Abstract: The present disclosure provides for an aqueous coating composition to coat and form a film on porous construction materials to help in controlling efflorescence in the porous construction materials. The aqueous coating composition includes a binder having an acrylic polymer in an acrylic polymer waterborne dispersion, wherein the acrylic polymer has a glass transition temperature (Tg) of 1° C. to 60° C.; and an alkoxy silane coalescing agent in a waterborne silane coalescing emulsion. The aqueous coating composition optionally further includes an additive selected from the group consisting of a pigment, a filler and combinations thereof. In one embodiment, the alkoxy silane coalescing agent provides the only coalescing agent for the acrylic polymer waterborne dispersion in the aqueous coating composition.

Abstract: A method for preparing an elastomeric silicone powder comprises the steps of: (i) forming a mixture of organopolysiloxane A and organopolysiloxane B, wherein organopolysiloxane A comprises more than 0.5% alkenyl groups by weight of the organopolysiloxane A, organopolysiloxane B comprises from 0.25% to 1% silicon-bonded hydrogen atoms by weight of the organopolysiloxane B; and (ii) spray curing the mixture of step (i) to form an elastomeric silicone powder.

Abstract: A process for increasing the hydrophobicity of a porous product by treating the product or a composition providing the product, with a water repellent material, characterised in that the porous product or a composition providing the product is treated with an aqueous suspension of microcapsules, where the microcapsules comprise a water repellent organopolysiloxane core material and a shell of a silicon-based network polymer comprising silica units.