CA2231080A1 - Concentrated solutions of a 1,3,5-triazine derivative sunscreen and their use for the preparation of cosmetic compositions - Google Patents
Concentrated solutions of a 1,3,5-triazine derivative sunscreen and their use for the preparation of cosmetic compositions Download PDFInfo
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- CA2231080A1 CA2231080A1 CA002231080A CA2231080A CA2231080A1 CA 2231080 A1 CA2231080 A1 CA 2231080A1 CA 002231080 A CA002231080 A CA 002231080A CA 2231080 A CA2231080 A CA 2231080A CA 2231080 A1 CA2231080 A1 CA 2231080A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q5/00—Preparations for care of the hair
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/53—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with three nitrogens as the only ring hetero atoms, e.g. chlorazanil, melamine
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
- A61K8/37—Esters of carboxylic acids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/49—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
- A61K8/494—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with more than one nitrogen as the only hetero atom
- A61K8/4966—Triazines or their condensed derivatives
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q1/00—Make-up preparations; Body powders; Preparations for removing make-up
- A61Q1/02—Preparations containing skin colorants, e.g. pigments
- A61Q1/04—Preparations containing skin colorants, e.g. pigments for lips
- A61Q1/06—Lipsticks
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
- A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
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Abstract
It is disclosed a solution consisting of from 15 to 60% by weight of a compound of formula (I) and from 40 to 85% by weight of at least an ester of formula (II) A-(COO-B)n (II) wherein:
n is the number 1 or 2;
A, when n is 1, is a C6-C20 straight or branched alkyl group, phenyl, optionally substituted with one or more C1-C4 straight or branched alkyl groups, hydroxy, C1-C4 straight or branched alkoxy, or when n is 2, A is a saturated or unsaturated C2-C12 alkylene chain, optionally substituted with one or more hydroxy groups or A is a phenylene group, B is a C3-C18 straight or branched alkyl group; C5-C12 cycloalkyl optionally substituted with one or more C1-C4 straight or branched alkyl groups. Said solution is useful for the preparation of sun protecting cosmetic compositions as well as for their stabilization against photoinduced degradation.
n is the number 1 or 2;
A, when n is 1, is a C6-C20 straight or branched alkyl group, phenyl, optionally substituted with one or more C1-C4 straight or branched alkyl groups, hydroxy, C1-C4 straight or branched alkoxy, or when n is 2, A is a saturated or unsaturated C2-C12 alkylene chain, optionally substituted with one or more hydroxy groups or A is a phenylene group, B is a C3-C18 straight or branched alkyl group; C5-C12 cycloalkyl optionally substituted with one or more C1-C4 straight or branched alkyl groups. Said solution is useful for the preparation of sun protecting cosmetic compositions as well as for their stabilization against photoinduced degradation.
Description
The present invention relates to concentrated solutions of lipophilic suncreens derivatives of 1,3,5-triazine and in particular to a method for their solubilization in solvents suitable for the preparation of cosmetic compositions.
Background of the invention It is well known that sun radiations ranging from 290 to 400 nm are noxious to organic materials, among which cutaneous tissue too. In fact, continuous exposition to sun radiations is considered the main cause of the development of degenerative processes and of skin cancer forms.
In particular, radiations with a wavelength between 290 and 320 nm, so-called UV-B radiations, are the cause of erythema and sunburns, whose severity depends on the duration of exposition.
By means of the use of particular compounds, so called sunscreens, which are capable of absorb, at least partially, sunlight UV radiations, or of formulations containing these compounds it is possible to avoid or at least attenuate the noxious effects and slow down human skin ageing.
As protective agents, a number of substances have been studied and tested and with regard to this a wide patent literature exists, disclosing several compounds, belonging to different chemical classes and capable of absorbing in the UV range of sun radiation, particularli~
Background of the invention It is well known that sun radiations ranging from 290 to 400 nm are noxious to organic materials, among which cutaneous tissue too. In fact, continuous exposition to sun radiations is considered the main cause of the development of degenerative processes and of skin cancer forms.
In particular, radiations with a wavelength between 290 and 320 nm, so-called UV-B radiations, are the cause of erythema and sunburns, whose severity depends on the duration of exposition.
