Crosslinked copolymer, preparation method and printing paste comprising said copolymer

A crosslinked copolymer obtained by precipitation polymerization of at least:

• 60 mol % to 99.8 mol % of at least one anionic monomer comprising at least one carboxylic acid function,
• 0.1 mol % to 20 mol % of at least one hydrophobic monomer of formula (I),
• wherein:
• R1, R2 and R3 are, independently of each other, a hydrogen atom or a methyl group,
• X is a group C(═O)—O—Y or CH2—C(═O)—O—Y,
• wherein Y is a hydrocarbon group, saturated or unsaturated, wherein Y is linear, branched, cyclic, or aromatic, wherein Y comprises 3 to 30 carbon atoms, and from 0 to 4 heteroatoms selected from the group consisting of O, N, and S,
• 1*10−9 mol % to 2 mol % of at least one crosslinking agent,
• the crosslinked copolymer being having 30 mol % to 90 mol % of the carboxylic acid functions of the anionic monomer in salified form prior to the precipitation polymerization,
• the solvent used for the precipitation polymerization comprising at least one alcohol comprising 1 to 4 carbon atoms, and
• the copolymer being obtained in the absence of water-soluble non-ionic monomers.