WO1995011004A1

WO1995011004A1 - A personal care composition

Info

Publication number: WO1995011004A1
Application number: PCT/EP1994/003432
Authority: WO
Inventors: Lars Persson; Hazel Pool
Original assignee: Berol Nobel Ab
Priority date: 1993-10-22
Filing date: 1994-10-17
Publication date: 1995-04-27
Also published as: EP0737061A1; SE9303481D0; SE9303481L; JPH09504017A

Abstract

The invention relates to a personal care composition in liquid or gel form for use as a shower product. The composition which contains two amphoteric compounds with hydrocarbon groups of different sizes, an ethoxylated amide and a water-soluble anionic surfactant, imparts an excellent mild and silky feel to the skin.

Description

A PERSONAL CARE COMPOSITION

The present invention relates to a personal care composition in liquid or gel form suitable for use as a shower product. The composition of the invention imparts an excellent skin feel.

It is desired that personal care products, like shower creams and shower gels, besides a cleaning effect, also provide a mild and silky feel to the skin both at the time of appli- cation and after the use. The products shall also provide a foam of high volume and good texture to facilitate the appli¬ cation of the product on the skin e.g. by a sponge.

In the prior art a number of a personal care products is known. For examples, in EP-A1-523 127 and EP-A1-417 501, clea- ning products for personal care are disclosed, that contain an anionic surfactant and a betaine. However, the betaines may cause irritation in the eyes and have a low contribution to a mild silky skin feel. A skin cleaning mousse-forming product is also described in EP-B1-194 097. The product contains a nonsoap surfactant such as a sulfonate, a sulfate or a betaine, and a moisturizer. In order to obtain an acceptable skin feel a specific skin feel aid is added.

One object of the present invention is to provide a mild personal care product with a smooth and silky feel at the time of application as well as after the use. Furthermore the level of foam volume shall be high. Another object is to obtain acceptable skin feel and foaming properties without the need of using amphoteric quarternized ammonium compounds, like betaines, and skin feel aids. According to the present invention it has been found that these objects may be met by a personal care composition comprising a) a combination of amphoteric compounds containing i) at least one amphoteric compound, which has the formula Rι(CO)_n-[N-(CH₂)_x]_y-N-Q (I) B B wherein R_x is a hydrocarbon group of from 15 to 22 carbon atoms, n is 0 or 1, x is 2 or 3, y is an integer of 0 to 4, Q is CH₂COOM or CH₂CH₂COOM, wherein M is hy¬ drogen or an ion from the groups of alkali metals, ammonium or substitued ammonium and B is hydrogen, an hydroxyalkyl group with 2-3 carbon atoms or a group Q as defined; ii) at least one amphoteric compound, which has the formula R₂(CO)_n-[N-(CH₂)_x]_y-N-Q (II) B B wherein R₂ is a hydrocarbon group of from 7 to 14 carbon atoms, and n, x, y, Q and B have the same meanings as in formula (I) , the weight ratio between the amphoteric compounds with formula (I) and the amphoteric compounds with formula (II) being 1:3-6:1, b) at least one alkoxylated amide, which has the formula R₃NHR₅(A)_nH (HI) wherein R₃ is an acyl group with 15-22 carbon atoms, R₅ is an alkylene oxy group with 2-4 carbon atoms, A is an alkyleneoxy group with 2-3 carbon atoms and n is a number from 0 to 6, or at least one alkoxylated amide, which has the formula

R₄NHR₅(A)_nH (IV) wherein R₄ is an acyl group with 7-14 carbon atoms and R₅, A and n have the same meanings as in formula (III) , or a combination thereof, and c) a water soluble anionic surface active agent, the amounts of component a) , b) and c) being 5-50%, 5-40% and 45-90%, based on the total weight of a) , b) and c) respec¬ tively, and the total amount of a) , b) and c) being 1-100% based on the total weight of the composition. Preferably, the component a) is 10-35%, component b) 10-25% and component c) 50-80% by weight based on the total amount of a) , b) and c) . The weight ratio between component a) and component c) is suitably from 2:3 to 1:8 and the weight ratio between component b) and component c) is from 1:2 to 1:8. In a preferred em- bodyment the composition contain at least one alkoxylated amide with the formula (III) and at least one alkoxylated amide with the formula (IV) , the weight ratio between the compounds with formula III and the compounds with formula (IV) being from 1:6 to 6:1. By combining the compounds of the present composition in the specified amount stated above, it is possible to obtain synergistic properties which make the composition extremely suitable to be used in personal care products, such as shower gels and shower creams.