By means of the use of particular compounds, so called sunscreens, which are capable of absorb, at least partially, sunlight UV radiations, or of formulations containing these compounds it is possible to avoid or at least attenuate the noxious effects and slow down human skin ageing.
As protective agents, a number of substances have been studied and tested and with regard to this a wide patent literature exists, disclosing several compounds, belonging to different chemical classes and capable of absorbing in the UV range of sun radiation, particularli~
in that comprised between 290 and 390 nm.
For the protection of the skin from sunburns and erythema caused by UV-8 radiation, different compounds, such as for examgle derivatives of cinnamic acid, 4-aminobenzoic acid, benzylidencamphor, benzophenone, diphenylcyanoacrylic acid, s-triazine are known, and widely used in cosmetic compositions.
Among the derivatives of s-triazine, particularly interesting are the suncreens described in the US Patent 1 10 n. 5,346,691. In fact, these compounds, other than a high extinction coefficient in UV-B, therefore an optimal efficacy, show also a very high solubility in most of the solvents used in cosmetics for the preparation of sunscreen compositions.
For the photoprotection of the skin, many compositions. have been proposed, and also with regard to this a vast patent literature exists.
Very often, these sunscreen compositions are in the form of an oil-in-water emulsion containing, in variable concentrations, one or more lipophilic and/or hydrophilic organic sunscreens, capable of absorbing more or less intensely sunlight UV radiations.
The kinds of sunscreens and the amounts for their use are selected depending on the desired sun protecting factor (SPF). SPF is an index of protection and is expressed as the ratio between the time of irradiation necessary to reach the erythematogenic threshold in the presence of the UV filter and the time necessary to reach the erythematogenic threshold in the absence of the UV filter. SPF can be determined according to the method described by B. Diffey and J. Robson in J. Soc.
,. CA 02231080 1998-03-04 Cosmet. Chem. 40, 127-133 (1989).
Among the sunscreens described in US 5,346,691, particularly suitable for the use in the preparation of sunscreen composition is. the compound of the following formula (I):
~ 2H5 NH ~ COOCH2-CH-C4H9 N
(CH3)3C-NH -CO ~ ~ ~ O N
N
NH ~ COOCH2-CH-C4H9 (I) This compound is in the form of a white solid, it has a very high activity in UV-H and has a very high solubility in the solvents commonly used in the formulation of sunscreen compositions.
Some cosmetics manufacturers find some drawbacks in using the solid form of the sunscreen. These drawbacks consists in the troublesome handling of a powder, in the operation of dissolving it in a suitable solvent and in the time necessary for this operation.
Abstract of the invention It has now surprisingly been found that the above drawbacks can be avoided when the compound of formula (I) is provided in the form of a liquid concentrated solution in one or more solvents selected from the group consisting of esters of carboxylic acids.
It is an object of the present invention a solution consisting of from 15 to 60% by weight of a compound of formula (I) ~2H5 , N
t CH3 ) 3C -NH ~CO O ~ ~ ~ N
p ~NS COOCH -CH-C H
(I) 2 i 4 9 and from 40 to 85% by weight of a solvent consisting of at least an ester of formula (II) A-(COO-B)n (II) wherein:
n is the number 1 or 2;
A, when n is 1, is a C6-C20 straight or branched alkyl group, phenyl optionally substituted with one or more C1-C4 straight or branched alkyl groups, hydroxy, C1-C4 straight or branched alkoxy, or when n is 2, A is a C2-C12 saturated or unsaturated alkylene chain, optionally substituted with one or more hydroxy groups or A is a phenylene group;
B is a C3-C18 straight or branched alkyl group; C5-C12 cycloalkyl optionally substituted with one or more C1-C4 straight or branched alkyl groups.
It is another object of the present invention a method for the preparation of said solution.
It is a further object of the present invention a method for the preparation of sun protecting cosmetic compositions comprising the addition of said solution to a cosmetic substrate. The cosmetic compositions containing said solution are also an object of the present invention.
These and other objects of the present invention will be disclosed in detail in the following disclosure and examples.
