| 摘要 |
PURPOSE:To contrive improvements in heat resistance, chemical resistance and strength (crushing strength), by a method wherein powder of specific end modified imido-oligomer is premolded at a specific molding temperature under molding pressure and then the premolded material is cured thermally by heating the same at a specific temperature or higher under a normal pressure. CONSTITUTION:Imido-oligomer is obtained by reacting biphenyl tetracarboxylic acid, an aromatic diamine chemical compound, unsaturated dicarboxylic acid and/or unsaturated monoamine in an organic solvent. Powdery body of end modified imido-oligomer, which possess an unsaturated end group in its oligomer end or imido-bond within oligomer and does not possesses the melting point of lower than 260 deg.C, is premolded at a molding temperature of 5-250 deg.C and by molding pressure of 0.1-10ton/cm<2>. Then the premolded material is cured thermally by heating at a temperature of 260 deg.C or higher under normal pressure and a molded product is obtained. |
