| abstract |
An object of the present invention is to provide a retardation element that is excellent in heat resistance, has little change in retardation value under a high temperature atmosphere, and can maintain stable optical performance. This invention contains at least 1 sort (s) of compound chosen from the group which consists of a compound represented by following formula (1), a compound represented by following formula (2), and a compound represented by following formula (3), and a liquid crystalline compound, It is characterized by the above-mentioned. It is a phase difference element made into. Formula (1) of, n is an integer of 3 ~ 10, R 2 is -CH 2 -CH 2 - group, -CH 2 -CH (CH 3) - group or a -CH 2 -CH 2 -CH 2 - Group. Formula (2) of, R 3 is - (CH 2) p - represents a group or a phenylene group, p represents an integer of 4-8. In formula (3), R < 4> represents a substituted phenylene group. In formulas (1) to (3), R 1 -1 , R 1 -2 , and R 1 -3 represent an alkyl group having a branched structure of 5 or more carbon atoms. R 1 -1 , R 1 -2 , and R 1 -3 may be the same or different. [Formula 1] |