Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-05-01
2002-04-23
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S138000
Reexamination Certificate
active
06376438
ABSTRACT:
The invention relates to hydrous, liquid, pasty or creamy hand cleansing agents having improved dermatological compatibility and to the use of said agents for removing extreme contaminations.
Coarse hand cleansers preferably are used in those cases where contaminations such as lacquers, fats, oils, lubricants, metal dusts, graphite, carbon black and the like are to be expected. For example, such cleansing agents are known according to H. Tronnier, J. Kresken, K. Jablonski, B. Komp, Haut und Beruf, Grosse Verlag, Berlin, 1989, pp. 75-108. Formulations containing an abrasive, a surfactant/surfactant mixture, thickening agents, and optionally, auxiliary agents to control consistency, appearance, odor, and stability, such as pigments, odorous substances, stabilizers, and preservatives are known in general. For particularly persistent contaminations, products added with organic solvents such as aliphatic hydrocarbons, terpenes, carboxylic esters of the dimethyl adipate, dimethyl glutarate, dimethyl succinate, and di-n-butyl adipate or di-isopropyl adipate types are available, such as described in DE 43 35 933 A1.
Referring to the industrial sector, the more frequently such products are applied on the skin (up to 6 times per day and more), the more clearly the detrimental effects of surfactants and particularly solvents come to the fore, namely, defatting and dehydration of the skin by destroying the hydro-lipid mantle of the skin. As a result, there is enhanced absorption of toxic and allergenic substances or infestation by microorganisms, or, as a consequence, toxic or allergic skin reactions occur.
More recently, coarse hand cleansers have become familiar which include a grape seed oil in addition to the surfactants coconut fatty acid monoethanolamide, cocamidopropyldimethylglycine, C9-11-Pareth-6 and sulfated castor oil. These agents are subject to restrictions with respect to their dissimilarity and their cleaning efficiency. Furthermore, the surfactants coconut fatty acid monoethanolamide and cocamidopropylbetaine are known to involve a sensitization risk.
The DE 44 24 210 A1 describes non-hydrous shower oils containing at least 45 wt.-% of an oil selected from the group of oils having a high content of triglycerides, saturated and/or unsaturated fatty acids, such as soya oil, sunflower oil, wheat germ oil, and 55 wt.-% at maximum of surfactants, preferably monoisopropanolaminelauryl ether sulfate, coconut fatty acid diethanolamide. These formulations involve the following drawbacks: 1. their cleaning efficiency is not adequate to remove extreme contaminations, and 2. they contain fatty acid mono- or diethanolamides which, according to Fiedler, Edito Cantor verlag, 4th edn., 1996, p. 376, are known to involve a sensitization risk.
Hydrous shower formulations are known from EP 0,769,292 A1 wherein, in addition to surfactant mixtures, colza oil or colza oil derivatives are used as skin care components. Due to their lacking cleaning efficiency, these agents neither are suited as coarse hand cleansers.
As a result of the above-described detrimental effects of conventional agents, the object therefore is to provide a hand cleansing agent which is highly skin-compatible in dermatological terms, preferably a coarse hand cleanser which, even when used several times a day on healthy skin, induces only minor dehydration of the skin. Furthermore, surfactants involving a sensitization risk should be excluded.
Amazingly and unpredictably according to prior art, hydrous, liquid, pasty or creamy hand cleansers free of solvents, particularly coarse hand cleansers can be obtained which accomplish the given object.
