EP0714278A1

EP0714278A1 - Mild aqueous shaving compositions

Info

Publication number: EP0714278A1
Application number: EP94926200A
Authority: EP
Inventors: Willi Breitzke; Ansgar Behler
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 1993-08-24
Filing date: 1994-08-16
Publication date: 1996-06-05
Also published as: DE4328355A1; WO1995005798A1; JPH09501687A

Abstract

Mild aqueous shaving compositions contain (a) 30-70 % by weight alkyl and/or alkenyl oligoglycosides; (b) 10-40 % by weight fatty acid monoglyceride sulphates; and (c) 15-35 % by weight polyols with 3 to 6 carbon atoms and 2 to 6 hydroxyl groups, in relation to the proportion of active substance in the composition, as well as optionally other usual auxiliary agents and additives.

Description

Mild watery shaving preparations

Field of the Invention

The invention relates to mild aqueous shaving preparations with a content of alkyl and / or alkenyl oligoglycosides, fatty acid monoglyceride sulfates and polyols and the use of such mixtures for the preparation of the preparations.

State of the art

Conventional water-containing shaving creams based on alkali soaps and glycerol have considerable problems with regard to their manufacturability and their use above normal temperature (20 ° C.). In the course of the production of such shaving creams, a mixture of sodium and potassium hydroxide solutions is usually added to the melted fatty acid. This process is referred to below as saponification. The resulting alkali soaps lead to gel formation, which is associated with a considerable increase in the viscosity of the system. It is no longer possible to overcome the high shear forces in such solidified mixtures with conventional stirrers, but requires complex apparatus measures. Another problem lies in the fact that shaving creams which are produced by saponification of vegetable or animal fats are generally alkaline, which can lead to irritation in sensitive skin.

Shaving creams are mostly sold in tubes. In the application, one presses a little cream onto a moistened shaving brush and then soaped the body parts to be shaved. Conventional shaving creams, however, have the disadvantage of cementing at temperatures above room temperature, as occurs, for example, in summer or in hot countries. This lack of deformability, for example, makes it no longer possible to apply it from a tube.

In the past there has been no lack of attempts to provide shaving preparations which are more or less free from the defects mentioned. EP-Bl 0 070 074 (Procter & Gamble), for example, discloses foaming surfactant mixtures which, in addition to alkyl oligoglucosides, contain anionic surfactants with sulfate, sulfonate or carboxylate groups. The mixtures form stable foams and are suitable, for example, for shaving creams. Japanese patent application JP 91/131 680 (Kao) relates to foaming compositions containing alkyl oligoglycosides and a blowing agent; reference is made to the use of this mixture in shaving foams.

In practice, however, these prior art teachings have also proven unsatisfactory: alkyl oligoglucosides are known to be extremely skin-friendly, for use in soap-free shaving creams, however, neither the foaming power is sufficient nor the deformability at higher storage temperatures. By mixing alkyl oligoglucosides with the sulfate or sulfonate surfactants mentioned in EP-Bl 0 070 074, for example alkyl sulfates, alkyl ether sulfates, alkylbenzenesulfonates and olefin sulfonates, the foam formation can be increased, but the dermatological compatibility of the preparations sig¬ decreases significant from; in addition, these mixtures also show no satisfactory deformability.

The object of the present invention was therefore to develop mild, pH-neutral aqueous shaving preparations which are distinguished both by improved deformability at temperatures up to 45 ° C. and by advantageous foaming power. In addition, these preparations should be homogeneous, have a good consistency and an attractive gloss.

Description of the invention

The invention relates to mild aqueous shaving preparations containing

a) 30-70 wt .-% alkyl and / or alkenyl oligoglycosides; b) 10-40 wt .-% fatty acid monoglyceride sulfates and c) 15-35 wt .-% polyols with 3 to 6 carbon atoms and 2 to 6 hydroxyl groups - each based on the active substance content of the preparations - and, if appropriate, other customary auxiliaries and additives.

