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Title:
LIQUID CRYSTAL ALIGNMENT AGENT, PRODUCTION METHOD THEREOF, LIQUID CRYSTAL ALIGNMENT FILM, AND LIQUID CRYSTAL DISPLAY ELEMENT
Document Type and Number:
WIPO Patent Application WO/2020/040089
Kind Code:
A1
Abstract:
A liquid crystal alignment agent is provided which, even when reducing the light irradiation amount in alignment treatment by the photo-alignment method, enables obtaining excellent afterimage characteristics in an IPS-driven or FFS-driven liquid crystal display element; a production method of the liquid crystal alignment agent, a liquid crystal alignment film obtained therefrom, and a liquid crystal display element provided therewith are also provided. This liquid crystal alignment agent is characterized by containing a polyimide, which is the imidized product of a polyimide precursor obtained from a polycondensation reaction of: a tetracarboxylic acid component that contains tetracarboxylic dianhydride represented by formula (1), or a derivative thereof; and a diamine component that contains a first diamine represented by formula (3) and a second diamine represented by formula (4). (X1 is a structure represented by formula (X1-1) or (X1-2). R3-R12 are independently a hydrogen atom, a halogen atom, an alkyl group of 1-6 carbons, etc., and at least one of R3-R6 is not a hydrogen atom.) (A1 is an alkylene of 2-10 carbons, etc., a is an integer 0-4, A2 is a halogen atom, etc., and if there are multiple A2's, than the structure of the A2's may be the same or different. b and c are 1 or 2, and d is 0 or 1.)

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Inventors:
NAGI TATSUYA (JP)
SUGIYAMA TAKAAKI (JP)
FUKUDA IPPEI (JP)
HASHIMOTO JUN (KR)
ISHIKAWA KAZUNORI (KR)
Application Number:
PCT/JP2019/032286
Publication Date:
February 27, 2020
Filing Date:
August 19, 2019
Export Citation:
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Assignee:
NISSAN CHEMICAL CORP (JP)
International Classes:
C08G73/14; G02F1/1337
Domestic Patent References:
WO2019082975A12019-05-02
Foreign References:
CN107698761A2018-02-16
JP2016006473A2016-01-14
Attorney, Agent or Firm:
T.S. PARTNERS et al. (JP)
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