Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2001-05-11
2003-12-09
Page, Thurman K. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S073000, C424S078030, C424S400000, C514S945000
Reexamination Certificate
active
06660282
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a foaming cosmetic product based upon a cosmetic composition delivered through a non-aerosol dispenser, wherein the dispenser cooperates with the cosmetic composition to generate a mousse quality foam while concurrently imparting moisturization benefits to the skin.
2. The Related Art
Cosmetic compositions in mousse form have certain appeal to consumers. Foremost is the instant foam achieved by the mere press of a button. Aerosol dispensers employing propellants generally provide a satisfactory foam volume. Unfortunately, aerosol products are under attack for environmental reasons. Volatile organics interfere with the earth's ozone layer and contribute to smog in metropolitan areas. Aerosol packages are also relatively costly to assemble. For all these reasons, attention has been recently directed at non-aerosol dispensers.
U.S. Pat. No. 5,635,469 (Fowler et al.) discloses personal cleansing products comprising a foamable liquid composition and a foam-producing non-aerosol dispenser. The compositions include a surfactant, a water soluble cationic or nonionic polymer, a humectant, a water-insoluble emollient and water. The dispenser employs at least two screens through which the composition is blown to generate a foam.
U.S. Pat. No. 5,364,031 (Taniguchi et al.) discloses a foam dispensing system having nozzles including a velocity decreasing structure. The average foam velocity through these structures is controlled to avoid exceeding a given value. Examples are provided of suitable cosmetic products for use with these systems.
U.S. Pat. No. 6,030,931 (Vinski et al.) describes a non-aerosol pump foaming composition free of water insoluble emollients. Transparent systems achieve a luxurious foam generated through use of select amphoteric surfactants and densifying agents.
Delivery of the cosmetic compositions via non-aerosol dispensers has presented many challenges. Additives within these compositions can interfere with foam properties. Certain types of non-aerosol dispensers which operate with porous filters or meshed screens are not tolerant to particulate components or to even modestly viscous compositions.
For aesthetic and marketing reasons, formulators desire to impart a milky visual effect to the compositions. Milkiness is most often accomplished with titanium dioxide, mica or esters such as glycol distearate. The problem with these ingredients is that the inorganic substances generally clog screens which are necessary for generating the foaming effect. Higher molecular weight esters impart too much viscosity to be foamed by dual screen mousse generators.
Other problems with non-aerosol generated foams is that they often lack a dense luxurious character and often do not provide a cushioned afterfeel.
Accordingly, it is an object of the present invention to provide a cosmetic product in mousse form based on a milky formulation.
Another object of the present invention is to provide a cosmetic product in mousse form which is not subject to clogging within the dispensing mechanism.
Still another object of the present invention is to provide a cosmetic product in mousse form having a relatively low viscosity to achieve pumpability yet displaying an excellent cushioned afterfeel.
These and other objects of the present will become more readily apparent from consideration of the summary and detailed description which follows.
SUMMARY OF THE INVENTION
A foaming cosmetic product is provided which includes:
(A) a non-aerosol dispenser having:
(i) a container for storing a cleansing composition;
(ii) a dispensing head located on the container having a housing surrounding a pump mechanism and a foam-forming screen material;
(iii) a diptube communicating between the container and head functioning to fluidly deliver liquid cleansing composition between container and head and being upstream from the screen material; and
(B) the cosmetic composition including:
(i) from about 0.01 to about 10% by weight of the cosmetic composition of a latex suspending from about 0.1% to about 90% by weight of the latex of a polymer insoluble in the composition; and
(ii) from about 0.1 to about 10% by weight of at least one anionic surfactant.
DETAILED DESCRIPTION OF THE INVENTION
Now it has been discovered that a creamy appearance can be imparted to the composition by means of a latex. Particles of polymers forming the latex were found not to clog screens of the dispenser nor to inhibit mousse formation or interfere with skin aesthetics of the product foam.
By the term “latex” is meant water or a fluid of essentially equivalent viscosity, suspending a water-insoluble polymer. Amounts of the latex may be present from about 0.01 to about 10%, preferably from about 0.1 to about 5%, optimally from about 0.5 to about 2% by weight of the cosmetic composition. Amount of the water-insoluble polymer may range from about 0.01 to about 90%, preferably from about 0.1 to about 60%, optimally from about 10 to about 50% by weight of the latex.
Average diameters of the dispersed polymer may range from about 0.001 micron to about 120 micron, preferably from about 0.01 micron to about 1 micron, optimally from about 0.1 micron to about 0.5 micron.
Polymers of the latex include the sub categories of homo and copolymer. Moreover, the term “copolymer” includes polymers fashioned from 2 to 6 different monomers in block or random linkage.
Illustrative of copolymers suitable for the latex emulsion are those formed from styrene, alpha-methylstyrene, divinylbenzene, acrylic acid, methacrylic acid, C
1
-C
20
esters of acrylic acid or methacrylic acid, acrylamide, methacrylamide, maleic acid, vinyl acetate, crotonic acid, vinyl neodecanoate and butenoic acid. Exemplative of carboxylate type copolymers are the styrene/alkyl acrylate and partially esterified polyacrylic and polymethacrylic salts and free acid forms. Among the foregoing materials are poly(butyl methacrylate), poly(methyl acrylate), poly(methyl methacrylate), poly(acrylic acid/C
1
-C
20
alkyl acrylate) and poly(methacrylic acid/C
1
-C
20
alkyl methacrylate). These copolymers may be prepared by polymerization of the respective monomers by traditional oil-in-water or water-in-oil emulsion polymerization techniques. Alternatively, a pseudo latex may be prepared by esterification of preformed polymer with C
1
-C
20
alkanol.
A variety of techniques well-known in the art can be used to prepare latexes of water-insoluble polymer particles. These include batch, semi-continuous and seeded emulsion polymerization. See the Encyclopedia of Polymer Science and Engineering, Volume 6,1990.
Particularly preferred polymers for the present invention are styrene/acrylate latexes available from the Rohm & Haas Company sold under the trademark Acusol. The latexes are characterized by pH of about 2 to about 3, having approximately 40% solids in water, with particle size of about 0.1 to about 0.5 micron. Specific Acusol® polymers include Acusol® OP301 (styrene/acrylate) polymer, Acusol® OP302 (Styrene/Acrylate/Divinylbenzene Copolymer), Acusol® OP303 (Styrene/Acrylamide Copolymer), Acusol® OP305 (Styrene/PEG-10 Maleate/Nonoxynol-10 Maleate/Acrylate Copolymer) and (Styrene/Acrylate/PEG-10 Dimaleate Copolymer).
Number average molecular weight for polymers according to the present invention may range from about 1,000 to about 1,000,000, preferably from about 2,000 to about 500,000, optimally from about 5,000 to about 20,000.
A further component of cosmetic compositions according to the present invention is that of an anionic surfactant. Illustrative but not limiting examples include the following classes:
(1) Alkyl benzene sulfonates in which the alkyl group contains from 9 to 15 carbon atoms, preferably 11 to 14 carbon atoms in straight chain or branched chain configuration. Especially preferred is a linear alkyl benzene sulfonate containing about 12 carbon atoms in the alkyl chain.
(2) Alkyl sulfates obtained by sulfating an alcohol having 8 to 22 carbon atoms, preferably 12 to 16 carbon atoms. The alkyl sulf
Cheney Michael Charles
Crotty Brian Andrew
Slavtcheff Craig Stephen
Honig Milton L.
Lamm Marina
Page Thurman K.
Unilever Home & Personal Care USA , division of Conopco, Inc.
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