A blend of these surfactants enables the manufacture of shower products with outstanding performance, especially with regard to after-use skin feel. It is the surfactants alone ^' which are responsible for the skin feel and there is no need to add polymeric material or other emollients in order to achieve an exceptional after-use feel.

Besides the anionic surfactant, the amphoteric compounds with the formulae (I) and (II) also contribute to the cleaning effect of the composition. In addition, the compounds with formula (I) promote the feel of foam and the after-use feel, while compounds with formula (II) generally promote foaming. The alkoxylated amides of formula (IV) increases the volume of foam, while the compounds of formula (III) have a thickening effect in combination with an improved after-use feel and a creamy texture of the foam. Furthermore, any expected toxic effects or skin irritaitons due to the presence of the anionic surfactant are essentially lowered depending on the substantial amounts of amphoteric compounds and alkoxylated amides in the composition.

In^"the formulae (I) and (II), i and R₂ are preferably aliphatic groups, R_x containing 16-20, mainly 18 carbon atoms and R₂ 10-14, mainly 12 carbon atoms. The groups R} and R₂ can be both unsaturated and saturated and suitably they are derived from rapeseed oil and coconut oil.

One class of preferred ampholytic compounds with formu¬ lae (I) and (II) are those where x is 3, n is 0, y is 2-3 and B is the group Q. Another class of suitable amphoteric compounds with formulae (I) and (II) are those where n is 1, and each B independently of each other hydrogen, a hydroxyalkyl group with 2-3 carbon atoms or the Q group with the proviso that at least one of the B groups is the hydroxyalkyl group. Examples of such compounds are those with the formulae R-C(O)-N-CH₂CH₂-N-CH₂COOM (V) CH₂CH₂OH CH₂COOM and

R-C(0)-N-CH₂CH₂-N-CH₂COOM (VI) H CH₂CH₂OH where M has the same meaning as mentioned above and R is R_: or R₂ where R_λ and R₂ have the same meanings as mentioned above. In addition to the amphoteric surfactants of formulae (I) and (II) the composition may also contain other types of amphoteric compounds as well as zwitterionic compounds like betaines. Examples of suitable zwitterionic compounds are those with the formula CH₃ R_a-N⁺-(CH₂)_mCOOM (V) CH₃ wherein R_a is a hydrocarbyl chain of 7-21 carbon atoms and preferably is an alkyl or alkenyl radical of from 11 to 17 carbon atoms; m is 1 or 2; M is preferably H or sodium ion. Preferred alkoxylated amides with the formulae (III) and (IV) are those, where n is a number from 0 to 4, most preferably from 2-3, and R₃ is an acyl group with 16-20, mainly 18 carbon atoms and R- is an acyl group with 10-14, mainly 12 carbon atoms. Preferably at least 50 % of all A groups are the ethyleneoxy group, and most preferably both R₅ and A are ethyleneoxy groups. The R₃ and R₄ groups are suitably derived from rapeseed oil and coconut oil.

Anionic surfactants suitable for inclusion in the com- positions are those generally used in personal care products and include alkylsulfates, ethoxylated alkyl sulfates, alkyl polyglucoside sulfates, fatty acid polyglyceride sulfates, fatty acylamido polyoxyethylene sulfate, alkyl glyceryl ether sulfonates, methyl acyl taurates, fatty acyl glycinates, N-acyl glutamates, acyl isethionates, alkyl sulfosuccinates, alpha- sulfonated fatty acids, their salts and/or their esters, alkyl phosphate esters, ethoxylated alkyl phosphate esters, acyl sarcosinates and fatty acid/protein condensates, and mixtures thereof. The alkyl and/or acyl groups for these surfactants contain 8-22, preferably 10-18 carbon atoms.

Preferred from the viewpoint of optimum characteristics for shower products are the sulfate compounds, especially the salts of sulfuric acid esters of the reaction product of 1 mole of a higher fatty alcohol with 10-18 carbon atoms and from about 1 to about 5 moles of ethylene oxide, with sodium, ammonium or magnesium being the preferred counterions. Particu- lary preferred are the alkyl ether sulfates containing from about 2 to 4 moles of ethylene oxide, such as sodium lauryl dioxyethylene sulfate, sodium lauryl trioxyethylene sulfate. In addition to the above components the composition of the invention may also contain normally used components, such as preservatives, pearlescent agents, opacifiers, colourants and fragrance. Preservatives may e.g. include Euxyl K 100 (Sch lke and Mayr), benzyl alcohol, metylchloroisothiazolinone and methylisothiazolinone. The pearlescent agent may e.g. be Empicol XP40 (Albright & Wilson) . Opacifiers may suitably be polymeric substances, such as copolymers of vinyl pyrrolidone and styrene. The colourants may e.g. include FDC Yellow and FDC Orange 4.

