Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-07-24
2004-03-02
Boyer, Charles (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S131000, C510S136000, C510S137000
Reexamination Certificate
active
06699824
ABSTRACT:
TECHNICAL FIELD
The present invention relates to cleansing compositions. In particular it relates to mild personal cleansing compositions which display improved deposition of skin care actives such as antimicrobials, sunscreens and vitamins. In addition, the compositions herein display improved rinse feel in combination with good skin feel attributes, and foaming properties which are suitable for simultaneously cleansing and conditioning the skin and/or the hair and which may be used, for example, in the form of foam bath preparations, shower products, skin cleansers, hand, face and body cleansers, shampoos, etc.
BACKGROUND OF THE INVENTION
Mild cosmetic compositions must satisfy a number of criteria including cleansing power, foaming properties and mildness/low irritancy/good feel with respect to the skin, hair and the ocular mucosae. Skin is made up of several layers of cells which coat and protect the underlying tissue. The keratin and collagen fibrous proteins that form the skeleton of its structure. The outermost of these layers is referred to as the stratum corneum. Hair similarly has a protective outer coating enclosing the hair fibre which is called the cuticle. Anionic surfactants can penetrate the stratum corneum membrane and the cuticle and, by delipidization destroy membrane integrity and loss of barrier and water retention functions.
This interference with skin and hair protective membranes can lead to a rough skin feel and eye irritation and may eventually permit the surfactant to trigger immune response creating irritation.
Ideal cosmetic cleansers should cleanse the skin or hair gently, without defatting and/or drying the hair and skin and without irritating the ocular mucosae or leaving skin taut after frequent use. Most lathering soaps, shower and bath products, shampoos and bars fail in this respect.
Certain synthetic surfactants are known to be mild. However, a major drawback of some mild synthetic surfactant systems when formulated for shampooing or personal cleansing is that they have what can be described as a “slippy” or “non-draggy” rinse feel which is not liked by some consumers. The use of certain surfactants such as potassium laurate, on the other hand, can yield a “draggy” rinse feel but at the expense of clinical skin mildness. These two facts make the selection of suitable surfactants in the rinse feel and mildness benefit formulation process a delicate balancing act.
Thus a need exists for personal cleansing compositions which deliver a “draggy” rinse feel while at the same time having excellent skin mildness, in addition to excellent product characteristics such as lather, cleansing, stability, thickening, rheology and in-use skin feel attributes.
It is also desirable to deliver skin active components to the skin from a personal cleansing composition. Such skin active components include for example sunscreens, antimicrobials and vitamins. Attempts have been made in the past to deliver skin care actives from personal cleansing compositions. However, these have not always been successful from the viewpoint of providing sufficient deposition of these actives on the skin such that they can be effective.
WO97/16168 discloses personal cleansing compositions comprising (a) surfactant, (b) a hydrophobic active component selected from skin conditioning, skin protection and antibacterial agents, (c) a hydrocarbon containing component and (d) a cationic polymer, the quantities of (c) and (d) selected so that the effect on the skin by component (b) is enhanced over the additive effects of (c) and (d) alone.
Surprisingly, it has now been found that personal cleansing compositions having improved deposition of hydrophobic skin care actives at the same time as having a draggy rinse feel and excellent mildness characteristics are provided by the combination of certain water-insoluble oils, such as certain polyalphaolefin oils and certain hydrophobic skin active components, in combination with a mild, water-soluble surfactant system.
SUMMARY OF THE INVENTION
According to the present invention there is provided a rinse-off liquid personal cleansing composition comprising:
(a) water;
(b) from about 1% to about 60% by weight of a water-soluble surfactant,
(c) a water-insoluble oil selected from highly branched polyalphaolefins having the following formula:
wherein R
1
is H or C
1
-C
20
alkyl, R
4
is C
1
-C
20
alkyl, R
2
is H or C
1
-C
20
, and R
3
is C
3
-C
20
preferably from C
5
-C
20
, n is an integer from 0 to 3 and m is an integer of from 1 to 1000 and having a number average molecular weight of from about 1000 to about 25,000; and
(d) a hydrophobic skin active component selected from antimicrobial agents, sunscreens, vitamins, perfume oils insect repellants, anti fungal agents, and mixtures thereof, wherein the hydrophobic skin active component has a ClogP value of greater than 3.
The compositions of the present invention provide an improvement in deposition of skin active components while at the same time being exceptionally mild to the skin and providing a “draggy” rinse feel.
All concentrations and ratios herein are by weight of the cleansing composition, unless otherwise specified. Surfactant chain lengths are also on a weight average chain length basis, unless otherwise specified.
DETAILED DESCRIPTION OF THE INVENTION
The liquid cleansing compositions herein comprise water, surfactant, hydrophobic skin active component, and a certain water-insoluble oil which will be described below.
As used herein the term “rinse feel” means the feeling of the skin during the process of rinsing lather from the skin after cleansing with a cleansing composition. The type of rinse feel which is provided by the compositions of the present invention can be described by terms such as a “draggy” rinse feel, a “soap-like” rinse feel and a “non-slippery” or “non-slimy” rinse feel. Such a “draggy”, “soap-like”, “non-slippery” or “non-slimy” rinse feel can be detected by an increase in friction between the hand and skin during the process of rinsing lather from the skin.
As used herein the term “water-insoluble” in relation to oils is a material which is substantially insoluble in distilled water at room temperature without the addition of other adjuncts and/or ingredients such as described herein.
As used herein the term “hydrophobic” in relation to skin active component means a material which is more lipid soluble, i.e. non aqueous soluble, than aqueous soluble. It is preferred that the materials have little solubility in water and are essentially nonionic in character as opposed to ionic.
Water-insoluble Oil
The water-insoluble oil for use herein is selected from (a) highly branched polyalphaolefins having the following formula:
wherein R
1
is H or C
1
-C
20
alkyl, R
4
is C
1
-C
20
alkyl, R
2
is H or C
1
-C
20
, and R
3
is C
3
-C
20
, preferably C
5
-C
20
, n is an integer from 0 to 3 and m is an integer of from 1 to 1000 and having a number average molecular weight of from about 1000 to about 25,000, preferably from about 2500 to about 6000, more preferably from about 2500 to about 4000. Preferably the polyalphaolefins of type (a) use herein have a viscosity of from about 300 cst to about 50,000 cst, preferably from about 1000 cst to about 12,000 cst, more preferably from about 1000 cst to about 4000 cst at 40° C. using the ASTM D-445 method for measuring viscosity. The oils of type (a) may also have a degree of unsaturation, but are preferably saturated.
Suitable polyalphaolefins of type (a) as described above can be derived from 1-alkene monomers having from about 4 to about 20 carbon atoms, preferably from about 6 to about 12 carbon atoms, especially from about 8 to about 12 carbon atoms. The polyalphaolefins useful herein are preferably hydrogenated polyalphaolefin polymers.
Non-limiting examples of 1-alkene monomers for use in preparing the polyalphaolefin polymers herein include 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, branched chain isomers such as 4-methyl-1-pentene, and combinations thereof. Also suitable for preparing the polyole
Dawson George Geoffrey
Vanoosthuyze Kristina
Boyer Charles
Clay Cynthia L.
Howell John M.
Rosnell Tara M.
The Procter & Gamble & Company
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