Abstract: A positive photosensitive polymer composition, which comprises a thermosetting polymer precursor which can be cured through cyclodehydration upon heating, and a photosensitive cure accelerator which can be inactivated of its cure accelerating property by irradiation of light.

Abstract: A polyimide precursor composition, which comprises, a polyamic acid having a repeating unit represented by the following general formula (PA), and at least one kinds of cure accelerator selected from the group consisting of a substituted or unsubstituted nitrogen-containing heterocyclic compound exhibiting an acid dissociation index "pKa" of a proton complex ranging from 0 to 8 in an aqueous solution thereof, or an N-oxide compound of said nitrogen-containing heterocyclic compound (AC1), a substituted or unsubstituted amino acid compound (AC2), and an aromatic hydrocarbon compound or an aromatic heterocyclic compound having a molecular weight of 1,000 or less and two or more hydroxyl groups (AC3): ##STR1## wherein .phi. is a quadrivalent organic group, .phi. is a bivalent organic group, R is a substituted or unsubstituted hydrocarbon group, organosilicic group or hydrogen atom.

Abstract: A polyimide precursor having a molecular structure obtained by polymerizing (a) 0.97 to 1.03 molar equivalent of a diamine component containing 0.40 molar equivalent or more of aromatic diamine compound represented by the general formula (DA1), and (b) an acid anhydride component containing (1-n.sub.1 /2) molar equivalent of a tetracarboxylic dianhydride and n.sub.1 molar equivalent of at least one selected from the group consisting of maleic anhydride and maleic derivative anhydride, wherein n.sub.1 ranges from 0.02 to 0.40.

Abstract: Hydrazone compound useful as an excellent organic nonlinear optical material and a highly sensitive coloring chelation agent, represented by the following formula (1): ##STR1## wherein Ar is a substituted or an non-substituted 2-imidazolyl group, a 4-imidazolyl group, 3-pyrazolyl group, 3-pyridazinyl, 2-pyrimidinyl, 4-pyrimidinyl, 2-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 1-phthalazinyl, 2-quinazolinyl, 2-benzimidazolyl, 2-benzothiazolyl, or 2-thiazolyl group,R.sup.1 is a nitro group, cyano group or trifluoromethyl group,R.sup.2 is a nitro group, cyano group, trifluoromethyl group or a halogen atom, or a substituted or an non-substituted alkyl group,R.sup.3 is a hydrogen atom, andn is an integer from 0 to 3.

Abstract: Disclosed is an organic nonlinear optical material made of heterocyclic compound which is represented by general formula (I) shown below. ##STR1## wherein Z.sub.1 is O, S, Se, Te, SO.sub.2 group or NR.sub.1 group; Z.sub.2 is N or CR.sub.2 group; Y is O, S or NR.sub.3 group; X is CR.sub.4 R.sub.5 group, NR.sub.6 group, O or S; and R, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 may be identical to or different from each other, and each of them is heterocyclic group, aromatic hydrocarbon group, aliphatic hydrocarbon group or alicylic hydrocarbon group, which may be unsubstituted or substituted, characteristic group or H, where R.sub.4 and R.sub.5 may jointly form a carbocyclic or a heterocyclic ring.