| abstract |
A composition comprising at least three compounds represented by the following general formula (i). (In the formula, R i1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH 2 - groups in the alkyl group are independently -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-, m i1 represents 1 or 2, A i1 represents a 1,4-cyclohexylene group or a hydrogen atom which may be substituted by a fluorine atom or a chlorine atom Phenylene group which may be substituted by fluorine atom or chlorine atom when m i1 is 1, A i1 represents a 1,4-phenylene group in which the hydrogen atom may be substituted by a fluorine atom or a chlorine atom, and m i1 It is 2, and be the same or different when present in plural a i1, i1 X represents a hydrogen atom, a fluorine atom or a chlorine atom) |