| abstract |
t. METHOD FOR PRODUCING AN IMID-CONTAINING PREPS | LYMER by high-temperature gtolikondensation of an excess of aromatic d- and / or polyisocyanate with Dianhydride tetracarboxylic acid in the presence of a catalyst, moreover, in the presence of Hitfie Och5g5.r% of tetrachloride. what. in order to simplify the preparation technology and improve the quality of the prepolymer, sulfsalicylic acid or benzenesulfonylamide is used as a catalyst. 2. The method according to claim 1, wherein the catalyst is cMieCb sulfosalicylic acid or benzene sufonylamide with dimethylformamide or dimethylacetamide. taken in a mass ratio from 1: 1.5 to 1: 37.5. h |