Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-09-17
2003-05-20
DelCotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S127000, C510S137000, C510S138000, C510S158000, C510S159000, C510S467000, C510S501000
Reexamination Certificate
active
06566313
ABSTRACT:
FIELD OF INVENTION
The present invention relates to a shampoo and/or body wash composition and to a method of use thereof. The shampoo or body wash composition is preferably used to both cleanse and condition skin and/or hair treated with the composition. The composition of the present invention contains a conditioning complex that is compatible with anionic surfactants and is substantive to skin and/or hair.
BACKGROUND OF THE INVENTION
Shampoos for cleansing the hair, and body wash compositions for cleaning the skin are commonly formulated with anionic surfactants that produce copious amounts of foam and clean the hair and skin of excess sebum and dirt. However, the anionic surfactants also remove the natural protective oils from the skin and hair, leaving the skin and hair dry and/or rough. Typically, a subsequent separate treatment with a conditioning composition is needed to return the skin and hair to an aesthetically desired state. Investigators have sought to develop shampoo and body wash compositions that both cleanse the skin and hair, and leave the skin and hair soft and moisturized.
For example, much research has been directed to the use of cationic fatty quaternary compounds and/or silicone based compounds as conditioning compounds in shampoos and body wash compositions. Many patents have been issued in this area, including U.S. Pat. Nos. 4,741,855; 5,456,863; 3,990,991; and 5,683,683. Some drawbacks of these compositions include lack of stability, the appearance which is usually opaque, and the rheology which tends to be viscous. Another disadvantage is that these compositions tend to have poor rinseablity from the skin and hair, leading to a greasy, coated feel to the hair or skin.
U.S. Pat. No. 5,945,093 to Duvel discloses a conditioning shampoo composition containing an anionic surfactant, a cationic surfactant, a silicone conditioning agent and a polymeric suspending agent. The cationic surfactant is preferably an acid neutralized amidoamine, that is also disclosed as providing some conditioning properties. A disadvantage of this formulation is that when the amidoamine is neutralized with the acids disclosed therein, the resultant quaternary salt is not substantive to skin and hair, and is easily rinsed, leaving little or no residual softness and/or smoothness.
The present invention provides a shampoo and/or body wash composition which contains a conditioning complex that is strongly substantive to the skin and hair, and does not leave a greasy feel to the skin or hair. The composition can also preferably be formulated to be visually transparent. The conditioning complex also permits the composition to be formulated to the intrinsic pH of healthy skin and hair, which provides the treated skin and hair with a cosmetically desirable smooth, soft and moisturized feel.
SUMMARY OF THE INVENTION
The present invention relates to a shampoo or body wash composition that can be used to both clean and condition the skin or hair. The composition contains from about 1 weight percent to about 40 weight percent, based on the total weight of the composition of at least one anionic surfactant; a conditioning complex, and at least about 40 weight percent of water. The conditioning complex is formed from at least
(i) about 0.01 weight percent to about 4 weight percent, based on the total weight of the composition, of at least one alkyl amidoamine where at least one of the substituents of the tertiary amine is R
1
CONHR
2
—, where R
1
is an alkyl group having from about 9 to about 21 carbon atoms, and R
2
is an alkylene group having from 1 to about 8 carbon atoms; and
(ii) at least one phosphate ester having a formula II
where R
6
is an alkylene group having from about 2 to about 4 carbon atoms, R
7
is an alkyl group having from about 8 to about 22 carbon atoms, n is a number ranging from 1 to about 30, R
8
is hydrogen, an R
7
(OR
6
)
n
— group, an alkyl group having from 1 to about 5 carbon atoms, a hydroxyalkyl group having from 1 to about 5 carbon atoms, an alkali metal, alkaline earth metal, diethanolamine, or ammonium group, and where the amount of phosphate ester added to the composition is such that a solution consisting of water, the alkyl amidoamine in the amount used in the shampoo or body wash composition, and the phosphate ester in the amount used in the shampoo or body wash composition, results in an aqueous pH ranging from about 4 to about 6. The composition has a pH of from about 4 to about 6.
The present invention also provides a method of treating skin or hair comprising contacting the skin or hair with the composition of the present invention.
The present invention is also directed to a water-dispersible conditioning complex formed by the steps that include combining the alkyl amidoamine of (i) and the phosphate ester of (ii) to form a mixture, where the molar ratio of the phosphate ester to the alkyl amidoamine ranges from about (1:1) to about (3:1).
DETAILED DESCRIPTION OF THE INVENTION
The shampoo or body wash composition of the present invention cleans the skin and/or hair, while also having conditioning properties. By “shampoo or body wash composition” it is meant any composition useful for cleaning the skin and/or hair. By “cleaning” it is meant removing substances such as dirt and sebum from hair and/or skin. By “conditioning” it is meant that skin treated with the composition is preferably smooth, moisturized, and/or soft, and hair treated with the composition is preferably soft, smooth, and/or free of tangles.
The composition of the present invention contains a special conditioning complex and an anionic surfactant. The conditioning complex surprisingly enhances the quantity and/or quality of foam produced by the anionic surfactant, while also providing conditioning benefit to the skin or hair. Other benefits of the composition of the present invention include reduced irritation due to excessive defatting of the skin and scalp. The composition may also, if desired, be formulated as a transparent formulation, semi-transparent, or opaque formulation.
The conditioning complex of the present invention is preferably water dispersible and is formed from at least a tertiary alkyl amidoamine and a phosphate ester. By “water-dispersible” it is meant that the conditioning complex is dispersible in the shampoo or body wash composition of the present invention, but preferably not dissolved in water. By “formed from at least”, it is meant that at least the alkyl amidoamine and the phosphate ester are combined to form the conditioning complex. One skilled in the art will recognize that it is possible that other optional compounds such as water are present when the conditioning complex is formed.
Although not intending to be bound by theory, tertiary alkyl amidoamines are strongly alkaline materials that are generally neutralized with acids to form cationic conditioning compounds useful in rinse-off hair conditioners. For example, when tertiary alkyl amidoamines are neutralized with water-soluble acids, such as citric acid, the alkyl amidoamine becomes a water-soluble cationic quaternary conditioner. These conditioners although having good substantivity to the hair or skin, are not deposited on the hair and skin in a sufficient amount, resulting in a feeling of softness, but no perceptible emollience (i.e., smoothness). When the tertiary alkyl amidoamine is neutralized with a high molecular weight fatty acid, such as stearic acid, the alkyl amidoamine becomes an oil-soluble cationic quaternary emulsifier, having good substantivity to the skin or hair, but very poor rinseability. This results in the hair feeling heavy and/or greasy and the skin feeling greasy and or coated after treatment with this compound. The present inventors have discovered that certain phosphate esters can be used to neutralize tertiary alkyl amidoamines to form a cationic conditioning complex that has good substantivity to hair and skin, can be deposited on the hair and skin in an adequate amount, and can also be adequately rinsed from the skin or hair, leaving hair soft and manageable an
Andrassy George
Hohenstein Karen A.
DelCotto Gregory
Harper Stepthen D.
Henkel Corporation
Hil Gregory M.
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