Surprisingly, it has been found that the surfactants in the preparations according to the invention are synergistically enhanced with regard to their foaming power and their skin-cosmetic tolerance. The proportion of alkyl and / or alkenyl oligoglycosides, fatty acid monoglyceride sulfates and polyols according to the invention also ensures that there are no undesirably high viscosities in the preparation of the shaving creams and that production is possible with the aid of simple stirrers; homogenization as an additional processing step can therefore be dispensed with. In addition, it is achieved that the preparations cannot be cemented even at temperatures above 30 to 40 ° C. and can easily be deformed, so that, for example, application from a tube is easily possible. Finally, the agents according to the invention are pH-neutral, homogeneous, have a nice gloss and a particularly creamy consistency.

From an application point of view, shaving preparations which contain components a) to c) in the following amounts have proven to be optimal:

a) 50-65 wt .-% alkyl and / or alkenyl oligoglycosides; b) 10-20% by weight of fatty acid monoglyceride sulfates and c) 10-30% by weight of polyols with 3 to 6 carbon atoms and 2 to 6 hydroxyl groups

- each based on the active substance content of the preparations. A particularly advantageous synergistic reinforcement of the The property profile can be observed if components a) and b) are used in a weight ratio of 75:25 to 85:15.

Alkyl and / or alkenyl oligonucleosides

Alkyl and alkenyl oligoglycosides are known substances which can be obtained by the relevant processes in preparative organic chemistry. Representative of the extensive literature, reference is made here to the publications EP-Al-0 301 298 and WO 90/3977. The alkyl and / or alkenyl oligoglycosides follow the formula (I)

Rl_0- [G] _p (I)

in which R ^{1 stands} for alkyl and / or alkenyl residues with 6 to 22 carbon atoms, G for a sugar residue with 5 or 6 carbon atoms and p for numbers from 1 to 10.

The alkyl and / or alkenyl oligoglycosides can be derived from aldoses or ketoses with 5 or 6 carbon atoms, preferably glucose. The preferred alkyl and / or alkenyl oligoglycosides are thus alkyl and / or alkenyl oligoglucosides.

The index number p in the general formula (I) indicates the degree of oligomerization (DP degree), ie the distribution of mono- and oligoglycosides, and stands for a number between 1 and 10. While p in a given compound must always be an integer and here above all assume the values p = 1 to 6 can, the value p for a certain alkyl oligoglycoside is an analytically determined arithmetic parameter, which usually represents a fractional number. Alkyl and / or alkenyl oligoglycosides with an average degree of oligomerization p of 1.1 to 3.0 are preferably used. From an application point of view, preference is given to alkyl and / or alkenyl oligoglycosides 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 6 to 11, preferably 8 to 10, carbon atoms. Typical examples are butanol, capronic alcohol, caprylic alcohol, capric alcohol and undecyl alcohol and their technical mixtures, such as are obtained, for example, in the hydrogenation of technical fatty acid methyl esters or in the course of the hydrogenation of aldehydes from Roelen's oxo synthesis. Alkyl oligoglucosides of chain length Cβ-Cio (DP = 1 to 3) are preferred, which are obtained as a preliminary step in the separation of technical Cg-Cig coconut fatty alcohol by distillation and are contaminated with a proportion of less than 6% by weight of Ci2-alcohol can and alkyl oligoglucosides based on technical Cg / n-oxo alcohols (DP = 1 to 3).

The alkyl or alkenyl radical R ^ can also be derived from primary alcohols having 12 to 22, preferably 12 to 14, carbon atoms. Typical examples are lauryl alcohol, myristyl alcohol, cetyl alcohol, palmoleyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, elaidyl alcohol, petroselinyl alcohol, arachyl alcohol, gadoleyl alcohol, behenyl alcohol, erucyl alcohol, and the like technical mixtures which can be obtained as described above. Alkyl oligoglucosides based on hydrogenated Ci2 / 14 ~ ^κ ° kosalcohol with a DP of 1 to 3 are preferred.

Fatty acid monoglyceride sulfates

Fatty acid monoglyceride sulfates are also known substances which can be obtained by the relevant methods of preparative organic chemistry. A preferred method for their production is to sulfate monoglycerides or triglyceride / glycerol mixtures with gaseous sulfur trioxide [WO 92/09 569, WO 92/09 570 (Henkel)].

