Nlo side chain polymers having low optical loss

Details Nlo side chain polymers having low optical loss Nlo side chain polymers having low optical loss

G - Physics

02

F

G02F 1/35 (2006.01) C08G 18/42 (2006.01) C08G 18/67 (2006.01) C08G 18/77 (2006.01) C08G 18/83 (2006.01) C08G 63/16 (2006.01) C08G 63/68 (2006.01) C08G 63/682 (2006.01) C08G 64/00 (2006.01) G02F 1/361 (2006.01)

Patent

CA 2146341

The invention relates to an NLO side chain polymer which exhibits low optical attenuation and is obtainable by reacting an NLO monomer in the form of a difunctional compound comprising a donor-.pi.-acceptor group with at least a first comonomer in the form of a difunctional compound reactive towards the NLO monomer and comprising an organic group, with hydrogen at- oms in the organic group which is part of the first comonomer having been replaced by heavier elements such as deuterium or ha- logen, notably fluorine and/or chlorine. The comonomer may be per-substituted; alternatively, use may be made of two or more comonomers of different substitutions. More particularly, the invention relates to NLO polyesters, polycarbonates and polyure- thanes made up of D.pi.A group-containing dihydroxy compounds and deuterated or halogenated dicarboxyl compounds, bisch- loroformates or diisocyanates known in themselves. The polymers are used as waveguides in, for instance, electro-optical devices such as an optical switch.

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