The pH of the composition should be within a range of 4.5 to 7.0, and preferably 5.5. A pH adjusting agent can be used, such as an organic acid, e.g. citric or lactic acid, or an inorganic acid, e.g. hydrochloric acid.

The invention is further ilustrated by means of the following examples.

Example 1

A number of compositions were prepared from an anionic surfactant, amphoteric surfactants and amide etoxylates. The compounds used are as set forth in the following table.

Table 1

Compound nr Chemical structure

A Formula I, where R_λ is a C₁₆_₁₈ aliphatic group, x and y is 3, n is 0, and B and Q are

C₂H₄COONa

B Formula II, where R₂ is a C₁₂_ι aliphatic group, x is 3, y is 2, n is 0, and B and Q are

C₂H₄COONa

C Formula III, where R₃ is a C₁₆_₁₈ aliphatic group; R₅=A=C₂H₄0; and n=2

D Formula IV, where R₄ is an C₁₂_₁₄ aliphatic group; R₅=A=C₂H₄0; and n=2

E Lauryl di(oxyethylene)sulphate

By using these surfactant A-E the following compositions were formulated.

Table 2

Formulation Ingredient % by weight

1 B 3

C 2

E 15

2 A 3

C 2

E 15

3 A 1.5

B 1.5

C 2

E 15

4 B 3

D 4

E 15

5 A 3

D 3

E 15

6 A 1.5

B 1.5

D 3

E 15

7 A 1.5

B 1.5

C 2

D 3

E 15

The seven formulations were evaluated with regard to volume of foam, feel of foam on application and the after-use feel of skin. These parameters were in accordance with scales from 0 to 100 having the following meanings. Volume of foam 0 = None 100 = Copious

Feel of foam 0 = Unacceptable 100 = Extremely rich

After-use feel 0 = Unacceptable 100 = Excellent

The assessments were carried out on the forearms, which were prewashed with mild Palmolive soap, and wetted with warm water, before applying the test formulations.

A quantity of 0.5 g of the formulations was transferred to the arm, and the arm was then rubbed five times initially, and then up to a further twenty times. Each time the volume of foam and the feel of the foam on the skin were recorded.

The arms were then rinsed with warm water and dried using a clean towel. The after-feel was recorded after five minutes. The following results were obtained.

Formulation Foam Volume Feel of foam After-use feel

1 67.5 67.5 82.5

2 67.5 67.5 82.5

3 70 72.5 82.5

4 67.5 67.5 72.5

5 70 72.5 77.5

6 75 72.5 77.5

7 75 72.5 85

From the results it is evident that formulation 3, 6 and 7 in accordance with the invention exhibits advantageous and synergistic effects in comparison with the formulations 1, 2, 4 and 5.

Example 2

A shower cream composition based on formulation 7 was compared with three shower products on the commercial market with regard to the volume of foam, feel of foam and after-use feel.

The composition of the shower cream was as follows.

Components % by weight

A 1.5

B 1.5

C 2.0

D 3.0

E 15

Vinyl pyrrolidone/styren copolymer (Antara

430) 1.5

Propylenglycol 2.0

Preservative (Euxyl K 100) 0.1

Perfume (Frequent K/25952) 0.3

Water up to 100 %

The pH-value of the shower cream was adjusted to 5.3 by adding citric acid. After this addition the shower cream had an viscosity of 16 000 cps.

The following results were obtained.

Product Foam Volume Feel of foam After-use feel

Shower cream of the invention 75 72.5 85

Comparison 1 75 70 82.5

Comparison 2 70 70 67.5

Comparison 3 75 75 80

From the results it is evident that the shower cream product in accordance with the invention gives an exceptional after-use feel without the need of vegetable oils or synthetic emollient materials. Example 3

The following formulations were prepared.

