| 摘要 |
PURPOSE: To obtain a polyimide molding excellent in uniformity in thickness, surface smoothness, and abrasion resistance by producing a polyimide precursor for polyimide extrusion and imidizing the precursor by extrusion. CONSTITUTION: A polyimide precursor soln. is obtd. by reacting an arom. tetracarboxylic dianhydride with an arom. diamine in a good solvent for the precursor. A compd.-mixed precursor soln. is obtd. by adding a function-giving substance to the precursor soln. The compd.-mixed precursor soln. is dispersed in a poor solvent to give a precipitate, which is dried at 0-100 deg.C to give an extrusion compsn. comprising 30-60wt.% compd.-mixed polyimide precursor, 0.1-5wt.% poor solvent, and 35-69.9wt.% good solvent and having a melt index of 10-30g/10min. The compsn. is extruded at 50-100 deg.C and imidized by dehydration by heating at 250-500 deg.C for 0.5-3hr, giving a polyimide molding. |