DPta_,'_1_ed disclosure of the invention According to the present invention, examples of C6 5 C20 straight or branched alkyl are hexyl, heptyl, octyl, dodecyl, tetradecyl, hexadecyl, octadecyl and their isomers, in particular 2-ethylpentyl, heptadecyl, pentadecyl, tridecyl are preferred.
Examples of C2-C12 alkylene chain are ethylene, trimethylene, tetramethylene, hexamethylene, decame thylene, in particular 1-hydroxyethylene and ethene is preferred.
Examples of optionally substituted phenyl ~ are phenyl, toluyl, xylyl, trimethylphenyl, ethylphenyl, isopropylphenyl, terbutylphenyl, hydroxyphenyl, methoxy phenyl, ethoxyphenyl, propoxyphenyl, butoxyphenyl, and their isomers, in particular phenyl and 2-hydroxyphenyl are preferred.
Examples of C3-C1$ straight or branched alkyl are propyl, butyl, pentyl, hexyl, octyl, decyl, tridecyl, pentadecyl, hexadecyl, octadecyl and their isomers.
Examples of cycloalkyl are cyclopentyl, cyclohexyl, 4-ter-butylcyclohexyl, menthyl.
Preferred solvents of formula (II) are: 2 ethylhexyl 2-ethylhexanoate, 2-ethylhexyl stearate,~ 2 ethylhexyl palmitate, bis(2-ethylhexyl) malate, isopropyl myristate, isopropyl palmitate, C12-C15 alkyl benzoate, menthyl salicylate, 2-ethylhexyl salicylate, bis n-octyl maleate, bis n-octyl fumarate.
In a preferred embodiment of the present invention;
the solution consists of 20-50$ by weight' of the compound of formula (I) and of 80-50$ by weight of at least a solvent of formula (II).
The solution according to the present invention is, so to say, ready for use, of simple dosage and use, since it avoids the handling of the substance in the powdery form and its dissolution; therefore significantly facilitating the task of the cosmetic manufacturer.
According to the present invention it is provided a method for the preparation of the above described solution. Said process comprises the addition of a suitable amount of the compound of formula (I) to the solvent under stirring, at a temperature ranging from 0 to 200°C, preferably from 20 to 180°C.
Alternatively, the solution can be prepared by adding the suitable amount of solvent to the compound of formula (I) in the melted state at a temperature ranging from 110 to 180°C.
The solvents of formula (II) used for the preparation of the solutions according to the present invention are esters of mono- or dicarboxylic acids, commercially available and commonly used and in any case preparable with methods well-known in literature.
The solutions object of the present invention are useful for the preparation of cosmetic compositions.
Such compositions are suitable for the cosmetic treat ment of skin, of hair or make-up in the decorative co smetic. A cosmetic method for tanning, while protecting human skin or hair from ultraviolet radiations consists in applying on the skin or hair a suitable amount of a cosmetic composition containing a solution of the present invention. A suitable amount shall be determined directly by the person using the composition or by an expert suggesting a suitable amount depending on the SPF
of the composition, the kind of skin or hair to be protected and the radiation intensity.
According to the present invention, the cosmetic compositions can be solutions, lotions, emulsions of the water-in-oil or oil-in-water type; or can also be in the form of gels, lipsticks, aerosols.
The compositions according to the present invention are prepared by formulating the ingredients usually employed, such as for example oils, fats; emulsifiers, humectant agents, moisturizing agents, emollients, preservatives, surfactants, thickening agents, perfumes, pigments, dyes and other else such as alcohols, polyols, electrolytes, siliconic derivatives.
The more commonly used solvents are natural or synthetic triglycerides, hydrocarbons, esters of fatty aoids with isopropanol, propylene glycol, glycerin, or fatty alcohols, propylene glycol monomethyl- or monoethyl- or monobutylether, dioctyl malate.
