Water Repellent For Concrete
AssigneeDow Corning Corporation
InventorsLok Ming Li, Yihan Liu, Timothy Roggow, Marie-Jose Sarrazin, David Selley, Andreas Stammer, Paul Vandort
Life of this patent
Estimating the term…
Abstract
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≧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.
Claims20
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
- 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 6 to 12 carbon atoms, b≧2;
- (a+b) is at least 5 and being substantially free of alkenes.
A process of preparing an emulsion by
- 1) combining
- i) water,
- ii) a siloxane copolymer having a formula
- 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 6 to 12 carbon atoms;
- b has a value of at least 2;
- (a+b) is at least 5, and
- iii) a surfactant;
- 2) homogenizing the combined components to form an emulsion;
- and
- 3) optionally, admixing additional water and additional ingredient(s).
Dependencies are inferred from the claim text.