A comb copolymer consisting of a polymer backbone on which lateral macromonomer segments are grafted, characterised in that said polymer backbone consists: Of more than 55% and up to 90% molar of monomeric units from 2-methyl-2-[(1-oxo-2-propenyl)-amino]-1 -propanesulphonic acid (hereinafter referred to as ATBS), Of between 1% and 20 % molar, and more specifically of between 4% and 15% molar, either of monomeric units from a cationic monomer or of monomeric units from a monomer of formula (I): CH2=C(R1)-C(=0)-Y-(CH2)m-N(R2)(R3) in which m represents a number of between 1 and 4, Y represents O or NH, R-i represents a hydrogen atom or a methyl radical, R2 and R3, identical or different, represent a methyl radical or an ethyl radical； - Optionally of 0.005% molar to 1% of monomeric units from at least one cross-linking monomer comprising at least two carbon-carbon double bonds, and in that said lateral macromonomer segments are, for 100% molar constituting said comb copolymer, derived from the polymerisation of 9% to 30% molar of N-alkyl acrylamide or Ν,Ν-dialkyl acrylamide of formula (II): CH2=C(R4)-C(=0)-N(R5)(R6), in which R4 represents a hydrogen atom or a methyl radical and R5 and R6 represent, independent of each other, a hydrogen atom or an alkyl radical comprising 1 to 3 carbon atoms, it being understood that at least one of the R5 or R6 radicals does not represent a hydrogen atom, the method for the preparation and the use thereof as a thickener in cosmetics.Copolymère en peigne constitué d'un squelette polymérique sur lequel sont greffés des segments latéraux macromonomériques, caractérisé en ce que ledit squelette polymérique est constitué : De plus de 55 % jusqu'à 90 % molaires, d'unités monomériques issues de l'acide 2-méthyl 2-[(1-oxo 2-propènyl) amino] 1 -propanesulfonique (dénommé ci-après ATBS), De 1 % à 20 % molaire, plus particulièrement de 4 % à 15 % molaire, soit d'unités monomériques issues d'un monomère cationique soit, d'unités monomériques issu