The present invention comprises also a method for the protection of the cosmetic compositions themselves from UV radiation by means of the addition of from 0.2 to 40.0%, preferably from 1 to 30%, by weight with respect to the composition of a photostabilizing mixture consisting of the above solution of the compound of formula (I). In this case it is a matter of compositions whose components can undergo unwanted light-induced degradation or colouring, as for example shampoos and hair lacquers, hair dressing lotions, hair-dyeing compositions, make-up formulations, as nail lacquers, foundation, lipstick. Preferred cosmetic formulations are the ones for the protection of skin from sun radiations. Therefore, also a method for stabilizing a cosmetic composition is a further object of the present invention.
On the other hand, the solution according to the present invention is also useful for the preparation of a composition suitable for the protection of skin from ultraviolet radiations, in particular UV-B, with wavelength ranging from 290 to 320 nm.
The cosmetic compositions of the present invention, other than the above described solution, can also contain other complementary sunscreens and particularly those with a maximum absorption from 320 to 380 nm.
Well-known sunscreens which can be combined with the solution of the present invention are for example: 3-(4-methylbenzylidene)camphor, 2-ethylhexyl (4-dimethylami-no)benzoate, 2-ethylhexyl (4-methoxy)cinnamate, 2-hydro-xy-4-methoxybenzophenone, 2,4,6-trianilino-(p-carbo-2-ethylhexyloxy)-1,3,5-triazine, 4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane, 2-ethylhexyl 2-cyano-3,3-diphe-nylacrylate, salts of 2-phenylbenzimidazol-5-sulfonic acid, salts of 2-hydroxy-4-methoxybenzophenone-5-sulfo-nic acid, 1,4-di(3-methylbenzylidenecamphor-10-sulfonic) acid.
Other than the above described solution, the sun protecting compositions according to the present invention can also contain, inorganic pigments commonly used in cosmetics, such as for example titanium dioxide, zinc oxide, silicon oxide or aluminium oxide.
The solution of the present invention can be used for the preparation of a medicament useful for the protection of human skin or hair when exposed to sunlight UV radiations.
The following examples further illustrate the invention:
Example 1 100 g of compound of formula (I) were added, in a period of 15 minutes and under stirring, to 100 g of bis n-octyl maleate pre-heated to 70°C. Once the addition . was finished, stirring was continued for 5 minutes, then the solution was cooled down to 20°C and discharged, to obtain a pale yellow viscous solution.
Example 2 100 g of compound of formula (I) were added, in a period of 30 minutes and under stirring, to 200 g of C12 C15 alkyl benzoate {Finsolv TN by the firm FINITEX) at room temperature. Once the addition was finished, stirring was continued for 2 hours, then the solution was discharged, to obtain a lightly yellow solution.
Examp~, a 3 120 g of compound of formula (I) were added, in a period of 15 minutes and under stirring, to 80 g of iso-propyl myristate pre-heated to 80°C. Once the addition was finished, stirring was continued for 10 minutes, then the solution was cooled to room temperature and discharged, to obtain a very viscous solution.
Example 4 80 g of compound of formula (I) were added, in a period of 15 minutes and under stirring, to 120 g of menthyl salicylate pre-heated to 50°C. Once the addition was finished, stirring was continued for 30 minutes, then the solution -was cooled to room temperature and discharged, to obtain a very viscous yellowish solution.
Examgle ~
5 A suspension consisting of 200 g of Finsolv TN and 100 g of compound of formula (I) was slowly warmed under stirring to 90°C. Once the temperature of 90°C was reached; stirring was continued for some minutes, then the solution was cooled to room temperature and 10 discharged.
Bxamnle 6, In a period of 5 minutes, 120 g of bis n-octyl maleate were added to 80 g of melted compound of formula (I), heated to 160°C.
Once the addition was finished stirring was continued for some minutes, then the solution was cooled and discharged.
Exam 1R a 7 In a period of 5 minutes, 110 g of a mixture consisting of 60 g of menthyl salicylate and 50 g of isopropyl myristate were added to 90 g of melted compound of formula (I), heated to 160°C. Once the addition was finished stirring was continued for 5 minutes, then the viscous solution was discharged.
Example A - Lotion Solution of Example 1 5.0 g Octyl octanoate 48:0 g Triglycerides C8-C10 34.5 g Dioctylcyclohexane 12.4 g Perfume 0.1 g The mixture was stirred for 10-15 minutes.
