| abstract |
Surface sizing agents for paper containing aqueous or aqueous-alcoholic alkali metal, amine or ammonium salt solutions of copolymers of maleic anhydride and diisobutylene and, if appropriate, a vinyl monomer of the formula <IMAGE> I in which R designates H, -CH3, -C2H5, -OR2, -OCOCH3, <IMAGE> or -CH2-O-COCH3, R1 designates H or -CH3 and R2 designates alkyl, the anhydride groups of the copolymers being bis-esterified to the extent of 25-90 mol % with primary aliphatic monoalcohols with 1 to 12 C atoms. |