The invention relates to a process for hydrophobization of concrete or mortar using an alkylketene dimer dispersion and to the concrete or mortar obtainable by the process of the invention. The process allows to achieve effective mass and surface hydrophobization of concrete.

The present invention relates to a method for producing a gypsum-containing foamed prefabricated building material and to a gypsum-containing foamed prefabricated building material.

The present invention relates to a coating composition and method of manufacturing said coating composition. The coating composition is a two-component coating composition for construction surfaces. The present coating composition is effectively bonded to the surface without an additional application of intermediate layer overcoming the existing problems associated with conventional concrete surface treatment methods.

Process for the production of a hydrophobic thermal-insulation moulding, where a hydrophilic thermal-insulation moulding is brought into contact with a hydrophobizing agent in vapour form with formation of a thermal-insulation moulding coated with hydrophobizing agent, and this is then subjected to a press process and during the press process and/or after the press process is reacted with the hydrophobizing agent with formation of the hydrophobic thermal-insulation moulding, where a) the density of the hydrophobic thermal-insulation moulding after the press process and after the reaction with the hydrophobizing agent is from 100 to 250 kg/m.sup.3, and b) the density of the hydrophilic thermal-insulation moulding on contact with the hydrophobizing agent is from 50% to less than 100% of the density of the hydrophobic thermal-insulation moulding.

Disclosed herein are fire resistant compositions and articles, for example, in the form of boards, insulation, sheeting, blocks, panels and similar materials of construction. Also disclosed are methods of preparing fire resistant compositions and articles and methods of use thereof.

The present invention provides two-component compositions comprising a component A) one or more acrylic aqueous emulsion copolymer having a measured glass transition temperature (T.sub.g) of from −20 to 0° C. and which is the copolymerization product of (i) from 60 to 89.9 wt. % of one or more nonionic (meth)acrylic monomers, (ii) from 10 to 40 wt. % of one or more vinyl aromatic monomers, (iii) from 0.1 to 2.0 wt. % of one or more monomers chosen from itaconic acid, methacrylic acid, amides of a,β-unsaturated C.sub.3 to C.sub.6 carboxylic acids, and mixtures thereof, all wt. %s of monomers based on the total monomer solids, wherein the aqueous emulsion copolymer has at least one residue of an ascorbic acid reducing agent or is the copolymerization product of a monomer (iii) comprising itaconic acid, and, a separate component B) comprising a fast curing dry mix powder composition of a hydraulic cement and a high alumina content cement.

Provided are highly water-resistant, flexible cementitious coating compositions comprising: an aqueous styrene-butadiene latex, one or more epoxy silane, cement, and one or more solid filler. The epoxy silane may comprise one or more epoxy functional groups and one or more hydrolysable functional groups selected from siloxy, silane, and, silanol or combinations thereof. Also provided are kits comprising the components of the cementitious coating compositions, methods for providing coatings, layers or membranes derived from such wet compositions, as well as the coatings, layers or membranes derived therefrom.

A process for increasing the hydrophobicity of a porous product by treating the product, or a composition providing for the product, with a water repellent material, characterized 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 organosilicon core material selected from an organosilane, a partially condensed organosilane and a branched siloxane resin, and a shell of a silicon-based network polymer comprising silica units.

A waterproofed gypsum board and associated method are provided, featuring the use of a mixture of magnesium oxide and a gypsum crystal modifier for improving the resistance to sagging of the waterproofed gypsum board, in particular, in moist and warm climatic conditions.

A magnesium oxychloride cement (MOC) incorporating an emulsion of active cationic organo-silane and method of making same.