| abstract |
The present invention relates to copolyethers constituted by copolymers of 7,oxa-bicyclo(2,2,1)-heptane, and its alkyl-derivatives, with one or more single-ring or condensed-rings cycloaliphatic ethers, comprising the characteristic group:n wherein Rʹ is hydrogen and Rʺ is H, a halogen, or an alkyl radical containing a small number of carbon atoms, possibly halogen-substituted. n If the ether contains one ring only, it contains from 5 to 12 atoms in the ring, and if it contains a condensed-rings system, it contains a total number of from 10 to 18 atoms in the rings. n Those copolyethers show an anisotropic behaviour in the molten state, and therefore are endowed with liquid-crystal properties. |