Aqueous systems containing silanes for rendering masonry surfaces water repellant
AssigneeSCM Corporation
InventorsRalph J. DePasquale, Michael E. Wilson
Life of this patent
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Abstract
There is provided an aqueous emulsion of (a) a hydrolyzable silane having the general formula: R.sub.n --Si--(R').sub.4-n wherein R is a hydrocarbyl group containing from 1 to 20 carbon atoms, R' is a hydrolyzable group and n is 1 or 2, and oligomers thereof, e.g., dimers and trimers, and other oligomers, (b) an emulsifying agent having an HLB value of from 4 to 15, and (c) water.
Claims15
An aqueous silane emulsion composition useful to render a porous ceramic material water repellant which consists essentially of (a) from 1% to 40% by weight of hydrolyzable silane having a molecular weight up to about 500 and the general formula:
- R.sub.n --Si--(R').sub.4-n
- wherein R is a C.sub.1 -C.sub.20 hydrocarbyl or halogenated hydrocarbyl group, R' is C.sub.1 -C.sub.3 alkoxy or halide or amino or carboxyl group, and n is 1 or 2, or oligomers thereof, (b) from 0.5 to 50% by weight of the silane component of an emulsifier having an HLB value of from 4-15, and (c) water.
A process for increasing the resistance to penetration by aqueous media of masonry which comprises applying to the surface thereof an aqueous silane emulsion which consists essentially of (a) from 1% to 40% by weight of hydrolyzable silane having a molecular weight up to about 500 and the general formula:
- R.sub.n --Si--(R').sub.4-n
- wherein R is a C.sub.1 -C.sub.20 hydrocarbyl or halogenated hydrocarbyl group, R' is C.sub.1 -C.sub.3 alkoxy, halide, amino, carboxylate, and n is 1 or 2, or oligomers thereof, (b) from 0.5 to 50% by weight of the silane component of an emulsifier having an HLB value of from 4-15, and (c) water.
Dependencies are inferred from the claim text.