Dispersible and redispersible polymer binders are polymer powders such as vinyl acetate-ethylene copolymer and vinyl chloride-ethylene. It can be used as co-binders in cementitious dry mortars improving adhesion, flexibility, thixotropic properties, outstanding flow properties, and water repellency. Depending on class of polymer it can be with: great flowing properties, thixotropic effects, leveling effects, hydrophobic properties, neutral on rheology properties, extended open time