Mitsubishi Petrochemical Company Limited

Manabu Kishimoto

Iwao Seo

Kenji Nakajima

Atsushi Oda

Yukiko Fujimoto

Yukiko Ohashi

Dechun Zou

There is disclosed an organic nonlinear optical material which comprises a polymer having the following constitutional units, in amounts of 5 to 100 mole % of (I) and 0 to 95 mole % of (II), and a weight average molecular weight (Mw) of the polymer being 10,000 to 2,000,000. ##STR1## wherein the symbols represent the same meanings as defined in the specification. ##STR2## A nonlinear optical element has large nonlinear optical effect and yet is excellent in molding processability so that it can be widely applied to the filed of optical processings.

Organic nonlinear optical materials derived from vinylidene

There is disclosed an organic nonlinear optical material which comprises a polymer having the following constitutional units, in amounts of 5 to 100 mole % of (I), 0 to 50 mole % of (II) and 0 to 50 mole % of (III), and a weight average molecular weight (Mw) of the polymer being 10,000 to 2,000,000: ##STR1## wherein m, n, X, Y and A have the meanings as defined in the specification, ##STR2## wherein R.sup.2 represents an alkyl group, and ##STR3## A nonlinear optical element which is tough with wide surface as well as having large nonlinear optical effect can be obtained.

Vinylidene cyanide-vinyl benzoate derivative nonlinear optical polymers

Disclosed is a vinylidene cyanide copolymer obtained by copolymerization of vinylidene cyanide and two kind of vinyl compounds. By formation of a ternary copolymer, a monomer difficultly copolymerizabke with vinylidene cyanide can be incorporated into the polymer, and high piezoelectric performance can be obtained when polarized.

Vinylidene cyanide copolymer

A vinylidene cyanide copolymer obtained by copolymerizing vinyldene cyanide represented by formula (I) ##STR1## and a vinyl compound represented by formula (II) ##STR2## wherein Z represents a hydrogen atom or a saturated hydrocarbon group having from 1 to 6 carbon atoms; when Z is a hydrogen atom, R represents C.sub.n H.sub.2n+1 COO--, wherein n represents 0 or an integer of from 4 to 9; and when Z is a saturated hydrocarbon group, R represents CH.sub.3 COO-- or a group having a benzene ring. The copolymer is excellent in transparency and provides an electret exhibiting excellent pyroelectricity or piezoelectricity upon polarization.

Piezoelectric or pyroelectric material

An optical material obtained by electrically polarizing a high polymer molded article obtained from a composition comprising a copolymer of vinylidene cyanide and at least one comonomer selected from vinyl compounds, other vinylidene compounds and dienes having uniformly dispersed therein from 0.1 to 70% by weight of an organic molecular crystal having nonlinear optical effects, with the total amount of the copolymer and the organic molecular crystal being 100% by weight. The optical material has excellent orientation of the organic molecular crystal, great nonlinear optical effects, and excellent moldability.

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Ami, Japan

Manabu Kishimoto