| abstract |
The invention provides a polar compound which has high chemical stability, high ability to align liquid crystal molecules and high solubility in liquid crystal compositions, and has a high voltage retention rate when used in liquid crystal display elements. A compound represented by formula (1).nn n n n n n n n n n For example, R 1 , R 2 and R 3 are alkyl groups with 1 to 15 carbon atoms; ring A 1 and ring A 3 are cyclohexyl or phenyl, and ring A 2 is 1,4-cyclohexylene or 1,4- Phenylene; Z 1 and Z 2 are single bonds or alkylenes with carbon numbers of 1-10; a is 0, 1, 2, 3 or 4; c, d and e are 0, 1, 2, 3 or 4 ; P 1 ~P 3 are polymerizable groups represented by formula (P-1); n n n M 1 and M 2 are hydrogen or an alkyl group with 1 to 5 carbon atoms; R 4 is a polar group represented by formula (1a) to formula (1c): n n n Sp 5 and Sp 6 are single bonds or alkylene groups with 1 to 10 carbon atoms; S 1 is >CH-, S 2 is >C<; X 1 is -OH. |