Procedimiento para preparar dispersiones acuosas de polímero de vinilo

摘要

The invention relates to a process for the preparation of aqueous vinyl polymer dispersions having good film forming properties, good stability and in can clarity, to the polymer dispersions obtainable by the process and coating compositions prepared from said polymer dispersions and the use thereof, said process comprising a first emulsion polymerisation step of a first monomer mixture, a sulfur based anionic surfactant containing less than 60 wt% ethylene oxide and a salt content at the start of polymerization is between 0.01 and 3 gr/kg water and a second polymerization step of a second monomer mixture wherein carboxylic acid functional monomers is present in an amount such that the acid value of the resulting polymer is less than 23 KOH/g.