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US 5,001,209 AGranted
Non-linear optical active diols and polyurethanes prepared therefrom
AssigneeAkzo N.V.
InventorsCarel T. J. Wreesmann, Doetze J. Sikkema, Erwin W. P. Erdhuisen
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Abstract
Polyurethanes having high hyperpolarizability densities and other favorable properties can be easily prepared from nonlinear optical active diols (NLO-diols) of a certain general formula, which have a delocalized .pi. electron system to which both an electron donor group and an electron acceptor group are coupled directly (D.pi.A system). The polyurethanes may be used in optical waveguides.
Claims5
A polyurethane comprised of the reaction product of a diisocyanate and at least one diol of the formula:
- ##STR11## wherein D is a trivalent donor group having 2-10 aliphatic carbon atoms and containing at least one alkoxy-oxygen atom or a nitrogen atom forming a tertiary amine, the oxygen or nitrogen atom being linked directly to the benzene ring attached to said donor group, and wherein
- R.sub.1 =halogen, R.sub.2, OR.sub.2, COR.sub.2, COOR.sub.2, CN or CF.sub.3;
- R.sub.2 =H or an alkyl group having 1-3 carbon atoms;
- Y=CR.sub.2, C--CN, or N;
- ##STR12## A=CN, NO.sub.2, CH.dbd.C(CN).sub.2, or CF.sub.3 ;
- and
- n=0-4.
4 more elements
Dependencies are inferred from the claim text.