Cyclosiloxanes containing mesogenic side groups

Details Cyclosiloxanes containing mesogenic side groups Cyclosiloxanes containing mesogenic side groups

C - Chemistry, Metallurgy

07

F

C07F 7/08 (2006.01) C07F 7/21 (2006.01) C09K 19/04 (2006.01) C09K 19/40 (2006.01)

Patent

CA 2046732

The present invention relates to cyclic siloxanes which have at least one group of formula (1) bonded to a silicon atom -(CH2)x-R"-[-L-A-]y-(L)z-T (1), in which x is an integer having a value of at least 2, preferably having a value of from 2 to 10, R" is a chemical bond or a divalent radical of the formula -COO-, -OOC-, -CH=CH-, -C?C- or -Si(R)2-, where the radical R is the same or different, and is optionally a substituted hydrocarbon radical having from 1 to 18 carbon atoms, L which is the same or different represents the 1,4- phenylene or 1,4-cyclohexylene radicals which are optionally 2-, 3-, 5- and/or 6-substituted by at least one radical Q, Q is the same or different radical selected from hydrogen, fluorine or chlorine atoms or cyano, methyl or trifluoromethyl groups, A is the same or different and represents divalent radicals R" or radicals of the formula -CH2-O-, -O-CH2-, -CH2-CH2-, -N=N-, -N=N(O)-, -CH=N- or -N=CH-, y is an integer having a value of from 0 to 10, preferably from 0 to 2, z is an integer having a value of from 0 to 10, preferably from 0 to 2, with the proviso that the sum y+z is at least 1, and T is a cholesteryl radical or a sub- stituted or unsubstituted hydrocarbon radical having from 1 to 18 carbon atoms, in which the substituents are preferably selected from the group consisting of halogen atoms, cyano groups, nitro groups, hydrocarbonoxy groups having from 1 to 10 carbon atoms and mixtures thereof.

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