Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-10-24
2002-12-03
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...
C510S119000, C510S130000, C510S466000
Reexamination Certificate
active
06489274
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to liquid rinse-off compositions for personal care comprising high purity trimethylsilyl-alkylsilsesquioxanes, particularly trimethylsilyl-n-octylsilsesquioxanes (caprylyl trimethicones). Said rinse-off compositions provide excellent rinse feel and skin mildness. They are suitable for simultanously cleansing and conditioning of the skin and/or the hair and can be used in the form of foam bath preparations, shower products, skin cleansers, hand cleansers, face cleansers and body cleansers, shampoos etc.
BACKGROUND OF THE PRESENT INVENTION
In recent years there has been a fast development in the field of skin and hair care. Improved products, according to the actual trends, were offered to the customers. The development is focused on rinse-off formulations which guarantee effective cleansing together with other supplemental benefits such as improved sensory, conditioning, gloss and sheen properties. The patent literature describes several ways to achieve the above-mentioned goals. Among others, silicones are found in many personal care products including topical skincare products, 2-in-1 hair shampoo-conditioners, color cosmetics (mascara, lipstick), anti-perspirants and deodorants. Dimethylsilicones, both linear and cyclic, are proposed to improve the sensory properties. Unfortunately said dimethylsilicones are generally not compatible with water. Also they show little compatibility with many organic materials used in cosmetic formulations. Phenyl trimethicones are another class of silicones often used in cosmetic industry.
In recent years considerable research concerning the ultimate fate of organosilicones (atmosphere, lakes and rivers rivers) has been carried out. For example phenyl substituents are oxidized and/or homolytically cleaved off to form benzene and/or phenol. Both are pollutants of the environment.
DESCRIPTION OF THE PRESENT INVENTION
We have now found that trimethylsilylalkylsilsesquioxanes are particularly suitable for use in formulating liquid rinse-off compositions for personal care.
Surprisingly it has been found that said trimethylsilyl-alkylsilsesquioxanes are particularly useful for formulating shampoos additionally containing insoluble components, preferably peariescing and/or opacifying agents. Trimethylsilyl-octylsilsesquioxanes (caprylyl trimethicones) can be stabilized over a long period of time and over broad temperature ranges in the presence of pearlizing or opacifying agents. Said trimethylsilyl-alkylsilsesquioxanes considerably increase the gloss and sheen of the hair and also considerably increase the emolliency and water repellency of the skin. During the application they provide enhanced spreadability, lubricity and reduced tackiness. Advantageously said trimethylsilyl-alkylsilsesquioxanes are environmentally friendly and show excellent compatibility with many organic materials used in cosmetic formulations.
Therefore, the present invention provides liquid rinse-off compositions for personal care comprising
at least 0.1% by weight of at least one trimethyl-silylalkylsilsesquioxane of formula (1)
Me
3
SiO—[Si(R)(OSiMe
3
)O]
x
—SiMe
3
(1)
wherein Me is methyl, R is a straight or branched alkyl group having from 6 to 18 carbon atoms and x is a number from 1 to 10,
at least 2% by weight of water-soluble surfactants and,
at least 50% by weight of water.
R in formula (1) has preferably from 6 to 14 carbon atoms. Particularly preferred as trimethyl-silylalkylsilsesquioxanes of formula (1) are trimethylsilyl-n-octylsilsequioxanes (caprylyl trimethicones) wherein R is an n-octyl group —C
8
H
17
. Preferably the trimethyl-silylalkylsilsesquioxanes are compounds according to formula (1) wherein x is a number from 1 to 6. More preferred x is equal to 1, 2, 3 and/or 4.