They are characterized by a content of
a) 10-30 wt.-%, relative to the composition of the hand cleansing agent, of one or more vegetable oils from the group of triglycerides, saturated and/or unsaturated fatty acids, preferably triglycerides having an elevated percentage of unsaturated fatty acids, more preferably colza oil, soya oil and/or linseed oil;
b) 10-30 wt.-%, relative to the composition of the hand cleansing agent, of a surfactant composition containing
&agr;) at least one fatty alcohol ethoxylate,
&bgr;) at least one fatty alcohol ether sulfate, and
&ggr;) at least one salt of a sulfurated, preferably sulfonated fatty acid;
c) 10-65 wt.-% of water, relative to the composition of the hand cleansing agent;
d) optionally 1-30 wt.-%, relative to the composition of the hand cleansing agent, of one or more abrasives, preferably plastic abrasive agents based on polyethylene or polyurethane, abrasive agents based on natural kernel and/or shell meals, preferably bleached natural shell and/or kernel meals such as H
2
O
2
-bleached meals of walnut shells, almond shells or hazelnut shells, meals of olive, apricot or cherry kernels, or any mixture of these shell and kernel meals, more preferably H
2
O
2
-bleached walnut shell meal, and/or beads of waxes, preferably jojoba waxes;
e) optionally one or more viscosity-building agents, preferably organophilic and/or hydrophilic layer silicates, with bentonites being particularly preferred, polysaccharides, preferably cellulose, guar meal and/or xanthans, modified polysaccharides, preferably cellulose ethers, carboxymethylcellulose and/or hydroxyethylcellulose, and/or inorganic electrolytes, preferably NaCl and/or MgSO
4
;
f) optionally further cosmetic adjuvants, additives and/or active substances such as pH regulators, odorous substances, preservatives, such as organic acids, and antioxidants such as vitamin E acetate;
the sum of components a) through f) invariably being required to make 100 wt.-%.
Preferably, fatty alcohol ethoxylates having the structure
R—O—(CH
2
—CH
2
—O)
n
H
wherein R represents a C
8
-C
18
, preferably C
10
-C
16
, more preferably C
11
-C
14
saturated or unsaturated, branched or unbranched alkyl residue, and n represents an integer from 1 to 8, preferably 3-6, more preferably 5-7, are employed in component b) and, in particular, laureth-6 having R=C
12
and n=6 is used.
Fatty alcohol ether sulfates preferably to be used in component b) are those of general formula
R—O—(CH
2
—CH
2
-O)
n
SO
3
X
wherein R represents a C
10
-C
16
, preferably C
11
-C
14
saturated or unsaturated, branched or unbranched alkyl residue, n represents an integer from 1 to 6, preferably 1-4, and X represents Na
+
, NH
4
+
or Mg
2+
, and it is particularly preferred to use sodium lauryl ether sulfate (having R=C
12
, n=2-3, and X=Na
+
).
Alkali or alkaline earth salts Of C
8
-C
30
, preferably C
10
-C
22
fatty acids, more preferably castor oil sulfates, and particularly the Na
+
or NH
4
+
sulfates are used as salts of sulfurated, preferably sulfonated fatty acids.
Monobrilliantöl® (Stockhausen GmbH & Co. KG) or Standapol SCO® (Henkel KGaA) is suited as castor oil sulfonate.
The surfactant compositions used according to the invention have no (or exceedingly low) sensitizing effect.
Surprisingly, it was found that the present object can only be accomplished if the provision is observed that the content of vegetable oil in the coarse hand cleanser composition is higher or equal to the content of fatty alcohol ethoxylates and the content of fatty alcohol ethoxylates is higher or equal to the content of the two components fatty alcohol ether sulfate and sulfurated fatty acids.
Accordingly, the content of 10-30 wt.-% of surfactant composition includes 5-28 wt.-%, preferably 7-25 wt.-% of component &agr;, 1.9-15 wt.-%, preferably 3-10 wt.-% of component &bgr; and 0.1-10 wt.-%, preferably 0.5-6 wt.-% of component &ggr;.
It is particularly preferred that the amount of 10-30 wt.-% of surfactant composition be comprised of 5-28 wt.-% of laureth-6, 1-10 wt.-% of sodium laureth sulfate (=sodium lauryl ether sulfate having 2 to 3 EO), and 1-10 wt.-% of castor oil sulfonate.
The hand cleansing agents according to the invention do not include any organic solvents.
The hand cleansing agents are produced in a continuous or batchwise fashion, using well-known devices. Suitable devices a
Bruecher Beatrice
Klotz Andreas
Rosenberger Volker
Veeger Marcel
Gupta Yogendra N.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Petruncio John M
Stockhausen GmbH & Co. KG
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