| abstract |
The invention relates to a mixture containing i) at least one condensation product (A) obtained by the reaction of a1) at least one aromatic or heteroaromatic, a2) at least one carbonyl compound, a3) optionally at least one sulphonating agent and a4) optionally at least one urea derivative, said condensation product (A) having an Mw value = 9000 g/mol, and containing ii) at least one tannin with an Mw value <=3000 g/mol. |