Patent ID: 8530544

Claim:
A method for preparing macromolecular species with a modified surface, comprising a step (e) in which macromolecular species (M) carrying —OH, or —SH, or —OH and —SH functions is brought into contact with a catalyst (C) carrying at least one conjugated guanidine function and reactive species (E) comprising at least one reactive group selected from the group consisting of i) an α,β-unsaturated carbonyl group C═C—C═O, an α,β-unsaturated thiocarbonyl group C═C—C═S, ii) a heterocyclic group comprising from 3 to 5 ring members and selected from the group consisting of cyclic ethers, cyclic thioethers, and aziridine rings, iii) an isocyanate group —N═C═O, a thioisocyanate group —N═C═S, and a trivalent group of formula >C═CZ— where Z is an electron-withdrawing group, and iv) mixtures thereof.