Cleaning compositions for solid surfaces – auxiliary compositions – Auxiliary compositions for cleaning – or processes of preparing – Dishwasher rinse composition
Reexamination Certificate
2001-12-13
2004-02-17
Mulcahy, Peter D. (Department: 1713)
Cleaning compositions for solid surfaces, auxiliary compositions
Auxiliary compositions for cleaning, or processes of preparing
Dishwasher rinse composition
C510S521000, C510S522000, C510S524000, C510S526000, C510S531000, C510S532000, C510S533000, C524S556000, C524S706000
Reexamination Certificate
active
06693071
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to rinse aid surface coatings, compositions, methods and articles of manufacture comprising a nanoparticle system or employing the same to impart surface modifying benefits for all types of dishware surfaces in automatic dishwashing applications.
The use of non-photoactive nanoparticles allows for the creation of rinse aid surface coatings, compositions, methods and articles of manufacture that create multi-use benefits to modified dishware surfaces. These surface modifications can produce durable, protective, long lasting or semi-permanent multi-use benefits that include at least one of the following improved surface properties: wetting and sheeting, uniform drying, anti-spotting, anti-staining, anti-filming, self cleaning, and durability, relative to dishware surfaces unmodified with such nanoparticle systems.
BACKGROUND OF THE INVENTION
There have been many problems associated with developing rinse aid surface coatings for dishware that provide a beneficial layer with the desirable properties and which minimize the disadvantages, such as a limit to single use protection, insufficient coverage, roughness and/or flaking of coating during use, or in contrast, the inability to remove once applied (when a more temporary coating is desired) and a limit on surfaces that can be modified.
Current approaches to solving the coating problem includes the use of non-dispersive, film-forming polymer coatings and clay-containing, non-dispersive, film-forming polymer coatings. However, the substantivity of the non-dispersive, film-forming polymers (e.g. alkoxylated silicones, poly(N-vinyl-2-pyrrolidones, poly(N-vinyl-imidazoles, diblock copolymers of poly(ethylene oxide) and poly(lactide)) is poor such that its wetting/sheeting effect is short-lived, with spotting/residue negatives returning within 1-2 rinse cycles. Elevating the levels of non-dispersive polymers is not the solution to this problem. This is especially evident on dishware where elevated levels of polymers result in unacceptable residue or film problems. In the case of clay-containing, non-dispersive, film-forming polymer coatings, the nanoparticles are rheology agents for the formulations and do not themselves impart the benefit disclosed.
It is apparent that there is a continuing need to improve the various properties of all dishware surfaces in automatic dishwashers, including but not limited to plastics, metals, glass, wood and stone surfaces, via a dispersive coating composition and method of use which would result in dishware surfaces having one or more of the following highly desirable modified surface properties such as improved wetting and sheeting, uniform drying, anti-spotting, anti-staining, anti-filming, self cleaning, and durability. There is also a continuing need that these modified surface benefits be made the more responsive to consumer applications.
Additional background patents and patent publications, some of which disclose various uses of nanoparticles, include: U.S. Pat. Nos. 4,591,499 and 4,597,886; JP 04-353438; U.S. Pat. No. 5,429,867; JP 96053558; GB 2 303 373; U.S. Pat. No. 5,853,809; PCT WO 99/00457; WO 00/000554 A1; WO 01/27236; and WO 01/32820.
SUMMARY OF THE INVENTION
The present invention relates to rinse aid materials, coatings, compositions, methods, and articles of manufacture that provide some important dishware surface multi-use benefits that can be made durable, protective, long lasting or semi-permanent in the automatic dishwasher environment. These multi-use benefits include at least one of the following: improved wetting and sheeting, uniform drying, anti-spotting, anti-staining, anti-filming, self cleaning, and durability relative to surfaces that are not treated with the rinse aid materials, coatings, or coating compositions. The rinse aid surface coating composition of the present invention can be used in the automatic dishwashing cycle in conjunction with a general detergent or actually as a rinse aid in the rinsing or pre-drying cycle. The following are some non-limiting embodiments of the present invention.
In one embodiment of the present invention there is provided a rinse aid material for coating the dishware surfaces. As used herein, the term “coating” includes coatings that completely cover a surface, or portion thereof, as well as coatings that may only partially cover a surface, such as those coatings that after drying leave gaps in coverage on a surface. The latter category of coatings may include, but is not limited to a network of covered and uncovered portions (e.g., non-continuous covered regions of the surface). When the coatings described herein are described as being applied to a surface, it is understood that the coatings need not be applied to, or that they cover the entire surface. For instance, the coatings will be considered as being applied to a surface even if they are only applied to modify a portion of the surface.
As used herein, the term “coating” includes coatings that completely cover a surface, or portion thereof, as well as coatings that may only partially cover a surface, such as those coatings that after drying leave gaps in coverage on a surface. The latter category of coatings may include, but is not limited to a network of covered and uncovered portions (e.g., non-continuous covered regions of the surface). When the coatings described herein are described as being applied to a surface, it is understood that the coatings need not be applied to, or that they cover the entire surface. For instance, the coatings will be considered as being applied to a surface even if they are only applied to modify a portion of the surface. The rinse aid material for coating the dishware surfaces can comprise a plurality of non-photoactive nanoparticles, or it can comprise a single non-photoactive nanoparticle surface coating composition. Such a coating composition may comprise: (a) an effective amount of non-photoactive nanoparticles; (b) a dispersant polymer; (c) optionally a surfactant; Cd) optionally having associated to said nanoparticle surface a quantity of one or more functionalized surface molecules exhibiting properties selected from the group consisting of hydrophilic, hydrophobic and mixtures thereof; (e) optionally one or more adjunct ingredients; and (f) optionally a suitable carrier medium.
In another embodiment of the present invention, there is provided a method of applying a substantially clear coating to a dishware surface during the rinse cycle of an automatic dishwashing appliance comprising: applying a material comprising an effective amount of non-photoactive nanoparticles to the dishware surface; and, actively curing the material to form a coating on the dishware surface.
In another embodiment of the present invention, there may be provided a rinse aid surface coating composition for coating the dishware surfaces comprising (a) an effective amount of non-photoactive nanoparticles; (b) a dispersant polymer selected from the group consisting of polyacrylic acid, poly (acrylic/allyl alcohol), poly (acrylic/maleic), polycarboxylic acids, sodium tripolyphosphate, pyrophosphate, and mixtures thereof; (c) optionally a surfactant; (d) optionally having associated to said nanoparticle surface a quantity of one or more functionalized surface molecules exhibiting properties selected from the group consisting of hydrophilic, hydrophobic and mixtures thereof; (e) optionally one or more adjunct ingredients; and (f) optionally a suitable carrier medium.
In another embodiment of the present invention, there may be provided a rinse aid surface coating composition for coating the dishware surfaces comprising (a) an effective amount of non-photoactive nanoparticles wherein the non-phocoactive nanoparticles are selected from the group consisting of LAPONITE RD™ and LAPONITE BT™, and mixtures thereof; (b) a dispersant polymer selected from the group consisting of polyacrylic acid, poly (acrylic/allyl alcohol), poly (acrylic/maleic), polycarboxylic adds, sodium tripolyphosphate, pyrophosphate, and mixtures th
Carter John David
Ghosh Chanchal Kumar
Gosselink Eugene Paul
McDonald Michael Ray
Rohrbaugh Robert Henry
Mulcahy Peter D.
Sastri Satya
The Procter & Gamble & Company
Waugh Kevin L.
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