Liquid crystalline colorant polymer
AssigneeRoehm GmbH Chemische Fabrik
InventorMichael May
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Abstract
The invention relates to liquid crystalline polymers which form exclusively nematic liquid crystalline phases. The liquid crystalline polymers are comprised of units of at least trinuclear liquid crystalline azo dye monomers M with lateral asymmetry.
Claims8
A liquid crystalline polymer which forms exclusively a nematic liquid crystalline phase comprising repeating units derived from one or more liquid crystalline azo dye monomers M having formula I:
- ##STR14## wherein R is hydrogen or methyl;
- R.sub.1 is an alkyl group of 1 to 8 carbon atoms, or a halogen substituent;
- X is a --COO--or --N.dbd.N--group;
- Y is a --COO--or --N.dbd.N--group;
- n is an integer from 6 to 11;
- m is 0 or 1;
- Z is oxygen;
- and A is an aromatic group having lateral asymmetry;
- with the provision that X and Y are each different or both are azo groups, wherein said polymer comprises units derived from said monomer M in an amount of from 5 to 100%.
A liquid crystalline polymer which forms exclusively a nematic liquid crystalline phase comprising repeating units derived from one or more liquid crystalline azo dye monomers M having formula I:
- ##STR17## wherein R is hydrogen or methyl;
- R.sub.1 is an alkyl group of 1 to 8 carbon atoms, or a halogen substituent;
- X is a --COO--or --N.dbd.N--group;
- Y is a --COO--or --N.dbd.N--group;
- n is an integer from 1 to 11;
- and m is 0 or 1;
- wit the provision that X and Y are each different or are both --N.dbd.N--groups, wherein said polymer comprises units derived from said monomer M in an amount of from 5 to 100 wt.%.
Dependencies are inferred from the claim text.