Non-linear optiically active polyurethanes having high glass...

Details Non-linear optiically active polyurethanes having high glass... Non-linear optiically active polyurethanes having high glass...

C - Chemistry, Metallurgy

07

D

C07D 207/12 (2006.01) C08G 18/32 (2006.01) C08G 18/38 (2006.01) C08G 18/67 (2006.01) G02F 1/35 (2006.01) G02F 1/361 (2006.01)

Patent

CA 2139671

2139671 9401480 PCTABS00030 The invention relates to a non-linear optically active polyurethane comprising a polymeric main chain and a donor-.pi.-acceptor sidegroup, with the sidegroup comprising a rigid donor group which is also part of the polymeric main chain. By incorporating rigid donor groups into the non-linear optically active polyurethane a high glass transition temperature (Tg above 170 ·C) is obtained, and hence increased thermal stability. The invention further relates to non-linear optically active polyurethanes having a Tg above 170 ·C, and to non-linear optically active waveguides comprising non-linear optically active polyurethanes according to the invention. Suitable rigid donor groups include nitrogen- or sulphur-containing alicyclic groups. In particular, dihydroxy pyrrolidine groups in which the nitrogen atom is directly coupled to the .pi.-acceptor group and dithiafulvene groups were found to be highly suitable for obtaining non-linear optically active polyurethanes of good thermal stability and polarizability.

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