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Abstract

A linear addition polymer having sidegroups which may be coupled to it or not through a spacer and have a molecular hyperpolarizability .beta. of at least 10.sup.-38 m.sup.4 /V, characterized in that the recurring units of the polymer correspond to the formula ##STR1## wherein X represents a hydrogen atom or a lower alkyl group and m=1 or optionally 0, where when m-1 Y represents a ##STR2## group and R has the meaning of (a) a hyperpolarizable group having a molecular hyperpolarizability .beta. of at least 10.sup.-38 m.sup.4 /V, in the presence or not of a spacer, and optionally along with (b) a mesogenic group in the presence or not of a spacer, and/or (c) a hydrogen atom or a substituted or unsubstituted organic group having not more than 30 carbon atoms, and when m=0 Y represents a --CN, a substituted or unsubstituted phenyl group or a group of the formula --OR.sub.1 or --CH.sub.2 OR.sub.1, wherein R.sub.1 has the meaning of a hydrogen atom or a substituted or unsubstituted aliphatic group having not more than 20 carbon atoms, provided that at least 10% of the recurring units in the polymer contain a hyperpolarizable group having a molecular hperpolarizability .beta. of at least 10.sup.-38 m.sup.4 /V, at the most 40% of the recurring units in the polymer contain a mesogenic group, and that the quotient of the degree of substitution of the recurring units with a group having a molecular hyperpolarizability .beta. of at least 10.sup.-38 m.sup.4 /V and the average molecular weight of R with the meaning given under b and c amounts to at least 5.times.10.sup.-4, a non-linear optical medium thereof oriented in an electric field and electro-optical laminates comprising such a non-linear optical medium.

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First Claim