Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-06-02
1999-06-08
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510123, 510125, 510127, 510137, 510138, 510158, 510159, 510473, 24 7012, 24 7013, 24 7016, 24 7019, 24 7021, 24 7022, 24 7024, 24 7031, 514846, C11D 188, C11D 194, C11D 320
Patent
active
059104724
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to cleansing compositions. In particular it relates to mild personal cleansing compositions with good skin feel attributes, rheological behaviour 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 keratin and collagen fibrous proteins that form the skeleton of its structure. The outermost of these layers, referred to as the stratum corneum, is known to be composed of 250 .ANG. protein bundles surrounded by 80 .ANG. thick layers. 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. 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 interact with the keratin and hair proteins creating irritation and loss of barrier and water retention functions.
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 most mild synthetic surfactant systems when formulated for shampooing or personal cleansing is poor lather performance compared to the highest shampoo and bar soap standards. Thus, surfactants that are among the mildest are marginal in lather. The use of known high sudsing anionic surfactants with lather boosters, on the other hand, can yield acceptable lather volume and quality but at the expense of clinical skin mildness. These two facts make the surfactant selection, the lather and mildness benefit formulation process a delicate balancing act.
In addition to the cleansing and lathering performance attributes desired by consumers it is of particular value that personal cleansing products further deliver certain in-use rheological properties. In particular a shower gel product which is capable of demonstrating shear thinning behaviour during application to the skin is preferred by consumers. It is known that water soluble polymers can be used to provide product thickening attributes and furthermore that hydrophobically modified water soluble polymers can exhibit enhanced product thickening behaviour and impart shear thinning characteristics. However it is also known that such product thickening / shear thinning effects are affected by the total surfactant level present in the system and in fact the thickening/thinning attributes can be significantly diminished in the presence of even very low levels of water soluble surfactants. A secondary effect of high surfactant and electrolyte concentration in systems containing hydrophobically modified water soluble polymers (HMWSPs) is that at increased surfactant levels the HMWSP can become increasingly insoluble in the product matrix.
Thus a need exists for personal cleansing products which deliver acceptable in-use skin feel characteristics but which will not dehydrate the skin or result in loss of skin suppleness, which will provide a level of skin conditioning performance in a wash and rinse-off product which previously has only been provided by a separate post-cleansing cosmetic moisturizer, which demonstrate desirable in-use rheology behaviour and which will produce a foam which is stable and of high quality, which are effective hair a
REFERENCES:
patent: 4228277 (1980-10-01), Landoll
patent: 5120532 (1992-06-01), Wells et al.
patent: 5409640 (1995-04-01), Giret et al.
patent: 5439682 (1995-08-01), Wivell et al.
Elliott Russell Phillip
Green Matthew Thomas
Leahy Christopher David
Papadimitriou Eleni
Allen George W.
Delcotto Gregory R.
Lieberman Paul
Little Darryl C.
Reed T. David
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