Aqueous cosmetic preparations in stick form

Details Aqueous cosmetic preparations in stick form Aqueous cosmetic preparations in stick form

2000-10-11

2002-08-06

Dees, Jose′ G. (Department: 1616)

Drug, bio-affecting and body treating compositions

Anti-perspirants or perspiration deodorants

C424S401000

Reexamination Certificate

active

06428776

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to aqueous, soap- and wax-free cosmetic stick preparations comprising glucosides, oily substances and selected emulsifiers, and to the use of the mixtures for the preparation of deodorant sticks.
Water-containing cosmetic stick preparations which are to be found on the market as antiperspirant or deodorant products largely comprise soap (sodium stearate), oily substances and bactericides. They have an alkaline pH of about 9. The soapy feel on the skin associated with these sticks is regarded by the consumer as a disadvantage. A more recent development relates to sticks which comprise known antiperspirant active ingredients, such as, for example, aluminum chlorohydrate (ACH). They have to be formulated at an acidic pH of about 4 and for this require specific thickener systems, such as, for example, polydiols in combination with dibenzylidene sorbitol. In addition, for many years, there has been a large number of antiperspirant sticks based on natural or synthetic waxes on the market in which the active ingredient is incorporated as a powder into the wax matrix. The disadvantage here is that the sticks are very greasy, and a white residue often remains on the skin.
The complex object of the present invention was therefore to provide stick preparations which are free from the disadvantages described. In particular, the sticks were to be free from soaps so that acidic active ingredients can be incorporated, and also were not to contain waxes in order to avoid residues on the skin. At the same time, the sticks were to be notable for improved feel on the skin, high consistency and thermal resistance, and transparency or whiteness.
BRIEF SUMMARY OF THE INVENTION
The invention provides aqueous cosmetic preparations in stick form comprising
(a) alkyl and/or alkenyl oligoglycosides,
(b) oily substances and
(c) nonionic emulsifiers,
with the proviso that the preparations are free from soaps and natural waxes.
DETAILED DESCRIPTION OF THE INVENTION
Surprisingly, we have found that the preparations according to the invention not only exhibit sufficiently high consistency and thermal resistance, but also impart an advantageous feel to the skin. The preparations are soap-free and therefore permit the incorporation of acidic active ingredients, such as, for example, aluminum chlorohydrate. In this connection, the invention incorporates the knowledge that during the formulation it is possible to use not only active ingredient powders, but also aqueous solutions directly, which considerably simplifies the preparation and the homogeneous distribution within the stick. The sticks are transparent gels or pure white and do not leave behind any undesired residues upon application.
Alkyl and/or Alkenyl Oligoglycosides
Alkyl and alkenyl oligoglycosides are known nonionic surfactants which conform to the formula (I)
R
1
O—[G]
p
  (I)
in which R
1
is an alkyl and/or alkenyl radical having from 8 to 22 carbon atoms, G is a sugar radical having 5 or 6 carbon atoms, and p is a number from 1 to 10. They can be obtained by the relevant processes of preparative organic chemistry, for example by acid-catalyzed acetalation of glucose with fatty alcohols.
The alkyl and/or alkenyl oligoglycosides can be derived from aldoses or ketoses having 5 or 6 carbon atoms, preferably glucose. The preferred alkyl and/or alkenyl oligoglycosides are therefore alkyl and/or alkenyl oligoglucosides. The index number p in the general formula (I) gives the degree of oligomerization (DP), i.e. the distribution of mono- and oligoglycosides, and is a number between 1 and 10. While p in a given compound must always be a whole number and here can assume in particular the values p=1 to 6, for a particular alkyl oligoglycoside, p is an analytically determined arithmetical value which is in most cases a fraction. Preference is given to using alkyl and/or alkenyl oligoglycosides having an average degree of oligomerization p of from 1.1 to 3.0. From an application viewpoint, preferred alkyl and/or alkenyl oligoglycosides are those whose degree of oligomerization is less than 1.7 and in particular between 1.2 and 1.4. The alkyl or alkenyl radical R
