Title:
PRODUCTION OF PURIFIED LIQUID CRYSTAL, AND LIQUID CRYSTAL CELL AND LIQUID CRYSTAL DISPLAY
Document Type and Number:
Japanese Patent JP3393614
Kind Code:
B2
Abstract:
PURPOSE: To produce a purified liq. crystal which gives a liq. crystal cell having improved voltage retention, long-term display stability, etc., by treating a liq. crystal with a powder of an imide compd.
CONSTITUTION: A liq. crystal (e.g. a Schiff base, azo, or biphenyl liq. crystal) is purified by treating it with a powder of an imide compd. [e.g. a powder of a polyimide of formula I (wherein A3 is a group of formula II or III; Z is -CH2-, -O-, -SO2-, -S-, etc.; and A4 is a group of formula IV or V, etc.) obtd. by reacting a tetracarboxylic dianhydride with a diamine or diisocyanate]. Thus, the liq. crystal is sufficiently purified by using only a small amt. of the powder, giving a purified liq. crystal which has a greatly improved resistivity and gives a liq. crystal cell having a greatly improved voltage retention.
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Inventors:
Osamu Hirai
Ryoji Tashiro
Osamu Watanabe
Hiroshi Nishizawa
Kenji Suzuki
Ryoji Tashiro
Osamu Watanabe
Hiroshi Nishizawa
Kenji Suzuki
Application Number:
JP30638193A
Publication Date:
April 07, 2003
Filing Date:
December 07, 1993
Export Citation:
Assignee:
Hitachi Chemical Co., Ltd.
International Classes:
C09K19/00; G02F1/13; (IPC1-7): C09K19/00; G02F1/13
Domestic Patent References:
| JP4258925A | ||||
| JP1242622A | ||||
| JP60221425A |
Attorney, Agent or Firm:
Tetsuo Hodaka
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