EMULSIFIED VINYLIC COPOLYMER FOR OUTSIDE PAINTS

The invention relates to an emulsified vinylic copolymer meant to be used for obtaining outside paints for masonry. The copolymer is obtained by the in-emulsion copolymerizing method and has high properties. The obtaining of the copolymer is made by copolymerizing 2,0...10,0 parts of ethyl acrylate with 18,0...36,0 parts of butyl acrylate, 0,5...2,0 parts of acrylic acid, 15,0...35,0 parts of methyl methacrylate, 20,0...38,0 parts of styrene and 2,0...15,0 parts of butyl methacrylate, in the presence of 0,5...2,0 parts of sodium dodecylsulphate as 20% aqueous solution, 7,5..11,0 parts of sodium dodecylbenzenesulphonate as 20% aqueous solution, 0,1...0,3 parts of ethoxylated nonylphenol with 10 ethylenoxide moles, 1,0...2,0 parts of ethoxylated nonylphenol with 16 ethylenoxide moles, 0,3...0,6 parts of ethoxylated nonylphenol with 30 ethylenoxide moles, 0,08...0,12 parts of tert-dodecylmercaptane, 0,3...0,6 parts of potasium persulphate, 0,2...0,4 parts of sodium bicarbonate, 90,0...100,0 parts of soft water and the final neutralization of the emulsified copolymer with 0,5...8,0 parts of ammonia as 25% aqueous solution, the parts being expressed by weight. Invenţia se referă la un copolimer vinilic emulsionat, destinat obţinerii vopselelor de exterior, pentru zidărie. Copolimerul este obţinut prin metoda polimerizării în emulsie şi prezintă proprietăţi superioare. Obţinerea copolimerului are loc prin polimerizarea a 2,0...10,0 părţi de acrilat de etil cu 18,0...36,0 părţi de acrilat de butil, 0,5...2,0 părţi de acid acrilic, 15,0...35,0 părţi de metacrilat de metil, 20,0...38,0 părţi de stiren şi 2,0...15,0 părţi de metacrilat de butil, în prezenţă de 0,5...2,0 părţi de dodecilsulfat de sodiu sub formă de soluţie apoasă 20%, 7,5...11,0 părţi de dodecilbenzensulfonat de sodiu sub formă de soluţie apoasă 20%, 0,1...0,3 părţi de nonilfenoletoxilat cu 10 moli de etilenoxid, 1,0...2,0 părţi de nonilfenoletoxilat cu 16 moli de etilenoxid, 0,3...0,6 părţi de nonilfenoletoxilat cu 30 de moli de etilenoxid, 0,08...0,12 părţi de terţ-dodecilmercaptan, 0,3...0,6 părţi de persulfat de potasiu, 0,2...0,4 părţi de bicarbonat de sodiu, 90,0...100,0 părţi de apă dedurizată, şi neutralizarea finală a copolimerului emulsionat, cu 0,5...8,0 părţi de amoniac sub formă de soluţie apoasă 25%, părţile fiind exprimate în greutate.