METHOD TO INCREASE RESISTANCE AGAINST STAIN PENETRATION OF AQUEOUS COATING COMPOSITIONS

摘要

The invention also relates to a method to increase stain resistance andpenetration resistance of aqueous coating compositions which method comprisesproviding a coating composition which contain at least one pigment, at leastone film-forming polymer in the form of an aqueous polymer dispersion and atleast one anionic surfactant, wherein the anionic surfactant comprises atleast 85 % by weight, preferably at least 90 % by weight, more preferably atleast 95 % by weight, based on the total weight of ani- onic surfactant in thecoating composition, of at least one anionic surfactant S, which is selectedfrom semi-esters of sulfuric acid or phosphoric acid with an alcohol, whichalcohol carries at least one alkyl radical having from 8 to 30 carbon atoms oran alkyl substituted phenyl radical wherein alkyl has from 4 to 30 carbonatoms and which alco- hol may carry an oligo-C2-C3-alkylene-ether groupprovided that the number of repeat- ing units in the oligo-C2-C3-alkylene-ether group is at most 15, or a salt thereof.