Examp],~; B - O/W Sun cream C12-C15 Alkylbenzoate 5.0 g Diisopropyl adipate 5.0 g Shea butter 2.0 g a-Bisabalol 0.5 g 4-methoxy-4'-terbutyldibenzoylmethane 2.5 g Solution of Example 4 10.0 g Stabylen 30 (R) (emulsifing agent by 3V SIGMA) 0.3 g Synthalen K (R) (Thickening agent by 3V SIGMA) 0.3 g Abiol (R) (Preservative by 3V SIGMA) 0.3 g Methylparaben 0.2 g Propylparaben 0.1 g Glycerine 5.0 g Aminomethylpropanol 0.5 g Water up to 100.0 g Perfume The fatty phase was warmed to 70 C, sunscreens were added and stirring was done for 10-15 minutes.
Stabylen and Synthalen K were dispersed in w ater and the fatty phase was added under strong stirring the 70C
to previously warmed aqueous dispersio n. The resulting mixture was neutralized with aminomethylpropanol, cooled 25 to 35C and preservatives, glycerine and perfume were added.
C
O/
D
l $xamp - 4.0 g ay-cream e W
Triglyceryl methylglucose distearate Glyceryl stearate 1.0 g 30 C12-C15 Alkylbenzoate 7.5 g Avocado oil 5.0 g Diisopropyl adipate 5.0 g Solution of Example 3 3.0 g 2-hydroxy-4-methoxybenzophenone 2.0 g Synthalen K (Thickening agent by 3V SIGMA) 0.2 g Abiol {R) (Preservative by 3V SIGMA) 0.3 g Methylparaben 0.2 g Propylparaben 0.1 g Aminomethylpropanol 0.15 g Glycerine 3.0 g Water up to 100.0 g Perfume Operations were performed as described in Example B.
~.xample D - 0/W Sun milk PEG-7 Hydrogenated castor oil 7.5 g Lanolin Alcohols in mineral oil 2.5 g Octyl octanoate 7.5 g Dioctylcyclohexane S.O g Cetylstearyl octanoate 5.0 g Solution of Example 1 6.0 g Abiol (R) (Preservative by 3V SIGMA) 0.3 g Glycerine 5.0 g Water up to 100.0 g Perfume The fatty phase was warmed to 70°C and the sunscreens were added.
70°C pre-heated water was added to the fatty phase under strong stirring. After cooling, preservative;
glycerine and perfume were added.
Exam~gle B - Lipstick The base mixture was first prepared:
Beeswax 13.0 g Carnauba wax 7.5 g Lanolin 5:0 g Isopropyl myristate 8.0 g Mineral oil 3.0 g Castor oil 63.5 g - 85 g of this mixture were warmed to melt . 20 g of the solution of example 2 and 7 g of 4-methoxy-4' terbutyldibenzoylmethane as well as perfume and dyes were added to the molten mass, then it was diluted to 1000 g with castor oil and it was cooled at room temperature.
For the protection of the skin from sunburns and erythema caused by UV-8 radiation, different compounds, such as for examgle derivatives of cinnamic acid, 4-aminobenzoic acid, benzylidencamphor, benzophenone, diphenylcyanoacrylic acid, s-triazine are known, and widely used in cosmetic compositions.
Among the derivatives of s-triazine, particularly interesting are the suncreens described in the US Patent 1 10 n. 5,346,691. In fact, these compounds, other than a high extinction coefficient in UV-B, therefore an optimal efficacy, show also a very high solubility in most of the solvents used in cosmetics for the preparation of sunscreen compositions.
For the photoprotection of the skin, many compositions. have been proposed, and also with regard to this a vast patent literature exists.
Very often, these sunscreen compositions are in the form of an oil-in-water emulsion containing, in variable concentrations, one or more lipophilic and/or hydrophilic organic sunscreens, capable of absorbing more or less intensely sunlight UV radiations.
The kinds of sunscreens and the amounts for their use are selected depending on the desired sun protecting factor (SPF). SPF is an index of protection and is expressed as the ratio between the time of irradiation necessary to reach the erythematogenic threshold in the presence of the UV filter and the time necessary to reach the erythematogenic threshold in the absence of the UV filter. SPF can be determined according to the method described by B. Diffey and J. Robson in J. Soc.
