Liquid crystal compositions are described which comprise a mixture of compounds and which includes at least one additive compound characterized in that the composition includes one or more additive compounds of Formula I as follows: ##STR1## wherein R.sub.1 represents an alkyl group, R.sub.2 represents an alkyl or alkoxy group or hydrogen and ##STR2## represents a 1,4-disubstituted bicyclo(2,2,2)octane ring. The preparation and properties of novel compounds of Formula I are also described. These liquid crystal compositions are useful in display devices such as digital calculators and word displays.
本文描述了一种液晶组合物,其中包含至少一种添加剂化合物,其特征在于组合物包含以下公式I中的一种或多种添加剂化合物:##STR1## 其中R.sub.1代表烷基基团,R.sub.2代表烷基或烷氧基或氢,而##STR2##则代表1,4-二取代的双环[2,2,2]
辛烷环。本文还描述了公式I的新化合物的制备和性质。这些液晶组合物在数字计算器和词语显示等显示设备中非常有用。