Surprisingly it has been found that trimethylsilylalkyl-silsesquioxane of formula (1), which are substantially free of alkoxysilanes, chlorosilanes, silanol functionalities and organic and/or inorganic compounds, are particularly useful for the present invention. More preferred the trimethylsilylalkyl-silsesquioxanes of formula (1) contain less than 3% by weight, more preferred less than 1% by weight, of alkoxysilanes, chlorosilanes, silanol functionalities and organic and/or inorganic compounds. Such high purity trimethylsilylalkyl-silsesquioxanes of formula (1) can be prepared according to the process described in U.S. Pat. No. 5,932,231 by hydrolyzing a mixture of pure trimethylchlorosilane and pure alkyltrichlorosilane having from 6 to 18, preferably 6 to 14, carbon atoms with distilled water in an amount sufficient to produce an aqueous layer of less than about 25 weight percent hydrochloric acid, maintaining the temperature of the hydrolysis reaction mixture below about 90° C., to form a silicone intermediate; washing residual acid from the silicone reaction intermediate; and azeotropicallay removing water from the washed silicone intermediate to produce a dried silicone reaction intermediate; and trimethylsilylating the silanol groups in the dried silicone reaction intermediate with at least a stoichiometric amount of hexamethyldisiloxane in the presence of an acid catalyst.
All the embodiments of the process described in U.S. Pat. No. 5,932,231 are hereby incorporated by reference into the description of the present application.
Preferably the rinse-off compositions comprise from 0.1 to 5% by weight, more referred from 0.2 to 2.5% by weight, particularly preferred from 0.5 to 1.5% by weight, of trimethyl-silylalkylsilsesquioxanes of formula (1). It is an essential feature of the invention that the the rinse-off compositions comprise at least 2% by weight of water-soluble surfactants.
Preferably the rinse-off compositions comprise from 2 to 40% by weight, more preferred from 3 to 20% by weight, particularly preferred from 5 to 15% by weight, of water-soluble surfactants.
Said water-soluble surfactants can be selected from anionic, cationic, amphoteric, zwitterionic and/or nonionic surfactants. Preferably the rinse-off compositions contain mixtures of surfactants. Anionic surfactants are preferably present at levels from 0.1 to 20% by weight, more preferred from 0.1 to 15% by weight, particularly preferred from 1 to 10% by weight.
Cationic surfactants are preferably present at levels from 0.1 to 20% by weight, more preferred from 0.1 to 15% by weight, particularly preferred from 1 to 10% by weight.
Amphoteric surfactants are preferably present at levels from 0,1 to 20% by weight, more preferred from 1 to 8% by weight.
Zwitterionic surfactants are preferably present at levels from 0,1 to 20% by weight, more preferred from 0,1 to 10% by weight, particularly preferred from 1 to 8% by weight.
Nonionic surfactants are preferably present at levels from 0,1 to 20% by weight, more preferred from 1 to 8% by weight.
In a preferred embodiment the rinse-off compositions contain a mixture of anionic and zwitterionic and/or amphoteric surfactants.
The weight ratio of anionic surfactants to zwitterionic and/or amphoteric surfactants is preferably from 1:10 to 10:1, more prefered from 1:5 to 5:1, particularly preferred from 1:3 to 3:1.
In another preferred embodiment the rinse-off compositions contain anionic, zwitterionic and/or amphoteric surfactants together with at least one nonionic surfactant.
Preferred anionic surfactants are alkyl sulfates; ethoxylated alkyl sulfates, such as laureth-2-sulfate; sodium laureth-3 sulfate; ammonium laureth-3 sulfate, magnesium laureth-3,6 sulfate; salts of sulfuric acid esters; alkyl ethoxy carboxylates; alkyl glyceryl ether sulfonates; ethoxy ether sulfonates; methyl acyl taurates; fatty acyl glycinates; N-acyl glutamates; acyl isethionates; alkyl sulfosuccinates; alkyl ethoxysulphosuccinates; alpha-sulfonated fatty acids and salts and/or esters thereof; alkyl phosphate esters; ethoxylated alkyl phosphate esters; acyl sarcosinates; fatty acid/protein condensates; soaps (e.g. ammonium-, magnesium-, potassium-, sodium salts of lauric acid, myristic acid, palmitic acid); acyl aspartates; alkoxy c
Figueroa Ray
Klug Peter
LeGrow Gary E.
Terry, Jr. W. Leonard
Turowski Angelika
Boyer Charles
Clariant International Ltd.
Silverman Richard P.
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