| 摘要 |
PURPOSE:A liquid crystal compsn. having good light stability and giving a display with good contrast, prepd. by incorporating a squarylium compd. of a specified formula. CONSTITUTION:A liquid crystal compsn. prepd. by incorporating a squarylium compd. of the formula I (wherein R<1> is H or 1-13 alkyl; R<2> and R<3> are each H, 1-13C alkyl or 1-13C alkoxy provided that R<2> and R<3> are each positioned at 6, 7 or 8 position) such as a compd. of the formula II or III. The compsn. of the formula is excellent in solubility in a liquid crystal in comparison with a conventional dyestuff and capable of giving a display with good contrast by combination with a liquid crystal. It is possible to use a publicly known smectic or cholesteric liquid crystal as the liquid crystal used in combination with the compd. of the formula I.
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