Biphenyl esters of the formula ##STR1## wherein X is --CO--O-- or --O--CO-- and R.sub.1 and R.sub.2 each are alkyl or alkoxy of 1 - 8 carbon atoms, enlarge significantly the temperature range of the nematic phase of liquid-crystalline compositions without adversely affecting other properties.
苯并酯的
化学式为##STR1##,其中X为--CO--O--或--O--CO--,R.sub.1和R.sub.2分别为1-8个碳原子的烷基或烷氧基,显著扩大了液晶组合物向列相的温度范围,而不会对其他性质产生不利影响。