Patent ID: 6046290
Filing Date: 2000-04-04
Classification: C07C,C08F,C09K,G11B

Abstract:
A polymer having a main chain as a backbone and, branching therefrom, covalently bonded side groups of the formulae--S.sup.1 --T.sup.1 --Q.sup.1 --A (I) and--S.sup.2 --T.sup.2 --Q.sup.2 --M (II)whereinS.sup.1 and S.sup.2 denote the atoms O or S or the radical NR.sup.0, or COOR.sup.0 denotes hydrogen or C.sub.1 -C.sub.4 -alkyl,T.sup.1 and T.sup.2 denote the radical (CH.sub.2).sub.n, which can optionally be interrupted by --O--, --NR.sup.0 -- or --OSiR.sup.0.sub.2 O-- and/or can optionally be substituted by methyl or ethyl,Q.sup.1 and Q.sup.2 denote a direct single bond, --O--, --COO--, --OCO--, --CONR.sup.0, --NR.sup.- CO.sup.0 -- or --NR.sup.0 --, orS.sup.1 T.sup.1 Q.sup.1 or S.sup.2 T.sup.2 Q.sup.2 denotes a bivalent group of the formula ##STR26## A denotes a unit which can absorb electromagnetic radiation, M denotes a mesogenic unit anisotropic in shape andn denotes an integer from 2 to 12,wherein A has an extinction modulus .DELTA..DELTA.E of greater than 0.2, measured on a compound of the formula A--Q.sup.1 H or AQ.sup.1 T.sup.1 S.sup.1 H by 6 individual measurements:A) A--Q.sup.1 H or AQ.sup.1 T.sup.1 S.sup.1 H in the lowest possible concentration in a solvent of the lowest possible polarity,B) standard in the highest possible concentration in the same solvent,C) A--Q.sup.1 H or AQ.sup.1 T.sup.1 S.sup.1 H and standard in the concentration as above in the same solventmeasured in each case twice at the longer-wavelength edge of the absorption curve, and measured once at a wavelength .lambda. at which the extinction of curve C is 0.8, and once at a wavelength .lambda.+50 nm, the three differences of the extinction .DELTA.E.dbd.E.sub..lambda.+50 being obtained for the ingredients A) to C), and the three values .DELTA.E.sub.A and .DELTA.E.sub.B and .DELTA.E.sub.C being obtained, the value .DELTA..DELTA.E sought then being the difference .DELTA..DELTA.E=.DELTA.E.sub.C -(.DELTA.E.sub.B +.DELTA.E.sub.A), and with the proviso that the polymer does not include group A having the formula: ##STR27## wherein R.sup.14 to R.sup.16 independently of one another denote C.sub.1 -C.sub.6 -alkyl, hydroxyl, C.sub.1 -C.sub.6 -alkoxy, phenoxy, C.sub.1 -C.sub.6 -alkylthio, phenylthio, halogen, CF.sub.3, CCl.sub.3, CBr.sub.3, nitro, cyano, C.sub.1 -C.sub.6 -alkylsulphonyl, phenylsulphonyl, COOR.sup.1, aminosulphonyl, C.sub.1 -C.sub.6 -alkylaminosulphonyl, phenylaminosulphonyl, aminocarbonyl, C.sub.1 -C.sub.6 -alkylaminocarbonyl or phenylaminocarbonyl,R.sup.17 denotes halogen, C.sub.1 -C.sub.6 -alkyl, hydroxyl, C.sub.1 -C.sub.6 -alkoxyl, phenoxy, C.sub.1 -C.sub.4 -acylamino or C.sub.1 -C.sub.4 -alkylsulphonylamino,R.sup.18 denotes halogen, C.sub.1 -C.sub.6 -alkyl, hydroxyl, C.sub.1 -C.sub.6 -alkoxy or phenoxy andX.sup.1 denotes hydrogen, hydroxyl, mercapto, CF.sub.3, CCl.sub.3, CBr.sub.3, halogen, cyano, nitro, COOR.sup.19, C.sub.1 -C.sub.6 -alkyl, C.sub.5 -C.sub.12 -cycloalkyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.1 -C.sub.12 -alkylthio, C.sub.6 -C.sub.12 -aryl, C.sub.6 -C.sub.12 -aryloxy, C.sub.6 -C.sub.12 -arylthio, C.sub.1 -C.sub.6 -alkylsulphonyl, C.sub.6 -C.sub.12 -arylsulphonyl, aminosulphonyl, C.sub.1 -C.sub.6 -alkylaminosulphonyl, phenylaminosulphonyl, aminocarbonyl, C.sub.1 -C.sub.6 -alkylaminocarbonyl, phenylaminocarbonyl, NR.sup.19 R.sup.20, NH-CO-R.sup.19, NH-SO.sub.2 -R.sup.19, NH-CO-NR-.sup.19 R.sup.20, NH-CO-O-R.sup.19 or SO.sub.2 -CF3, wherein R.sup.19 and R.sup.20 independently of one another represent hydrogen, C.sub.1 -C.sub.4 -alkyl or phenyl.