1
can be derived from primary alcohols having from 8 to 22, preferably from 12 to 16, carbon atoms. Typical examples are octanol, decanol, lauryl alcohol, myristyl alcohol, cetyl alcohol, palmoleyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, elaidyl alcohol, petroselinyl alcohol, arachidyl alcohol, gadoleyl alcohol, behenyl alcohol, erucyl alcohol, brassidyl alcohol, and technical-grade mixtures thereof, which can be obtained as described above. Preference is given to alkyl oligoglucosides based on lauryl and/or myristyl alcohol, and corresponding technical-grade coconut fatty alcohol cuts having a DP in the range from 1 to 3. The proportion of glucosides in the preparations can be from 1 to 40% by weight and, preferably, from 3 to 30% by weight.
Oily Substances
Suitable oily substances are, for example, Guerbet alcohols based on fatty alcohols having from 6 to 18, preferably from 8 to 10, carbon atoms, esters of linear C
6
-C
22
-fatty acids with linear C
6
-C
22
-fatty alcohols, esters of branched C
6
-C
13
-carboxylic acids with linear C
6
-C
22
-fatty alcohols, esters of linear C
6
-C
22
-fatty acids with branched alcohols, in particular 2-ethylhexanol, esters of linear and/or branched fatty acids with polyhydric alcohols (such as, for example, propylene glycol, dimerdiol or trimertriol) and/or Guerbet alcohols, triglycerides based on C
6
-C
10
-fatty acids, liquid mono-/di-/triglyceride mixtures based on C
6
-C
18
-fatty acids, esters of C
6
-C
22
-fatty alcohols and/or Guerbet alcohols with aromatic carboxylic acids, in particular benzoic acid, esters of C
2
-C
12
-dicarboxylic acids with linear or branched alcohols having from 1 to 22 carbon atoms or polyols having from 2 to 10 carbon atoms and from 2 to 6 hydroxyl groups, vegetable oils, branched primary alcohols, substituted cyclohexanes, linear C
6
-C
22
-fatty alcohol carbonates, Guerbet carbonates, esters of benzoic acid with linear and/or branched C
6
-C
22
-alcohols (e.g. Finsolv® TN), dialkyl ethers, ring-opening products of epoxidized fatty acid esters with polyols, silicone oils and/or aliphatic or naphthenic hydrocarbons. The proportion of oily substances in the preparations can be from 1 to 50% by weight and, preferably, from 3 to 30% by weight.
Nonionic Emulsifiers
Suitable nonionic emulsifiers are, for example, nonionic surfactants from at least one of the following groups:
(c1) addition products of from 2 to 30 mol of ethylene oxide and/or from 0 to 5 mol of propylene oxide to linear fatty alcohols having from 8 to 22 carbon atoms, to fatty acids having from 12 to 22 carbon atoms and to alkylphenols having from 8 to 15 carbon atoms in the alkyl group;
(c2) C
12/18
-fatty acid mono- and diesters of addition products of from 1 to 30 mol of ethylene oxide to glycerol;
(c3) glycerol mono- and diesters and sorbitan mono- and diesters of saturated and unsaturated fatty acids having from 6 to 22 carbon atoms and the ethylene oxide addition products thereof;
(c4) addition products of from 1 to 60 mol of ethylene oxide to castor oil and/or hydrogenated castor oil;
(c5) polyol and, in particular, polyglycerol esters, such as, for example, polyglycerol polyricinoleate or polyglycerol poly-12-hydroxystearate. Mixtures of compounds from two or more of these classes of substance are also suitable;
(c6) addition products of from 2 to 15 mol of ethylene oxide to castor oil and/or hydrogenated castor oil;
(c7) partial esters based on linear, branched, unsaturated or saturated C
12/22
-fatty acids, ricinoleic acid, and 12-hydroxystearic acid and glycerol, polyglycerol, pentaerythritol, dipentaerythritol, sugar alcohols (e.g. sorbitol), alkyl glucosides (e.g. methyl glucoside, butyl glucoside, lauryl glucoside) and polyglucosides (e.g. cellulose);
(c8) mono-, di- and/or trialkyl phosphates;
(c9) wool wax alcohols;
(c10) polysiloxane-polyalkyl-polyethe

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