,. CA 02231080 1998-03-04 Cosmet. Chem. 40, 127-133 (1989).
Among the sunscreens described in US 5,346,691, particularly suitable for the use in the preparation of sunscreen composition is. the compound of the following formula (I):
~ 2H5 NH ~ COOCH2-CH-C4H9 N
(CH3)3C-NH -CO ~ ~ ~ O N
N
NH ~ COOCH2-CH-C4H9 (I) This compound is in the form of a white solid, it has a very high activity in UV-H and has a very high solubility in the solvents commonly used in the formulation of sunscreen compositions.
Some cosmetics manufacturers find some drawbacks in using the solid form of the sunscreen. These drawbacks consists in the troublesome handling of a powder, in the operation of dissolving it in a suitable solvent and in the time necessary for this operation.
Abstract of the invention It has now surprisingly been found that the above drawbacks can be avoided when the compound of formula (I) is provided in the form of a liquid concentrated solution in one or more solvents selected from the group consisting of esters of carboxylic acids.
It is an object of the present invention a solution consisting of from 15 to 60% by weight of a compound of formula (I) ~2H5 , N
t CH3 ) 3C -NH ~CO O ~ ~ ~ N
p ~NS COOCH -CH-C H
(I) 2 i 4 9 and from 40 to 85% by weight of a solvent consisting of at least an ester of formula (II) A-(COO-B)n (II) wherein:
n is the number 1 or 2;
A, when n is 1, is a C6-C20 straight or branched alkyl group, phenyl optionally substituted with one or more C1-C4 straight or branched alkyl groups, hydroxy, C1-C4 straight or branched alkoxy, or when n is 2, A is a C2-C12 saturated or unsaturated alkylene chain, optionally substituted with one or more hydroxy groups or A is a phenylene group;
B is a C3-C18 straight or branched alkyl group; C5-C12 cycloalkyl optionally substituted with one or more C1-C4 straight or branched alkyl groups.
It is another object of the present invention a method for the preparation of said solution.
It is a further object of the present invention a method for the preparation of sun protecting cosmetic compositions comprising the addition of said solution to a cosmetic substrate. The cosmetic compositions containing said solution are also an object of the present invention.
These and other objects of the present invention will be disclosed in detail in the following disclosure and examples.
DPta_,'_1_ed disclosure of the invention According to the present invention, examples of C6 5 C20 straight or branched alkyl are hexyl, heptyl, octyl, dodecyl, tetradecyl, hexadecyl, octadecyl and their isomers, in particular 2-ethylpentyl, heptadecyl, pentadecyl, tridecyl are preferred.
Examples of C2-C12 alkylene chain are ethylene, trimethylene, tetramethylene, hexamethylene, decame thylene, in particular 1-hydroxyethylene and ethene is preferred.
Examples of optionally substituted phenyl ~ are phenyl, toluyl, xylyl, trimethylphenyl, ethylphenyl, isopropylphenyl, terbutylphenyl, hydroxyphenyl, methoxy phenyl, ethoxyphenyl, propoxyphenyl, butoxyphenyl, and their isomers, in particular phenyl and 2-hydroxyphenyl are preferred.
Examples of C3-C1$ straight or branched alkyl are propyl, butyl, pentyl, hexyl, octyl, decyl, tridecyl, pentadecyl, hexadecyl, octadecyl and their isomers.
Examples of cycloalkyl are cyclopentyl, cyclohexyl, 4-ter-butylcyclohexyl, menthyl.
Preferred solvents of formula (II) are: 2 ethylhexyl 2-ethylhexanoate, 2-ethylhexyl stearate,~ 2 ethylhexyl palmitate, bis(2-ethylhexyl) malate, isopropyl myristate, isopropyl palmitate, C12-C15 alkyl benzoate, menthyl salicylate, 2-ethylhexyl salicylate, bis n-octyl maleate, bis n-octyl fumarate.
In a preferred embodiment of the present invention;
the solution consists of 20-50$ by weight' of the compound of formula (I) and of 80-50$ by weight of at least a solvent of formula (II).
