Abstract: Binder for a pressure sensitive adhesive, characterized in that it exists as a polymer dispersed in water and obtained by emulsion polymerization of:(A) 65.0-99.4 percent by weight of one or more acrylic esters with 4-18, preferably 6-10 carbon atoms in the alcohol part of the ester, the esters being selected in such a way that a polymerization of only these esters gives a tacky polymer with a Tg-value below 0.degree. C., preferably below -20.degree. C.(B) 2.0-0.1 percent by weight of a polymerizable compound with the formula ##STR1## or with the formula wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined in the specification(C) 5.0-0.5 percent by weight of at least one ethylenically unsaturated acid such as acrylic acid, methacrylic acid or itaconic acidand(D) 28.