Patent ID: 7862785

Claim:
An aqueous composition which comprises sulfuric acid and at least one surfactant, wherein the surfactant, in a concentration of from 0.1 to 0.3% by weight in a 2% strength aqueous H 2 SO 4 solution, at 23Â° C., leads to a reduction in the contact angle on glass after 1 second by at least 10Â°, wherein the composition has a contact angle on glass of less than 40Â°, and the surfactant is a nonionic surfactant selected from the group consisting of an alcohol alkoxylate, an alkylpolyglucoside, an N-alkylpolyglucoside, an N-alkylglucamide, a fatty acid alkoxylate, a fatty acid polyglycol ester, a fatty acid amine alkoxylate, a fatty acid amide alkoxylate, a fatty acid alkanolamide alkoxylate, an N-alkoxypolyhydroxy-fatty acid amide, an N-aryloxypolyhydroxy-fatty acid amide, a block copolymer of ethylene oxide, a propylene oxide and/or a butylene oxide, a polyisobutene alkoxylate, a polyisobutene/maleic anhydride derivative, a fatty acid glyceride, a sorbitan ester, a polyhydroxy-fatty acid derivative, a polyalkoxy-fatty acid derivative and a bisglyceride, wherein said alcohol alkoxylate is an alcohol alkoxylate of formula (I): R 1 â€”Oâ€”(CH 2 â€”CHR 5 â€”Oâ€”) r (CH 2 â€”CH 2 â€”Oâ€”) n (CH 2 â€”CHR 6 â€”Oâ€”) s (CH 2 â€”CHR 2 â€”Oâ€”) m Hâ€ƒâ€ƒ(I) where R 1 is at least singly branched C 4-22 -alkyl, R 2 is C 3-4 -alkyl, R 5 is C 1-4 -alkyl, R 6 is methyl or ethyl, n has a mean value of from 1 to 50, m has a mean value of from 0 to 20, r has a mean value of from 0 to 50, s has a mean value of from 0 to 50, and m being at least 0.5 if R 5 is methyl or ethyl or r has the value 0.