The solution according to the present invention is, so to say, ready for use, of simple dosage and use, since it avoids the handling of the substance in the powdery form and its dissolution; therefore significantly facilitating the task of the cosmetic manufacturer.
According to the present invention it is provided a method for the preparation of the above described solution. Said process comprises the addition of a suitable amount of the compound of formula (I) to the solvent under stirring, at a temperature ranging from 0 to 200°C, preferably from 20 to 180°C.
Alternatively, the solution can be prepared by adding the suitable amount of solvent to the compound of formula (I) in the melted state at a temperature ranging from 110 to 180°C.
The solvents of formula (II) used for the preparation of the solutions according to the present invention are esters of mono- or dicarboxylic acids, commercially available and commonly used and in any case preparable with methods well-known in literature.
The solutions object of the present invention are useful for the preparation of cosmetic compositions.
Such compositions are suitable for the cosmetic treat ment of skin, of hair or make-up in the decorative co smetic. A cosmetic method for tanning, while protecting human skin or hair from ultraviolet radiations consists in applying on the skin or hair a suitable amount of a cosmetic composition containing a solution of the present invention. A suitable amount shall be determined directly by the person using the composition or by an expert suggesting a suitable amount depending on the SPF
of the composition, the kind of skin or hair to be protected and the radiation intensity.
According to the present invention, the cosmetic compositions can be solutions, lotions, emulsions of the water-in-oil or oil-in-water type; or can also be in the form of gels, lipsticks, aerosols.
The compositions according to the present invention are prepared by formulating the ingredients usually employed, such as for example oils, fats; emulsifiers, humectant agents, moisturizing agents, emollients, preservatives, surfactants, thickening agents, perfumes, pigments, dyes and other else such as alcohols, polyols, electrolytes, siliconic derivatives.
The more commonly used solvents are natural or synthetic triglycerides, hydrocarbons, esters of fatty aoids with isopropanol, propylene glycol, glycerin, or fatty alcohols, propylene glycol monomethyl- or monoethyl- or monobutylether, dioctyl malate.
The present invention comprises also a method for the protection of the cosmetic compositions themselves from UV radiation by means of the addition of from 0.2 to 40.0%, preferably from 1 to 30%, by weight with respect to the composition of a photostabilizing mixture consisting of the above solution of the compound of formula (I). In this case it is a matter of compositions whose components can undergo unwanted light-induced degradation or colouring, as for example shampoos and hair lacquers, hair dressing lotions, hair-dyeing compositions, make-up formulations, as nail lacquers, foundation, lipstick. Preferred cosmetic formulations are the ones for the protection of skin from sun radiations. Therefore, also a method for stabilizing a cosmetic composition is a further object of the present invention.
On the other hand, the solution according to the present invention is also useful for the preparation of a composition suitable for the protection of skin from ultraviolet radiations, in particular UV-B, with wavelength ranging from 290 to 320 nm.
The cosmetic compositions of the present invention, other than the above described solution, can also contain other complementary sunscreens and particularly those with a maximum absorption from 320 to 380 nm.
Well-known sunscreens which can be combined with the solution of the present invention are for example: 3-(4-methylbenzylidene)camphor, 2-ethylhexyl (4-dimethylami-no)benzoate, 2-ethylhexyl (4-methoxy)cinnamate, 2-hydro-xy-4-methoxybenzophenone, 2,4,6-trianilino-(p-carbo-2-ethylhexyloxy)-1,3,5-triazine, 4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane, 2-ethylhexyl 2-cyano-3,3-diphe-nylacrylate, salts of 2-phenylbenzimidazol-5-sulfonic acid, salts of 2-hydroxy-4-methoxybenzophenone-5-sulfo-nic acid, 1,4-di(3-methylbenzylidenecamphor-10-sulfonic) acid.
Other than the above described solution, the sun protecting compositions according to the present invention can also contain, inorganic pigments commonly used in cosmetics, such as for example titanium dioxide, zinc oxide, silicon oxide or aluminium oxide.
The solution of the present invention can be used for the preparation of a medicament useful for the protection of human skin or hair when exposed to sunlight UV radiations.
