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US 4,637,896 AGranted
Polymeric liquid crystals
AssigneeArmstrong World Industries, Inc.
InventorPaul J. Shannon
Life of this patent
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Abstract
The present invention concerns novel cholesteric liquid crystalline monomers and combinations thereof with materials that will support formation of a mixture which demonstrates cholesteric liquid crystalline properties. These materials may be formed as coatings, heated or cooled to a desired temperature to cause the cholesteric coating to exhibit a desired optical response, and photopolymerized to essentially fix the optical characteristics of the resulting polymer.
Claims16
A polymeric coating exhibiting a fixed cholesteric optical response, said coating being obtained by photopolymerizing a composition comprising
- a photopolymerizable monomer having the structure:
- ##STR7## where R.sub.1 =H or CH.sub.3, A=--R.sub.2 --, --R.sub.3 O--, or --R.sub.4 O--, R.sub.2 =an alkylene chain having from 3-14 methylene or lower alkyl-substituted methylene groups, R.sub.3 =an alkylene chain having from 2-14 methylene or lower alkyl-substituted methylene groups, R.sub.4 =an alkylene ether, diether or triether having a total of from 3-14 carbon atoms in the alkylene moieties, provided that the terminal alkylene moiety adjacent the carbonate moiety comprises not less than two carbon atoms, and y=0 or 1;
- and
- a suitable photoinitiator, said composition having exhibited cholesteric liquid crystalline properties at the time photopolymerization occurred.
1 more element
Dependencies are inferred from the claim text.