PROBLEM TO BE SOLVED: To provide a high molecular compound having a nonlinear optical characteristic, together with a high nonlinear optical constant and thermal stability by specifying the constitution of a side chain type quadratic nonlinear itaconate copolymer. ;SOLUTION: A quadratic nonlinear itaconate copolymer of side chain type shown by the formula I is used, where the ITCN-NLO unit is a substitution itaconate unit shown by the formula II, the MO unit is such a unit as capable of forming a copolymer with the ITCN-NLO unit, and (m) and (n) stand for the numerals where (m+n) is between 5 and 10,000, and m/(m+n) between 0.05 and 0.95. In the formula II, X shows an alkylene group having a single bond and carbons between 1 and 12, or a bivalent aromatic hydrocarbon group having carbons between 6 and 12, and Y shows a bivalent bond selected from a group of an ether bond, an ester bond, an amide bond, an alkyl imino bond having carbons between 1 and 5, a sulfon bond or the like. Also, NLO shows a quadratic nonlinear optically activated group as a conjugate aromatic group not substituted or substituted by an electron donating group and/or an electron attractive group.;COPYRIGHT: (C)1998,JPO
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