Abstract: A thermosetting solution composition composed of a biphenyltetracarboxylic acid compound containing a partial lower aliphatic alkyl ester of 2,3,3?,4?-biphenyltetracarboxylic acid and/or a partial lower aliphatic alkyl ester of 2,2?,3,3?-biphenyltetracarboylic acid, an aromatic diamine compound in a molar amount larger than a molar amount of the biphenyltetracarboxylic acid compound, a partial lower aliphatic alkyl ester of 4-(2-phenylethynyl)phthalic acid compound in a molar amount as much as 1.8-2.2 times a molar amount corresponding to a difference between the molar amount of the aromatic diamine compound and the molar amount of the biphenyltetracarboxylic acid compound, and an organic solvent composed of a lower aliphatic alcohol is of value for manufacture of a prepreg.

Abstract: A friction material characterized by using a resin composition for friction materials, the resin composition containing, as a binder, an aromatic imide oligomer having an addition-reactive group at an end thereof. Also described is a resin composition for friction materials, containing: a powder of an aromatic imide oligomer having an addition-reactive group at an end thereof; at least one type of fiber selected from the group consisting of carbon fiber, aramid fiber, glass fiber, ceramic fiber, and metal fiber; and an inorganic filler. The friction material and a resin composition for friction materials have good formability and in which the binder itself has excellent heat resistance and mechanical properties, compared to a friction material using a phenolic resin as a binder.

Abstract: A friction material characterized by using a resin composition for friction materials, the resin composition containing, as a binder, an aromatic imide oligomer having an addition-reactive group at an end thereof. Also described is a resin composition for friction materials, containing: a powder of an aromatic imide oligomer having an addition-reactive group at an end thereof; at least one type of fiber selected from the group consisting of carbon fiber, aramid fiber, glass fiber, ceramic fiber, and metal fiber; and an inorganic filler. The friction material and a resin composition for friction materials have good formability and in which the binder itself has excellent heat resistance and mechanical properties, compared to a friction material using a phenolic resin as a binder.

Abstract: A polyimidosiloxane material useful for forming, on a flexible substrate material, a flexible protective coating layer with a high heat resistance, electrical insulating property and curl-resistance, comprises a polymerization-imidization product of an aromatic tetracarboxylic acid component comprising, as a principal ingredient, 2,3,3',4'-biphenyltetracarboxylic dianhydride with a diamine component comprising, as a principal ingredient, a diaminopolysiloxane compound of the formula (I) ##STR1## wherein R.sub.1 is a divalent hydrocarbon residue, R.sub.2 is an C.sub.1-3 alkyl or phenyl group, n is an integer of 3 to 30, and is preferably used, optionally together with an epoxy resin, in the form of a solution or dispersion in an organic solvent to coat a flexible substrate material, for example, a flexible circuit element, therewith.

Abstract: An electrodeposition resinous paint composition comprising (a) a modified alkyd resin, (b) a melamine resin, (c) a water-soluble silicone resin and (d) an inorganic filler, in which these components (a), (b), (c) and (d) are contained in the following ratios by weight:[(a)/[(a)+(b)]]=0.4-0.9;[(c)/[(a)+(b)]]=0.01-0.1;and[(d)/[(a)+(b)+(c)]]=0.1-1.0.

Abstract: There is disclosed a process for preparing a 1,2,4-triazole-3-carboxamide represented by the formula: ##STR1## wherein, R.sup.1 and R.sup.2 represent independently a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, or both R.sup.1 and R.sup.2 represent an alkylene group linked with each other directly or through an oxygen atom or a nitrogen atom to form a ring together with the nitrogen atom to which they are attached,which comprises subjecting an oxamohydrazide represented by the formula: ##STR2## wherein R.sup.1 and R.sup.2 have the same meanings as defined above,to reaction with formamidine or a salt thereof.