| abstract |
These prepolymers containing maleimid functions (f) consist in reaction products of at least one maleic anhydride (I), of at least one compound (II) having at least one -NH2 function and at least one other function F: -OH, -NH2, -NH-, -COOH or -COOR3 or -OCOR?3 (R3 = C¿1-C5 alkyl) and at least one chain forming compound (III) by polycondensation and/or polyaddition; (II) having been first reacted with (I) to open the maleic anhydride cycles, with formation of maleamic acid functions (f) which have then been at least partially re-closed by heat to produce N-substituted maleimids by the groups functionalised by F; the chain having been formed by polycondensation and/or polyaddition of the N-substituted maleimid bearing function F of compound(s) (III), of non aromatised products bearing a function F or not formed at the same time as said N-substituted maleimids, and of the maleic anhydride(s) (I) which could have been in excess after being opened by the compound(s) (II); the functionalities and proportions of (II) and (III) having been selected so as to preclude a gelation of the reaction medium. In (f), (I), and (f'), R1, R2 = H, C1¿1?-C12 alkyl or halogen. |