Components Formulation, % by weight

8 9 10

A - 1.5 1.5

A' 1.5 - -

B 1.5 1.5 -

B' - - 1.5

C 2.0 - 2.0

C^« - 2.0 -

D 3.0 - 3.0

D¹ - 3.0 -

E 15.0 15.0 15.0

A¹ = Formula (I), where R_x(CO)_n=C₁₆_₁₈ acyl group; x=2; y=3; B=Q=CH₂COONa

B' = Mixture of Formula (V) and (VII), where R(CO)=C₁₂_₁₄ acyl C = Formula (III) , where R₃=C₁₆__1Θ aliphatic group; R₅=C₂H₄0; A=C₂H₄0; and n=3

D' = Formula (III) , where R₃-=C₁₂_₁₄ aliphatic group; R₅=C₂H₄0; and n=0

Compounds A, B, C, D and E were the same as in Example 1. The formulations 8, 9 and 10 were then tested in the same manner as in Example 1. The same results as for formulation 7 in Example 1 were obtained, but with the exception that Feel of Foam for formulations 8 and 9 was 75. The formulation 9 had also a slightly higher viscosity than formulations 7, 8 and 10.

Claims

1. A personal care composition comprising a) a combination of amphoteric compounds containing i) at least one amphoteric compound, which has the formula Rι(CO)_n-[^-(CH₂)_x]_y-N-Q (I)

B B wherein R_x is a hydrocarbon group of from 15 to 22 carbon atoms, n is 0 or 1, x is 2 or 3, y is an integer of 0 to 4, Q is CH₂COOM or CH₂CH₂COOM, wherein M is hy- drogen or an ion from the groups of alkali metals, ammonium or substitued ammonium and B is hydrogen, an hydroxyalkyl group with 2-3 carbon atoms or a group Q as defined; ii) at least one amphoteric compound, which has the formula R₂(CO)_n-[N-(CH₂)_x]_y-N-Q (II)

B B wherein R₂ is a hydrocarbon group of from 7 to 14 carbon atoms, and n, x, y, Q and B have the same meanings as in formula (I) , the weight ratio between the amphoteric compounds with formula (I) and the amphoteric compounds with formula (II) being 1:3-6:1, b) at least one alkoxylated amide, which has the formula

R₃NHR₅(A)_nH (III) wherein R₃ is an acyl group with 15-22 carbon atoms, R₅ is an alkylene oxy group with 2-4 carbon atoms, A is an alkyleneoxy group with 2-3 carbon atoms and n is a number from 0 to 6, or at least one alkoxylated amide, which has the formula

R₄NHR₅ (A) _nH ( IV) wherein R₄ is an acyl group with 7-14 carbon atoms and

R₅, A and n have the same meanings as in formula (III), or a combination thereof, and c) a water soluble anionic surface active agent, the amounts of component a) , b) and c) being 5-50%, 5-40% and 45-90%, based on the total amount of a), b) and c) respec¬ tively, and the total amount of a) , b) and c) being 1-100% based on the total amount of the composition.

2. A composition in accordance with claim 1, characterized in that in formulae (I) and (II) R_λ is an aliphatic group with 16-20 carbon atoms and R₂ is an aliphatic group with 10-14 carbon atoms.

3. A composition in accordance with claim 2, characterized in that n is 1.

4. A composition in accordance with claim 1 or 2, characterized in that x is 3, n is 0 and B is the group Q.

5. A composition in accordance with any one of claims 1-4, characterized in that it contains at least one compound with the formula (III) and at least one compound with the formula (IV) in a weight ratio of 1:6 to 6:1.

6. A composition in accordance with any one of claims 1-5, characterized in that in formulae (III) and (IV) R₃ is an ali- phatic group with 16-20 carbon atoms and R₄ is an aliphatic group with 10-14 carbon atoms.

7. A composition in accordance with claim 6, characterized in that R₅ and A are ethyleneoxy groups.

8. A composition in accordance with any one of claims 1-7, characterized in that the anionic surfactant is a sulphate or sulphonate.

9. A composition in accordance with claim 8, characterized in that the anionic surfactant is a salt of sulfuric ester of the reaction product of 1 mole of a fatty alcohol and from 1 to 5 moles of ethylene oxide.

10. A composition in accordance with any one of claims 1-9, characterized in that the component a) is 10-35 %, component b) 10-25 %, and component c) 50-80 %, based on the total weight of components a) , b) , and c) .

11. Use of a composition in accordance with any one of claims 1-10 in the formulation of a shower product.