Fatty acid monoglyceride sulfates which are suitable as component b) in the sense of the invention follow the formula (II),

CH2O-COR ²

I.

CH-OH (II)

I CH2O-SO3X

in which R ^ CO represents an aliphatic acyl radical having 6 to 22 carbon atoms and 0 and / or 1 to 3 double bonds and X represents alkali metal and / or alkaline earth metal, ammonium, alkylammonium or alkanolammonium.

Fatty acid monoglyceride sulfates are preferably used, the fatty acid components of which are derived from coconut oil and have 12 to 18, preferably 12 to 14, carbon atoms. Due to the manufacturing process, the monoglyceride sulfate can also contain small amounts of disulfate. The preferred counterion X is sodium, ammonium or magnesium.

Polyols

As polyols with 3 to 6 carbon atoms and 2 to 6 hydroxyl groups, for example ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, glycerin , Erythritol, pentaerythritol, trimethylolpropane, sorbitol, anhydrosorbitol, cyclohexanetriol, inositol. Propylene glycols and glycerol alone or mixtures of these polyols with sorbitol and / or butylene glycol are preferred. Glycerol is preferably used as the polyol component which keeps the shaving preparations moist.

Auxiliaries and additives

The shaving preparations according to the invention can also contain other customary auxiliaries and additives. Examples include perfume oils, superfatting agents such as cetyl alcohol, lanolin, stearyl alcohol, lecithin, isopropyl myristate, vase line or paraffin oil; softening agents such as sodium metasulfate or potassium metasulfate; Consistency regulators such as polyethylene glycols or their esters; Lubricants such as mineral oils; Stabilizers such as methyl cellulose or polyvinyl pyrrolidone. The shaving preparations can be protected against microbial spoilage by adding microbicidal substances. The proportion of optional auxiliaries and additives in the preparations can be 0.5 to 10% by weight; the proportion of components a) to c) is reduced accordingly. All percentage ranges are understood with the proviso that they add up to 100% by weight.

The shaving preparations according to the invention are produced, for example, by placing the surfactant ingredients as concentrates or aqueous solutions in a mixing container, heating with stirring and metering in the polyol and, if appropriate, other ingredients and the remaining water in portions. The active substance content of the preparations can be 60 to 85, preferably 70 to 80% by weight.

Industrial applicability

The aqueous shaving preparations according to the invention are pH-neutral, foam-strong, deformable even at higher storage temperatures and have a particularly high level of skin-cosmetic compatibility. They can also be produced and filled without viscosity problems.

Another object of the invention therefore relates to the use of mixtures containing

a) 30-70 wt .-% alkyl and / or alkenyl oligoglycosides; b) 10-40 wt .-% fatty acid monoglyceride sulfates and c) 15-35 wt .-% polyols with 3 to 6 carbon atoms and 2 to 6 hydroxyl groups and - each based on the active substance content of the preparations - and, if appropriate, other customary auxiliaries and additives for the production of aqueous shaving preparations.

The following examples are intended to explain the subject matter of the invention in more detail without restricting it.

Examples

I. Substances used

*** Plantaren ( ^R ) APG 600. Ci2 / 14- ^κ ° kosalkyloligoglucosid from Henkel KGaA, Düsseldorf / FRG. Average degree of oligomerization 1.3; 30% by weight aqueous paste.

*, ** CMGS. Ci2 / 14 ^{coconut mono} 9 ¹ y l ^ceridsu ^fat ^Natri ~ ^sa l ^{z Fa} - Henkel KGaA, Dusseldorf / FRG; 50% by weight aqueous paste.

*** Texapon ( ^R ) N70. Ci2 / i4 coconut fatty alcohol 2EO ether sulfate sodium salt from Henkel KGaA, Düsseldorf / FRG; 70% by weight aqueous paste.

