Patent ID: 8530671

Claim:
Method for preparing a material formed from arborescent-branched molecules comprising associative groups, the method comprising the following successive steps: (a) the reaction of at least one compound (A) that is at least trifunctional bearing first, second and third functions which are identical or different and chosen from acid, ester or acyl chloride functions, with at least one compound (B) that is at least bifunctional having at least two functions which are identical or different and chosen from epoxy, alcohol or amine functions, the functions of compound (B) reacting with the first functions of compound (A), wherein the number ratio of the functions of compound (B) to the sum of the first functions of compound (A) ranges from 0.1 to 0.8, to obtain a compound or compounds from step (a) which still contains free acid, ester or acyl chloride functions; and (b) the reaction of the compound or compounds obtained in step (a) with at least one compound (C) bearing, on the one hand, at least one reactive group capable of reacting with the second functions of (A) which reactive group is chosen from the primary or secondary amine or alcohol groups, and, on the other hand, at least one associative group, said compound (C) being of formula (C1), (C2) or (C3): where R denotes a unit containing at least one primary or secondary amine or alcohol group, R′ denotes a hydrogen atom, and A denotes an oxygen or sulphur atom or an —NH group.