Patent ID: 7939484

Claim:
A method for reducing the adhesion forces between a hard surface and subsequently occurring soil characterized in that the method comprises the step of treating the hard surface with a liquid composition comprising one or more copolymers A which comprise a2) 1 to 50% by weight of one or more of the repeating structural units of the formula (2) where R 3 , R 4 and R 5 are, independently of one another, hydrogen or methyl, R 6 is hydrogen or an n-aliphatic, isoaliphatic, olefinic, cycloaliphatic, arylaliphatic or aromatic (C 1 -C 30 )-hydrocarbon radical, Y is O or NH and m and n are the stoichiometric coefficients relating to the ethylene oxide units (EO) and propylene oxide units (PO) and are, independently of one another, 0 to 50, where the sum of m and n must on average be ≧1 and the distribution of the EO and PO units over the -[EO] m -[PO] n — chain may be random, block-like, alternating or gradient-like, and b) 49.99 to 98.99% by weight of one or more of the repeating structural units of the formula (3) where R 3 is hydrogen or methyl, Z is (C 1 -C 8 )-alkylene and X is selected from the group consisting of H + , Li + , Na + , K + , Mg ++ /2, Ca ++ /2, Al +++ /3, NH 4 + , monoalkylammonium, dialkylammonium, trialkylammonium and tetraalkylammonium, where the alkyl groups in these ammonium ions comprise, independently of one another, of from 1 to 30 carbon atoms.