEOS CORPORATION
- Current Assignee: ENEOS CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JPJP2017-089810 20170428
- International Application: PCT/JP2018/016434 WO 20180423
- International Announcement: WO2018/199014 WO 20181101
- Main IPC: C08G73/10
- IPC: C08G73/10 ; C08L79/08 ; C07D493/10

Abstract:
A tetracarboxylic dianhydride represented by the following general formula (1): [in the formula (1), R1, R2, and R3 each independently represent a hydrogen atom and the like, and n represents an integer of 0 to 12], wherein a ratio of a summed amount of a specific stereoisomer (A) and a specific stereoisomer (B) is 50% by mole or more relative to a total amount of stereoisomers based on three-dimensional configurations of two norbornane rings in the general formula (1), and a content ratio of the stereoisomer (A) is 30% by mole or more relative to the total amount of the stereoisomers.
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