Patent ID: 6010643
Filing Date: 2000-01-04
Classification: C07C,C09K

Abstract:
A liquid crystalline material in the form of a cholesteric polymer network having polymerized terpenoid units therein, wherein the material is obtained by copolymerization of a compound (a) having at least two polymerizable functional groups and a chiral polymerizable terpenoid-containing compound (b) of the formula IR.sup.1 -(P).sub.u -X-(MG.sup.1 -COO).sub.s -T IwhereinT is a terpenoid radical,R.sup.1 CH.sub.2 .dbd.CW--COO--, ##STR21## HWN--, CH.sub.2 .dbd.CH--, CH.sub.2 .dbd.CH--O-- or HS--CH.sub.2 --(CH.sub.2).sub.m --COO-- with W being H, Cl or alkyl with 1-5 C atoms and m being 1-7,P is alkylene with 1 to 12 C atoms, one or more non-adjacent CH.sub.2 groups optionally being replaced by --O--,X is --O--, --S--, --COO--, --OCO-- or a single bond,MG.sup.1 is an aromatic ring system or a mesogenic group, selected from groups of the following formulae: ##STR22## with L being CH.sub.3, --COCH.sub.3, --CN, F or Cl and r being 0, 1 or 2, -Phe'-Z-Phe--Phe'-Z-Pyd--Phe'-Z-Pyr--Nap'-Z-Phe'--Nap-Z-Pyd--Nap-Z-Pyr--Phe'-Z-Phe""-Phe""--Phe'-Z-Pyd-Phe""--Phe'-Z-Pyr-Phe""--Phe'-Z-Phe""-Pyd--Phe'-Z-Phe""-Pyr--Nap'-Z-Phe""-Phe""--Nap'-Z-Phe'-Pyr-wherein Phe is 1,4-phenylene, which is unsubstituted or mono- to poly-subsituted by CN or halogen, Nap is a naphthaline-2,6-diyl which is unsubstituted or substituted 1-4 times by halogen, Pyd denotes pyrimidine-2,5-diyl, Pyr denotes pyridine-2,5-diyl, and Z denotes --CO--O--, --O--CO--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --C.tbd.C-- or a single bonds is 0 or 1, andu is or 1.