Dow Corning Corporation

Dow Silicones Corporation

Timothy Roggow

Yihan Liu

Andreas Stammer

David B Selley

Paul Vandort

Marie-Jose Sarrazin

Lok Ming Li

David Selley

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.

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Saginaw, MI, United States of America

Timothy Roggow