Penetrating stains and sealants from polyurethane dispensions

A method of applying a waterborne, penetrating composition to a porous substrate comprising applying to the surface of a porous substrate a waterborne penetrating composition which penetrates into said substrate and does not form an appreciable film on said substrate, said waterborne penetrating composition comprising:

• a) an aqueous dispersion of a polyurethane-urea having a particle size diameter of less than about 0.2 micron;
• wherein the polyurethane-urea comprises the dispersion in an aqueous media of the reaction product of:
• i) at least one diol with
• ii) at least one diisocyanate-functional material;
• wherein the reaction between i) and ii) takes place in the presence of between about 0.01% to about 0.06% by weight of a catalyst;
• wherein the ratio of i) to ii) is such that the ratio of isocyanate functionality to hydroxy functionality is in the range of between about 1.01:1 to about 1.5:1;
• wherein between about 1% and about 10% of the total polymer weight solids is contributed by diols having the ability to contribute ioinic or hydrophilic groups to the polyurethane-urea;
• wherein the reaction product of i) and ii) is at least about 80% neutralized with a weak base prior to dispersion in said aqueous media;
• and
• b) a surface tension modifying agent selected from the group consisting of the 2,2,4-trimethyl-alkyl diol monoisobutyrate solvents;
• glycols;
• glycol ethers;
• alcohols;
• and mixtures thereof in an amount effective to lower the surface tension of the composition so that the composition, when applied over a porous architectural substrate, penetrates into said substrate and does not form an appreciable film on said substrate.

A waterborne, penetrating wood stain comprising:

• a) an aqueous dispersion of a polyurethane-urea having a particle size diameter of less than about 0.2 micron;
• wherein the polyurethane-urea comprises the dispersion in an aqueous media of the reaction product of:
• i) at least one diol with
• ii) at least one diisocyanate-functional material;
• wherein the reaction between i) and ii) takes place in the presence of between about 0.01% to about 0.06% by weight of a catalyst;
• wherein the ratio of i) to ii) is such that the ratio of isocyanate functionality to hydroxy functionality is in the range of between about 1.01:1 to about 1.5:1;
• wherein between about 1% and about 10% of the total polymer weight solids is contributed by diols having the ability to contribute ionic or hydrophilic groups to the polyurethane-urea;
• wherein the reaction product of i) and ii) is at least about 80% neutralized with a weak base prior to dispersion in said aqueous media;
• b) at least one colorant;
• and
• c) a surface tension modifying agent selected from the group consisting of the 2,2,4-trimethyl-alkyl diol monoisobutyrate solvents;
• glycols;
• glycol ethers;
• alcohols;
• and mixtures thereof in an amount effective to lower the surface tension of the stain so that the stain, when applied over a wood substrate, penetrates into said substrate and does not form an appreciable film on said substrate.

A waterborne, penetrating water sealant composition comprising:

• a) an aqueous dispersion of a polyurethane-urea having a particle size diameter of less than about 0.2 micron;
• wherein the polyurethane-urea comprises the dispersion in an aqueous media of the reaction product of:
• i) at least one diol with
• ii) at least one diisocyanate-functional meterial;
• wherein the reaction between i) and ii) takes place in the presence of between about 0.01% to about 0.06% by weight of a catalyst;
• wherein the ratio of i) to ii) is such that the ratio of isocyanate functionality to hydroxy functionality is in the range of between about 1.01:1 to about 1.5:1;
• wherein between about 1% and about 10% of the total polymer weight solids is contributed by diols having the ability to contribute ionic or hydrophilic groups to the polyurethane-urea;
• wherein the reaction product of i) and ii) is at least about 80% neutralized with a weak base prior to dispersion in said aqueous media;
• b) at least one paraffin or wax;
• and
• c) a surface tension modifying agent selected from the group consisting of the 2,2,4-trimethyl-alkyl diol monoisobutyrate solvents;
• glycols;
• glycol ethers;
• alcohols;
• and mixtures thereof in an amount effective to lower the surface tension of the sealant so that the sealant, when applied over a porous architectural substrate, penetrates into said substrate and does not form an appreciable film on said substrate.