Polymers containing mesogenic groups and dye radicals in the side chains
First Claim
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1. A polymer, wherein the polymer chain comprises monomers of the formula:
- ##STR25## wherein R1 is hydrogen or methyl, X is --O-- or --N--R4 ;
R is a linear or branched C2 -C12 -alkylene group which is uninterrupted or interrupted by one or more of the groups --O--, --S-- or --N--R4 ;
R2 is a radical of the formula;
##STR26## where Y is ##STR27## and Z is a chemical bond or ##STR28## R5 is hydrogen, C1 -C12 -alkyl, C5 -C7 -cycloalkyl, C1 -C12 -alkoxy, C1 -C12 -alkoxycarbonyl, C2 -C12 -alkanoyloxy, fluorine, chlorine, bromine, cyano or nitro, and R6 is hydrogen, C1 -C12 -alkyl, C1 -C12 -alkoxy or C1 -C12 -alkoxycarbonyl;
R3 is the radical of a pleochroic dye comprising anthraquinone, stilbene, monoazo, bisazo and trisazo dyes, which is bonded to R via ##STR29## or an imide group; and
R4 is hydrogen or unsubstituted or substituted C1 -C4 -alkyl, and which contains from 0.1 to 40% by weight, based on the polymer, of the R3 dye radicals.
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Abstract
The polymer chain comprises
(a) one or more monomers possessing a nematogenic, chiral or smectogenic group, or a mixture of monomers possessing a nematogenic group with those possessing a chiral group, and
(b) one or more monomers possessing a radical of a pleochroic dye, and the nematogenic, the chiral and the smectogenic groups are bonded to the polymerizable group either directly or, like the dye radicals, via a spacer.
The polymers can be used, together with low molecular weight liquid crystals or liquid crystal mixtures, in electrooptical displays.
91 Citations
6 Claims
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1. A polymer, wherein the polymer chain comprises monomers of the formula:
- ##STR25## wherein R1 is hydrogen or methyl, X is --O-- or --N--R4 ;
R is a linear or branched C2 -C12 -alkylene group which is uninterrupted or interrupted by one or more of the groups --O--, --S-- or --N--R4 ;
R2 is a radical of the formula;
##STR26## where Y is ##STR27## and Z is a chemical bond or ##STR28## R5 is hydrogen, C1 -C12 -alkyl, C5 -C7 -cycloalkyl, C1 -C12 -alkoxy, C1 -C12 -alkoxycarbonyl, C2 -C12 -alkanoyloxy, fluorine, chlorine, bromine, cyano or nitro, and R6 is hydrogen, C1 -C12 -alkyl, C1 -C12 -alkoxy or C1 -C12 -alkoxycarbonyl;
R3 is the radical of a pleochroic dye comprising anthraquinone, stilbene, monoazo, bisazo and trisazo dyes, which is bonded to R via ##STR29## or an imide group; and
R4 is hydrogen or unsubstituted or substituted C1 -C4 -alkyl, and which contains from 0.1 to 40% by weight, based on the polymer, of the R3 dye radicals. - View Dependent Claims (2, 3, 4, 5, 6)
- ##STR25## wherein R1 is hydrogen or methyl, X is --O-- or --N--R4 ;
Specification
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Current AssigneeBASF AG (BASF SE)
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Original AssigneeBASF AG (BASF SE)
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InventorsPortugall, Michael, Ringsdorf, Helmut, Etzbach, Karl H., Schmidt, Hans W.
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Primary Examiner(s)Gron, Teddy S.
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Assistant Examiner(s)Kilby, Catherine S.
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Application NumberUS06/685,213Time in Patent Office727 DaysField of Search350/349, 350/340, 350/341, 252/299.1, 252/299.01, 526/259, 526/304, 526/312, 526/321, 526/262, 526/305, 526/313, 526/288, 526/292.2, 526/292.3US Class Current526/259CPC Class CodesC08F 246/00 Copolymers in which the nat...C09K 19/3833 with mesogenic groups in th...C09K 19/3852 Poly(meth)acrylate derivatives
