| abstract |
There are provided aqueous emulsions useful for rendering porous substrates water repellent comprisingn a) a hydrolyzable silane and/or siloxane, b) an organopolysiloxane resin consisting of R₃SiO 0.5 siloxane units and SiO₂ siloxane units, or R₃SiO 0.5 units, R₂SiO units, and SiO₂ siloxane units, c) a filler having a surface area of at least 40 m²/g, d) an emulsifying agent, and e) water. n Such compositions are especially useful on masonry exposed to wind-driven rain. |