*** Cutina ( ^R ) FS45. Fatty acid mixture from Henkel KGaA, Düsseldorf / FRG with the following C chain distribution: 51% C16: 0; 2% C17: 0; 44.5% C18: 0; 0.5% C18: 1; 2% <C16; the number after the colon indicates the number of double bonds.

*** Edenor ( ^R ) K12-18. Fatty acid mixture from Henkel KGaA, Düsseldorf / FRG with the following C chain distribution: 2% C10: 0; 52% C12: 0; 22% C14: 0; 12% C16: 0; 2% C18: 0; 9% C18: 1; 1% C18: 2. II. Examples of application technology

Shaving creams were produced in the following manner in accordance with the compositions given in Table 1: The ingredients of the formulations Rl to R4 and R7 were homogeneously mixed in the order given at room temperature with stirring. The fatty acids were placed in a container and heated to 80 ° C. Glycerin and, if appropriate, sodium or potassium hydroxide solution were added in portions, with stirring, the mass becoming homogeneous. After adding the remaining water, the mixture was allowed to cool and the perfume oil was metered in.

It turned out that

*** The creams R1 to R4 according to the invention could easily be produced with a simple stirrer, while the comparative formulations R5 and R6 produced a highly viscous, viscous mass which could only be used using special stirring and homogenizing devices and was producible with great expenditure of energy;

*** The creams R1 to R4 according to the invention had a significantly higher base foam and greater foam stability than the comparative formulations R5 and R6 (see Table 2);

*** The creams Rl to R4 according to the invention had significantly better skin cosmetic tolerance than the comparative formulations R5 to R7; and *** The creams R1 to R4 according to the invention were still easily deformable even at 45 ° C., while the comparative formulas R5 to R7 had set in cement-like form even at significantly lower temperatures (see Table 3). Easily deformable is understood to mean that a shaving cream can easily be pressed out of a tube by hand.

Tab. 1: Composition of the shaving preparations in% by weight

The formulas Rl to R4 are according to the invention, the formulas R5 to R7 are used for comparison. Ha. Foam lines

The foaming power of the recipes was determined using the whipped foam method according to DIN 53 902, Part B. The results on base foam and foam disintegration are summarized in Table 2.

Tab. 2: Foaming power

Hb. Deformability

Tab. 3: Deformability

Note: While homogeneous creams with a beautiful luster were obtained in the examples according to the invention, which were easily deformable in the entire temperature range from 20 to 45 ° C., the comparison formulations had serious deficiencies: the compositions according to R5 and R6 were of dull appearance and very firm, the composition according to R7 very thin and inhomogeneous (phase separation).

Claims

claims

1. Containing mild aqueous shaving preparations

a) 30-70 wt .-% alkyl and / or alkenyl oligoglycosides; b) 10-40 wt .-% fatty acid monoglyceride sulfates and c) 15-35 wt .-% polyols with 3 to 6 carbon atoms and 2 to 6 hydroxyl groups

- each based on the active substance content of the preparations - and, if appropriate, other customary auxiliaries and additives.

2. Mild aqueous shaving preparations according to claim 1, characterized in that alkyl and alkenyl oligoglycosides of the formula (I) are used,

_R l-0- [G] _p - ¹ )

in which R ^{1 represents} alkyl and / or alkenyl radicals having 6 to 22 carbon atoms, G represents a sugar radical having 5 or 6 carbon atoms and p represents numbers from 1 to 10.

3. Mild aqueous shaving preparations according to claims 1 and 2, characterized in that fatty acid monoglyceride sulfates of the formula (II) are used. CH2O-COR ²

I.

CH-OH (II)

I CH2O-SO3X

in which R ² CO represents an aliphatic acyl radical having 6 to 22 carbon atoms and 0 and / or 1 to 3 double bonds and X represents alkali metal and / or alkaline earth metal, ammonium, alkylaramonium or alkanolammonium.

4. Mild aqueous shaving preparations according to claims 1 to 3, characterized in that glycerol is used as the polyol.

5. Use of mixtures containing

- each based on the active substance content of the preparations - and, if appropriate, other customary auxiliaries and additives for the preparation of mild aqueous shaving preparations.