Cosmetic composition comprising at least one alkoxysilane

Abstract

The present invention relates to a cosmetic or dermatological composition of sol/gel type for making up and/or caring for keratin materials characterized in that it comprises the product resulting from the reaction: (a) of at least one alkoxysilane monomer or oligomer of formula (I) R1xSi(OR2)(4-x) or of formula (II) [R1y (OR2)z SiO ((4--)/2)] in which R1 represents, independently, a nucleophilic group other than a hydroxyl, or a (Ci-C2o)alkyl group, R2 represents, independently, a (Ci-Cio)alkyl group, and (b) of an amount of water corresponding to a number of moles of water, determined according to the following equation: X(llAlkoxysilanesllbAlkoxy groups)/nH2o with nH2o=Number of moles of water, nAikoxysiianes=Number of moles of alkoxysilane compounds, nbAikoxy groups=Weighted mean of the number of alkoxysilane groups per alkoxysilane compound, and X is a number greater than 2. It also relates to an associated cosmetic process and an associated kit for coating keratin materials.

Claims

1. A cosmetic or dermatological sol/gel composition remaining in liquid form before application to keratin materials, the composition comprising a product resulting from the reaction: (a) of 3-aminopropyltriethoxysilane (APTES) with methyltriethoxysilane (MTES), and (b) of an amount of water corresponding to a number of moles of water, determined according to the following equation:
X=(n.sub.Alkoxysilanesnb.sub.Alkoxy groups)/n.sub.H2O with: n.sub.H2O=Number of moles of water, n.sub.Alkoxysilanes=Number of moles of alkoxysilane compounds, nb.sub.Alkoxy groups=Weighted mean of the number of alkoxysilane groups per alkoxysilane compound, and X is a number of 3-4.11.

2. The composition of claim 1, further comprising at least one member selected from the group consisting of (c), (e), (f) and (g): (c) an acid and/or a base; (e) a film-forming polymer; (f) a reactive additive comprising a hydroxyl function; and (g) a solvent or a mixture of solvents.

3. The composition of claim 2, comprising more than 25% by weight of the sum of the product resulting from the reaction of (a) and (b), and of the optional compounds (c) and (e).

4. The composition of claim 1, further comprising at least one cosmetic or dermatological active agent selected from the group consisting of film-forming polymers, plasticizers, pigments, nacres, dyes, vitamins, trace elements, softeners, sequestrants, wetting agents, thickeners, dispersants, antifoams, spreading agents, co-resins, plasticizers, fillers, coalescers, preserving agents, UV-screening agents, active agents, moisturizers, neutralizers, stabilizers and antioxidants.

5. The composition of claim 1, which is a nail varnish, a varnish base, a nailcare product, a liquid lipstick, a foundation, or a haircare composition.

6. A cosmetic process for coating a keratin materials material, comprising applying to said keratin material at least one coat of the cosmetic composition of claim 1.

Description

EXAMPLE 1

MTES/TEOS/APTES System

(1) In a plastic flask, 7.37 g of a 0.1M aqueous HCl solution are added to a mixture of 16.22 g of MTES (M=178.3 g/mol) and 66.34 g of TEOS (M=208.33 g/mol). The alkoxysilane monomers and the 0.1 M HCl solution are stirred vigorously using a magnetic stirrer until a clear solution is obtained. 10 minutes after the solution becomes clear, 10.07 g of APTES (M=221.37 g/mol) are added to the mixture. After one hour of stirring, the solution is placed in an incubator at 60 C. for 24 h. The solution is then diluted with 175 g of absolute ethanol. n.sub.H2O=0.41
X=(n.sub.Alkoxysilanesnb.sub.Alkoxy groups)/n.sub.H2O=4.11

(2) Films are spread on a contrast card. After 10 to 15 min, a shiny transparent film is obtained. The final solution does not gel over time.

EXAMPLE 2

MTES/TEOS/APTES System+Ethylcellulose

(3) In a plastic flask, 7.37 g of 0.1 M HCl are added to a mixture of 16.22 g of MTES and 66.34 g of TEOS. The alkoxysilane monomers and the 0.1 M HCl solution are stirred vigorously using a magnetic stirrer until a clear solution is obtained. 10 minutes after the solution becomes clear, 10.07 g of APTES are added to the mixture. After one hour of stirring, the solution is placed in an incubator at 60 C. for 24 h. A mixture of 55 g of ethylcellulose (Ethocell Standard 45 Premium from Dow Chemical), 55 g of ethyl acetate and 110 g of absolute ethanol are then added to the alkoxysilane solution at ambient temperature. n.sub.H2O=0.41
X=(n.sub.Alkoxysilanesnb.sub.Alkoxy groups)/n.sub.H2O=4.11

(4) Films are spread on a contrast card. After 10 to 15 min, a shiny transparent film is obtained. The final solution does not gel over time.

EXAMPLE 3

N-Cyclohexylaminomethyltriethoxysilane Homooligomer System

(5) In a plastic flask, 6.13 g of ultrapure water are added to 93.87 g of N-cyclohexylaminomethyltriethoxysilane (M=275.46 g/mol). The alkoxysilane monomers and the ultrapure water are stirred vigorously using a magnetic stirrer. After one hour of stirring, the solution is placed in an incubator at 60 C. for 24 h. n.sub.H2O=0.34
X=(n.sub.Alkoxysilanesnb.sub.Alkoxy groups)/n.sub.H2O=3

(6) Films are spread on a contrast card. After 15 to 20 min, a shiny transparent film is obtained. The final solution does not gel over time.

EXAMPLE 4

MTES/Acetoxymethyltriethoxysilane/APTES System

(7) In a plastic flask, 7.85 g of 0.1 M HCl are added to 69.1 g of MTES. The alkoxysilane monomers and the 0.1 M HCl solution are stirred vigorously using a magnetic stirrer until a clear solution is obtained. 10 minutes after the solution becomes clear, 11.45 g of acetoxymethyltriethoxysilane (M=236.34 g/mol), 10.72 g of APTES and 0.87 g of pure water are added to the mixture. After one hour of stirring, the solution is placed in an incubator at 60 C. for 24 h. n.sub.H2O=0.48
X=(n.sub.Alkoxysilanesnb.sub.Alkoxy groups)/n.sub.H2O=3

(8) Films are spread on a contrast card. After 15 to 20 min, a shiny transparent film is obtained. The final solution does not gel over time.

EXAMPLE 5

(Comparative): MTES/APTES System

(9) In a plastic flask, 24.99 g of 0.1 M HCl are added to a mixture of 61.89 g of MTES. The alkoxysilane monomers and the 0.1 M HCl solution are stirred vigorously using a magnetic stirrer until a clear solution is obtained. 10 minutes after the solution becomes clear, 25.61 g of APTES are added to the mixture. n.sub.H2O=1.39 X=1

(10) After stirring for 30 minutes, the solution is gelled.