Buffered silane emulsions for rendering porous substrates water repellent
AssigneePCR, Inc.
InventorMichael E. Wilson
Life of this patent
Estimating the term…
Abstract
There are provided aqueous emulsions useful for rendering porous substrates water repellent comprising (a) a hydrolyzable silane having a determinable pH-stable range, (b) an emulsifying agent having an HLB value of from 2 to 20, an effective amount of (c) a buffering compound to maintain the composition within the pH-stable range; and (d) water. Such buffered compositions are stable on long term storage and maintain high effective levels of active silane content even when they include biocides which may accelerate the hydrolysis of aqueous silane-containing compositions.
Claims45
A buffered aqueous silane emulsion composition comprising:
- effective amounts of
- (a) a hydrolyzable silane essentially hydrolytically stable within a determinable pH range;
- (b) an emulsifier or mixture of emulsifiers having an HLB value of from about 1.5 to about 20;
- (c) at least one compound for buffering the pH of said composition within said determinable pH stable range;
- and
- (d) water.
A process for increasing the resistance to penetration by aqueous media of a porous substrate, said process comprising:
- (i) applying to the surface of said substrate a buffered aqueous silane emulsion composition comprising effective amounts of
- (a) a hydrolyzable silane essentially hydrolytically stable within a determinable pH range;
- (b) an emulsifier or mixture of emulsifiers having an HLB value of from about 1.5 to about 20;
- (c) at least one compound for buffering the pH of said composition within said determinable pH stable range;
- and
- (d) water;
- and
- (ii) allowing said composition to cure.
A buffered aqueous silane emulsion composition comprising:
- effective amounts of
- (a) a hydrolyzable silane essentially hydrolytically stable within a determinable pH range, wherein said hydrolyzable silane has a molecular weight of up to about 600 and comprises a compound of the general formula
- R.sub.n --Si--(R.sup.1).sub.4-n
- wherein R comprises a C.sub.4 -C.sub.10 alkyl group, R.sup.1 is C.sub.1 -C.sub.6 alkoxy, halide, amino, carboxyl or a mixture of any of the foregoing and n is 1 or 2, or an oligomer of said compound;
- (b) an emulsifier or mixture of emulsifiers having an HLB value of from about 1.5 to about 20;
- (c) at least one compound for buffering the pH of said composition within said determinable pH stable range;
- and
- (d) water.
A buffered aqueous silane emulsion composition comprising:
- effective amounts of
- (a) a hydrolyzable silane essentially hydrolytically stable within a determinable pH range, said silane consisting of octyltriethoxysilane;
- (b) an emulsifier or mixture of emulsifiers having a HLB value of from about 1.5 to about 20;
- (c) at least one compound for buffering the pH of said composition within said determinable pH stable range;
- and
- (d) water.
A process for increasing the resistance to penetration by aqueous media of a porous substrate, said process comprising:
- (i) applying to the surface of said substrate a buffered aqueous silane emulsion composition comprising effective amounts of:
- (a) a hydrolyzable silane essentially hydrolytically stable within a determinable pH range;
- wherein said silane has a molecular weight of up to about 600 and comprises a compound of the general formula
- R.sub.n --Si--(R.sup.1).sub.4-n
- wherein R comprises a C.sub.4 -C.sub.10 alkyl group, R.sup.1 is a C.sub.1 -C.sub.6 alkoxy, halide, amino, carboxyl or a mixture of any of the foregoing and n is 1 or 2, or an oligomer of said compound;
- (b) an emulsifier or a mixture of emulsifiers having an HLB value of from about 1.5 to about 20;
- (c) at least one compound for buffering the pH of said composition within said determinable pH range;
- and
- (d) water.
A process for increasing the resistance to penetration by aqueous media of a porous substrate, said process comprising:
- (i) applying to the surface of said substrate a buffered aqueous silane emulsion composition comprising effective amounts of:
- (a) a hydrolyzable silane essentially hydrolytically stable within a determinable pH range, said silane consisting of octyltriethoxysilane;
- ( b) an emulsifier or a mixture of emulsifiers having an HLB value of from about 1.5 to about 20;
- (c) of at least one compound for buffering the pH of said composition within said determinable pH range;
- and
- (d) water.
Dependencies are inferred from the claim text.