| 摘要 |
Liquid crystal mixture comprising one or several compounds of formula (I) wherein R<1>: is H or a linear or branched alkyl group of 1 to 20 or a linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case optionally one -CH2- group being replaced by cyclohexylen-1,4-diyl, or one or two -CH2- groups optionally being replaced by -O-, if non-adjacent to N, or by -C(=O)-, -Si(CH3)2-; and/or one or more H of the alkyl or alkenyl group optionally being replaced by F or CH3 R<2>: stands for a) H or F b.) a linear or branched alkyl group of 1 to 20 or linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case one or two -CH2- groups optionally being replaced by -O-, -C(=O)O-, -Si(CH3)2-, and/or one or more fl of the alkyl or alkenyl group being replaced by F or CH3 c) a radical (a) wherein independently from the respective meanings in (1) R<3>, R<4>, R<5>, R<6>: are independently from another an alkyl group of 1 to 8 C atoms M<1>, M<2>: represent independently from another a single bond, -OC(=O), -C(=O)O-, -OCH2-, -NH- A: is a) a linear or branched alkan-alpha,omega)-diyl group of 1 to 20 or alkene-alpha,omega-diyl group of 2 to 20 C atoms, optionally, if non-adjacent to M<1/2>, one or two non-adjacent -CH2- groups may be replaced by -O- b) the group -C(=Y)- wherein Y is CH-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogenatoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M<1 >and M<2 >are -C(=O)O- and -OC(=O)-, c) the group -CHY wherein Y is CH2-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogenatoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M<1 >and M<2 >are -C(=O)O- and -OC(=O)-, d) a group (b) wherein p, q are 0, 1 or 2, the sum of p+q being >=1; M<3 >is a single bond or -OC(=O)-, -C(=O)O-, -OCH2-, -CH2O-, -C=C-, -CH2CH2-, -CH2CH2CH2CH2- the radicals (c) and (d) are independently from another phenylen-1,4-diyl, which optionally can be substituted by one, two or three F, or cyclohexan-1,4diyl, which can optionally be substituted by o
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