Non-linear optical active diols and polyurethanes prepared therefrom
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United States of America Patent
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Mar 19, 1991
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N/A
app pub date -
Jun 29, 1989
filing date -
Jul 4, 1988
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Expired
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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.
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