Cleaning compositions for solid surfaces – auxiliary compositions – With oxygen – halogen – sulfur – or nitrogen containing or...
Reexamination Certificate
2001-05-01
2004-04-20
Hardee, John (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
With oxygen, halogen, sulfur, or nitrogen containing or...
C510S220000, C510S221000, C510S372000
Reexamination Certificate
active
06723687
ABSTRACT:
TECHNICAL FIELD
The present invention relates to automatic dishwashing detergent compositions comprising a diacyl peroxide bleaching agent and a blooming perfume composition containing blooming perfume ingredients and delayed blooming perfume ingredients. Preferred methods for cleaning dishware are included.
BACKGROUND OF THE INVENTION
Builders, surfactants, alkalinity, and bleaching chemicals traditionally have been used in automatic dishwashing detergent (ADD) compositions to promote soil removal from dishes, soil antiredeposition and anti-spotting benefits. However, strong alkalis like sodium hydroxide and bleaches such as hypochlorite can be damaging to, or leave a film upon, glasses, dishware or silverware. Accordingly, milder ADD compositions have been developed that make use of a source of hydrogen peroxide. Diacyl peroxide bleaching agents are particularly effective at removing stains, especially carotenoid, from plastic dishware. However, such bleaching agents have strong base odors that can be difficult to mask or cover up with perfume compositions. This is especially true in liquid, gel and paste compositions where the bleaching agents can more readily degrade or react with other ingredients in the composition and introduce off odors.
Plastic dishware also tends to pickup residual food malodors or other malodors from the dishwashing process. It is desirable to formulate perfume compositions for ADD products that can cover up or mask such malodors and give the impression that washed items, particularly plastic dishware, are fresh and clean at the end of the washing cycle when the consumer removes them from the machine. However, the perfume smell should not linger significantly or adhere noticeably to the washed items.
U.S. Pat. No. 6,143,707, Trinh et al, issued Nov. 7, 2000, discloses automatic dishwashing detergent compositions comprising blooming perfume compositions containing blooming perfume ingredients, and optionally, delayed blooming perfume ingredients, and non-blooming perfume ingredients. The compositions can also contain bleaching agents, including diacyl peroxides.
U.S. Pat. No. 5,089,162, Rapisarda et al, issued Feb. 18, 1992, discloses cleaning compositions containing bleach-stable yellow colorant and either a chlorine bleach or an oxygen bleach. The compositions may be automatic dishwashing detergents, and preferably have a lemon-like scent. Various perfume ingredients and perfume compositions are disclosed.
SUMMARY OF THE INVENTION
It has now been discovered that automatic dishwashing detergent compositions comprising a blooming perfume composition and an effective amount of a diacyl peroxide bleaching agent can be formulated to provide cleaning and stain removal (e.g., carotenoid stain removal) benefits, while also providing a positive scent signal to consumers during use.
Taken broadly, the present invention encompasses automatic dishwashing detergent compositions comprising, by weight:
(a) from about 0.01% to about 5% of a blooming perfume composition comprising from about 15% to about 60% of blooming perfume ingredients having a boiling point of less than about 260° C. and a ClogP of at least about 3, and from about 15% to about 70% of delayed blooming perfume ingredients having a boiling point of less than about 260° C. and a ClogP of less than about 3, wherein the weight ratio of blooming perfume ingredients to delayed blooming perfume ingredients is from about 0.25 to about 1.5 and said blooming perfume composition comprises at least about 40% by weight of blooming perfume ingredients and delayed blooming perfume ingredients; and
(b) an effective amount of diacyl peroxide bleaching agent.
The above blooming perfume composition provides superior perfume effects in that it masks the base odors from the diacyl peroxide bleaching agent in the composition, while providing a pleasant fragrance in the area surrounding the automatic dishwashing machine during and after use. The perfume composition covers up or masks residual food malodors and/or other malodors from the dishwashing process, including on washed items such as plastic dishware that tend to pick up such malodors. The perfume composition thus gives the impression that the washed items are fresh and clean at the end of the washing cycle when the items are removed from the machine. The ingredients of the perfume composition are also selected to minimize residual odor on washed items, particularly plastic items.
The present invention also encompasses cleaning methods; more particularly, a method of washing dishware in a domestic automatic dishwashing appliance, comprising treating soiled dishware in an automatic dishwasher with an aqueous bath comprising the composition as provided above.
All parts, percentages and ratios used herein are expressed as percent weight unless otherwise specified. All documents cited are, in relevant part, incorporated herein by reference.
DETAILED DESCRIPTION OF THE INVENTION
Automatic dishwashing compositions of the present invention comprise a blooming perfume composition and an effective amount of diacyl peroxide bleaching agent, as described in more detail below.
Amounts of the essential ingredients can vary within wide ranges, however preferred automatic dishwashing detergent compositions herein (which have a 1% aqueous solution pH of from about 2 to about 12, more preferably from about 3 to about 11) comprise from about 0.01% to about 5%, preferably from about 0.03% to about 3%, and more preferably from about 0.05% to about 2%, of a blooming perfume composition.
Preferred compositions herein are in the form of liquids, gels or pastes and contain from about 40% to about 99%, preferably from about 60% to about 99%, more preferably from about 80% to about 99%, of water. Because of the reactivity of bleaching agents in such compositions, and the potential for generation of off odors, the benefits provided by the present blooming perfume composition containing base masking perfume ingredients are generally greater in such compositions.
By “effective amount” herein is meant an amount, which is sufficient, under whatever comparative test conditions are employed, to enhance cleaning of a soiled surface. In automatic dishwashing, the soiled surface may be, for example, a plastic container with tomato stains or dishes soiled with simple starches or more complex food soils. The test conditions will vary, depending on the type of washing appliance used and the habits of the user. Of course, the performance of bleaches will be affected by such considerations, and the levels used in fully formulated detergent and cleaning compositions can be appropriately adjusted.
Blooming Perfume Composition
Blooming perfume compositions, as disclosed herein, can be formulated into automatic dishwashing detergent compositions and provide significantly better noticeability to the consumer than non-blooming perfume compositions not containing a substantial amount of blooming perfume ingredients. Additionally, residual perfume is not desirable on many surfaces, including dishes, glasses and cutlery, especially those made of plastic, rubber and silicone.
A blooming perfume ingredient is characterized by its boiling point (B.P.) and its octanol/water partition coefficient (P). The octanol/water partition coefficient of a perfume ingredient is the ratio between its equilibrium concentrations in octanol and in water. The preferred perfume ingredients of this invention have a B.P., determined at the normal, standard pressure of about 760 mm Hg, of about 260° C. or lower, preferably less than about 255° C.; and more preferably less than about 250° C., and an octanol/water partition coefficient P of about 1,000 or higher. Since the partition coefficients of the preferred perfume ingredients of this invention have high values, they are more conveniently given in the form of their logarithm to the base 10, logP. Thus the preferred perfume ingredients of this invention have logP at 25° C. of about 3 or higher.
Boiling points of many perfume compounds can be found in the following sources:
Properti
Hardee John
Hasse Donald E.
The Procter & Gamble & Company
Waugh Kevin L.
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