| 摘要 |
<p>PURPOSE:To obtain the title high purity compound useful as an adhesive in high yield and to suppress by-products by continuously or intermittently adding a specific aromatic polyamide to a reaction system comprising an alpha,beta-unsaturated dicarboxylic acid anhydride and a mixed solvent in the presence of an acid catalyst under reflux and dehydration under heating. CONSTITUTION:100 pts.wt. aromatic polyamide containing two or more primary amino group in the molecule is continuously or intermittently added to a reaction system comprising an alpha,beta-unsaturated dicarboxylic acid anhydride (the ratio to primary amino group of the aromatic polyamide is preferably 1-20 times mol) and 100-2,000 pts.wt. mixed solvent (comprising 60-99wt.% nonpolar solvent having azeotrope with water and 40-1wt.% aprotic polar solvent) in the presence of an acid catalyst under reflux and dehydration under heating to give an aromatic polyimide. The polyimide is crystallized and separated by cooling the reaction mixture prepared by the method to increase profits such as elimination of large amount of waste water treatment.</p> |
