Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2002-09-11
2004-07-06
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S139000, C510S159000, C510S426000, C510S508000
Reexamination Certificate
active
06759376
ABSTRACT:
FIELD OF THE INVENTION
The present application relates to oil-containing personal wash, liquid compositions or emulsions, preferably, cleansing, wash-off liquid compositions or emulsions comprising particles having high refractive index (e.g., external surface having refractive index ≧1.6) and defined thickness, geometry and size (e.g., hydrophobically modified mica particles meeting defined parameters). Said particles are delivered, for example, as particle-in-oil liquid emulsion compositions. The particles enhance the shine of skin or other substrate on which they are deposited and reduce the appearance of flaws or defects on the substrate (e.g., skin).
In a second embodiment, the application relates to a method of enhancing skin shine and/or reducing flaws in the appearance of the skin using oil-containing personal wash liquid compositions or emulsions comprising particles as noted above.
BACKGROUND
One of the attributes desired by consumers is shiny, healthy-looking skin. Traditionally, skin “shine” has been achieved by depositions of oils onto substrates (e.g., skin surface). To applicants knowledge, use of specific particles of the invention in oil-containing, rinse-off personal wash liquid compositions (e.g., to enhance shine) is not known. This may be due in part to the inability (prior to subject invention) to deliver such particles in such wash-off, liquid compositions.
The use of particles generally (e.g., mica with green interference color) in personal care compositions is not novel. Thus, for example, International Publication WO 00/51551 (assigned to Procter & Gamble) describes leave-on skin care compositions containing coated mica with green interference color. As indicated the compositions are topical leave-on compositions (see abstract) designed for hand and body rather than liquid compositions of the present invention.
The particles in the WO '551 reference are used as interference particles, not to enhance shine. They have a TiO
2
layer thickness in a range of from about 150 nm to about 250 nm (column 6, line 23); this is far smaller than the upper range of thickness claimed for the shine-enhancing particles of the invention (thickness greater than 0.5 microns or 500 nanometers; and greater than the lower range of thickness claimed (thickness of less than or equal to 0.1 micron or 100 nanometers).
Also, the particles of the invention must have a flat, plate-like geometry to ensure shine enhancement. Most critically, perhaps, the reference fails to teach or suggest that the particles must be used in oil-containing, rinse-off, liquid compositions.
Particles having a thickness within the preferred range are also known (Timron® particles) but these particles have also not been used in oil-containing, liquid, personal wash, rinse-off compositions. Further, they have not been hydrophobically modified as is required for particles of the subject invention (i.e., when used in liquids).
Timron® particles sold by EM Industries, for example, are disclosed in a brochure but, as noted, there is no teaching or suggestion in the brochure or any other art that the Timron® product can be used in oil-containing personal wash, liquid, rinse-off compositions to enhance shine. That is, there is simply no disclosure of such particles in oil-containing bars, or in particle-in-oil emulsions used as personal wash compositions.
In summary, pigments used in WO '551 do not recognize the preferred particle thickness or criticality of refractive index; and, where particles of same thickness as those of the invention are known (Timron® products), there is no teaching or suggestion of using these in oil-containing, personal wash, liquid, rinse-off compositions (e.g., to enhance shine).
Unexpectedly, applicants have now found that rinse-off personal wash, liquid compositions (preferably, but not necessarily, surfactant-containing) comprising flat, plate-like particles which particles (outer surface of particles) have a defined refractive index, a preferred thickness and maximum length, and wherein said particles are delivered in compositions/emulsions comprising at least 0.01% to 75% oil provide superior shine compared, for example, to compositions having particles which are delivered in non oil-containing compositions. Further, the particle of the invention must also be hydrophobically modified. While not wishing to be bound by theory, this is believed to help the particle suspend better in oil (e.g., particle suspended in a particle-in-oil emulsion and delivered as an emollient) and be more readily delivered to substrate from the liquid compositions of the invention.
BRIEF SUMMARY OF THE INVENTION
More specifically, the present invention comprises a rinse-off, personal wash, liquid composition comprising:
(1) 0% to 75%, preferably 3% to 65% by weight composition of surfactant;
(2) 0.01% to 20%, preferably 0.02 to 10% by wt. of a particle defined by:
(a) having an exterior surface which has a refractive index of ≧1.6;
(b) having a flat, plate-like geometry;
(c) having a length of particle less than 150 microns; and
(d) having 0.001% to 5%, preferably 0.0015 to 4% by wt. particle of a hydrophobic modifying agent; and
(3) 0.1% to 75%, preferably 0.5% to 25% by wt., even more preferably 1% to 15% by wt. of a benefit agent or emollient.
In a preferred embodiment, the particle (2) has a thickness of particle (whether hydrophobically modified or not) of greater than or equal to 0.5 microns or less than or equal to 0.1 microns;
In another embodiment, the invention comprises a method of enhancing shine of skin or other substrate using any of the compositions noted above.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to compositions for and methods for enhancing shine of skin or other substrate.
More specifically, applicants have found that oil-containing, rinse-off, personal wash, liquid compositions comprising specified platelet-like particles delivered as particle-in-oil liquid emulsions unexpectedly significantly enhance shine as defined by a shine measurement test disclosed herein.
The novel personal wash, liquid compositions of the invention are rinse-off compositions. While not wishing to be bound by theory, it is believed the required oil (e.g., emollient/benefit agent) helps deliver the particles which normally might be expected to readily wash off (providing no shine benefit) from such compositions.
The compositions of the invention comprise:
(1) 0% to 75%, preferably 3% to 65% by wt. of a surfactant or surfactants selected from the group consisting of anionic, nonionic;
(2) 0.01% to 20%, preferably 0.02 to 10% by wt. of particle, wherein the particles are defined by the following characteristics:
(a) having an exterior surface which has a refractive index greater than or equal to 1.6;
(b) having flat, plate-like geometry;
(c) having a particle length less than 150 microns; and
(d) having 0.001% to 5%, preferably 0.0015% to 4% by wt. particle of a hydrophobic modifying agent; and
(3) 0.1% to 75% by wt., preferably 0.5 to 25% by wt. of composition of a benefit agent or emollient.
In a preferred embodiment, particle (2) has a particle thickness (whether or not hydrophobically modified) of greater than or equal to 0.5 microns and less than or equal to 0.1 microns.
Finally, the invention also relates to method of enhancing shine using any of these compositions.
Compositions of the invention are described in greater detail below.
The compositions of the invention are “rinse-off compositions by which is meant that they are intended to be water or rinse-off substrate after applications in contrast to leave-on lotions or cosmetics. The rinse-off compositions are applied as liquid, such as in personal wash liquids.
Surfactants
The compositions of the invention may comprise 0% to 75%, preferably 3% to 65% of a surfactant selected from the group consisting of anionic, nonionic, amphoteric/zwitterionic, cationic surfactant and mixtures thereof.
Among suitable anionic actives which may be used are the alkyl ether sulfates, acyl isethionates, alkyl ether sulfonate
Chin Jennifer
Shah Pravin
Zhang Xiaodong
Koatz Ronald A.
Ogden Necholus
Unilever Home & Personal Care USA , division of Conopco, Inc.
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