Patent ID: 7862785
Filing Date: 2011-01-04
Classification: C22B,C23F,Y02P

Abstract:
1. 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 23° C., leads to a reduction in the contact angle on glass after 1 second by at least 10°, wherein the composition has a contact angle on glass of less than 40°, 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): where R R R R 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