Patent ID: 6316066
Filing Date: 2001-11-13
Classification: C09K,G02F

Abstract:
A thermochromic polymerizable mesogenic composition comprising:a) a component MA comprising at least one achiral polymerizable mesogenic compound having at least one polymerizable functional group,b) a component MB comprising at least one chiral polymerizable mesogenic compound having at least one polymerizable functional group,c) a photoinitiator, andd) optionally a dye component, wherein the chiral polymerizable compound of component MB is one of formula IIIP--(Sp--X).sub.n --MG*--R* IIIin whichP is CH.sub.2.dbd.CW--COO--, WCH.dbd.CH--O--, ##STR24##or CH.sub.2.dbd.CH--phenyl-(O).sub.k --,W is H, CH.sub.3 or Cl,k is 0 or 1,Sp is a spacer group having 1 to 20 C atoms,X is --O--, --S--, --CO--, --COO--, --OCO--, --OCO--O--, --S--CO--, --CO--S-- or a single bond,n is 0 or 1MG*--R* is--(A.sup.1 --Z.sup.1).sub.i --G.sup.2 --(Z.sup.1 --A.sup.2).sub.j --R IIb,whereinZ.sup.1 is independently --COO--, --OCO--, --CH.sub.2 CH.sub.2 --, --OCH--, --CHO.sub.2 --, --CH.dbd.CH--, --CH.dbd.CH--COO--, --OCO--CH.dbd.CH--, --C.ident.C-- or a single bond,A.sup.1 and A.sup.2 are each independently 1,4-phenylene in which one or more CH groups are optionally replaced by N, 1,4-cyclohexylene in which one or two non-adjacent CH.sub.2 groups are optionally replaced by O and/or S, 1,4-cyclohexenylene, or naphthalene-2,6-diyl, A.sup.1 and A.sup.2 being unsubstituted, mono- or polysubstituted with halogen, cyano or nitro groups or alkyl, alkoxy or alkanoyl groups having 1 to 7 C atoms in which one or more H atoms are optionally substituted by F or Cl,R is halogen, cyano, an achiral alkyl radical with up to 25 C atoms, unsubstituted, mono- or polysubstituted by halogen or CN, one or more non-adjacent CH.sub.2 groups optionally being replaced, in each case independently from one another, by --O--, --S--, --NH--, --N(CH.sub.3)--, --CO--, --COO--, --OCO--, --OCO--O--, --S--CO--, --CO--S-- or --C.ident.C-- in such a manner that oxygen atoms are not linked directly to one another,G.sup.2 is ##STR25##i and j are each independently 0, 1 or 2, with the proviso that Z.sup.1 is not --COO--, --OCO-- or --CH.dbd.CH--COO-- where Z.sup.1 is adjacent to G.sup.2.