Dow Corning Corporation

Dow Corning Australia Pty Ltd

Dow Silicones Corporation

Marie-Jose Sarrazin

Andreas Stammer

David B Selley

Yihan Liu

Paul Vandort

Lok Ming Li

Timothy Roggow

Jean-Paul H Lecomte

Brett Lee Zimmerman

Leon Andre Marteaux

Fabrizio Galeone

Laurence Gallez

Marc Thibaut

Frederick Campeol

Anthony S McAuliffe

David Selley

Jean-Paul Lecomte

David Brian Selley

Anthony S Mcauliffe

Leon Marteaux

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.

Water repellent organosilicon materials

The invention relates to a process for preparing a cyclic siloxane copolymer, a water repellent composition and the use for treating porous substrates like concrete, especially reinforced concrete.

Process of preparing a siloxane copolymer

The invention provides a water repellent composition for treating porous substrates comprising an emulsion which includes water, at least one surfactant, and a siloxane copolymer having the formula (I) wherein R is an alkyl radical having 1 to 3 carbon atoms; a has a value of from 1 to 12; R' is an alkyl radical having 8 to 12 carbon atoms, b&#x2267;2; (a+b) is at least 5. This composition shows a good depth of penetration of porous substrates especially reinforced concrete and has a low Volatile Organic Content to ASTM D 5095. 

Water repellent for concrete

A process for preparing a cyclic siloxane copolymer, a water repellent composition and the use for treating porous substrates like concrete, especially reinforced concrete.

The present invention relates to hydrophobic gypsum and to a process for making gypsum hydrophobic, in particular it relates to a powdered hydrophobing additive, a hydrophobic gypsum composition and method for preparing same using granules containing organosilicon compounds as hydrophobing additives. The invention provides a granulated additive for rendering gypsum material hydrophobic, comprising a particulate carrier on which is deposited an organosilicon component, a binder polymer and an emulsifier for the organosilicon component. Such a granulated hydrophobic additive is able to provide a high initial hydrophobicity to gypsum materials to which it is applied and that the obtained hydrophobicity can last during a long period of time.

Gypsum materials

Aqueous silicone emulsions are disclosed containing a phenyl silsesquioxane resin, an alkoxysilane, a hydroxy terminated polydialkylsiloxane, and an emulsion of an aminofunctional polysiloxane. The silicone emulsions are useful for imparting water repellency to various surfaces, and in particular, inorganic building surfaces.

Aqueous silicone emulsion for imparting water repellency

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Brussels, Belgium

Marie-Jose Sarrazin