Crosslinkable material which may be used in opto-electronics, process for producing this material, and monomer allowing this material to be obtained

Crosslinkable material containing a polymer which has a chain on which are laterally grafted chromophores that are active in nonlinear optics and that may be oriented under the effect of a polarizing electric field, the said chromophores each containing anchoring functional groups in order to stabilize their orientation by crosslinking, characterized in that each chromophore is within a polymer unit which corresponds to the following formula (I):

• ##STR19## in which:
• X represents a part of the polymer chain,
• A is a group --NO.sub.2, --CN, --C(CN).dbd.C(CN).sub.2 or --SO.sub.2 R.sub.4, R.sub.4 being an optionally halogenated C.sub.1 to C.sub.6 alkyl group,
• D is a nitrogen, sulphur or oxygen atom,
• R.sub.1 is a hydrogen atom or a C.sub.1 to C.sub.6 alkyl group if D is a nitrogen atom, or nothing if D is a sulphur or oxygen atom,
• R.sub.2 is a C.sub.1 to C.sub.6 aliphatic alkyl group,
• and E is a group chosen from --OH, --O--CO--(CH.sub.2).sub.n --COOH, --O--W, --O--CO--R.sub.3 --O--W and --O--R.sub.3 --O--W, n being an integer between 1 and 6, W being a photodimerizable group and R.sub.3 being a C.sub.1 to C.sub.6 alkyl group, E constituting the anchoring functional group,
• and the said material additionally containing complementary anchoring functional groups capable of attaching themselves to the anchoring functional groups carried by the chromophores during the crosslinking.