Importance

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Abstract

These prepolymers having maleimide functions (f) consist in the reaction products of at least one maleic anhydride represented by formula (I); of at least one compound (II) having at least one --NH.sub.2 function and at least another function F selected from the group consisting of --OH, --NH.sub.2, --NH--, --COOH, --COOR.sup.3 or --OOCR.sup.3 ; of at least one compound (III) capable of forming the chain of the prepolymers by polycondensation and/or polyaddition, said compound(s) (II) having first reacted with said maleic anhydride(s) (I) in order to open the maleic anhydride rings with formation of maleamic acid functions (f'), said maleamic acid functions having then been at least partially closed again under the action of heat into maleimides N-substituted by groups functionalized by a function F, the chain of said prepolymers having been formed by polycondensation and/or polyaddition of the N-substituted maleimide formed bearing the function F; of compound(s) (III) of uncyclized products bearing or not a function F formed simultaneously with said N-substituted maleimides of maleic anhydride(s) (I) which could have remained in excess after their opening by compound(s) (II); the functionalities and proportions of compounds (II) and (III) having been selected in order to exclude any gelation of the reaction medium. ##STR1## R.sup.1, R.sup.2 =H, C.sub.1 -C.sub.12 alkyl or halogen, R.sup.3 =C.sub.1 -C.sub.5 alkyl.

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First Claim