The following examples further illustrate the invention:
Example 1 100 g of compound of formula (I) were added, in a period of 15 minutes and under stirring, to 100 g of bis n-octyl maleate pre-heated to 70°C. Once the addition . was finished, stirring was continued for 5 minutes, then the solution was cooled down to 20°C and discharged, to obtain a pale yellow viscous solution.
Example 2 100 g of compound of formula (I) were added, in a period of 30 minutes and under stirring, to 200 g of C12 C15 alkyl benzoate {Finsolv TN by the firm FINITEX) at room temperature. Once the addition was finished, stirring was continued for 2 hours, then the solution was discharged, to obtain a lightly yellow solution.
Examp~, a 3 120 g of compound of formula (I) were added, in a period of 15 minutes and under stirring, to 80 g of iso-propyl myristate pre-heated to 80°C. Once the addition was finished, stirring was continued for 10 minutes, then the solution was cooled to room temperature and discharged, to obtain a very viscous solution.
Example 4 80 g of compound of formula (I) were added, in a period of 15 minutes and under stirring, to 120 g of menthyl salicylate pre-heated to 50°C. Once the addition was finished, stirring was continued for 30 minutes, then the solution -was cooled to room temperature and discharged, to obtain a very viscous yellowish solution.
Examgle ~
5 A suspension consisting of 200 g of Finsolv TN and 100 g of compound of formula (I) was slowly warmed under stirring to 90°C. Once the temperature of 90°C was reached; stirring was continued for some minutes, then the solution was cooled to room temperature and 10 discharged.
Bxamnle 6, In a period of 5 minutes, 120 g of bis n-octyl maleate were added to 80 g of melted compound of formula (I), heated to 160°C.
Once the addition was finished stirring was continued for some minutes, then the solution was cooled and discharged.
Exam 1R a 7 In a period of 5 minutes, 110 g of a mixture consisting of 60 g of menthyl salicylate and 50 g of isopropyl myristate were added to 90 g of melted compound of formula (I), heated to 160°C. Once the addition was finished stirring was continued for 5 minutes, then the viscous solution was discharged.
Example A - Lotion Solution of Example 1 5.0 g Octyl octanoate 48:0 g Triglycerides C8-C10 34.5 g Dioctylcyclohexane 12.4 g Perfume 0.1 g The mixture was stirred for 10-15 minutes.
Examp],~; B - O/W Sun cream C12-C15 Alkylbenzoate 5.0 g Diisopropyl adipate 5.0 g Shea butter 2.0 g a-Bisabalol 0.5 g 4-methoxy-4'-terbutyldibenzoylmethane 2.5 g Solution of Example 4 10.0 g Stabylen 30 (R) (emulsifing agent by 3V SIGMA) 0.3 g Synthalen K (R) (Thickening agent by 3V SIGMA) 0.3 g Abiol (R) (Preservative by 3V SIGMA) 0.3 g Methylparaben 0.2 g Propylparaben 0.1 g Glycerine 5.0 g Aminomethylpropanol 0.5 g Water up to 100.0 g Perfume The fatty phase was warmed to 70 C, sunscreens were added and stirring was done for 10-15 minutes.
Stabylen and Synthalen K were dispersed in w ater and the fatty phase was added under strong stirring the 70C
to previously warmed aqueous dispersio n. The resulting mixture was neutralized with aminomethylpropanol, cooled 25 to 35C and preservatives, glycerine and perfume were added.
C
O/
D
l $xamp - 4.0 g ay-cream e W
Triglyceryl methylglucose distearate Glyceryl stearate 1.0 g 30 C12-C15 Alkylbenzoate 7.5 g Avocado oil 5.0 g Diisopropyl adipate 5.0 g Solution of Example 3 3.0 g 2-hydroxy-4-methoxybenzophenone 2.0 g Synthalen K (Thickening agent by 3V SIGMA) 0.2 g Abiol {R) (Preservative by 3V SIGMA) 0.3 g Methylparaben 0.2 g Propylparaben 0.1 g Aminomethylpropanol 0.15 g Glycerine 3.0 g Water up to 100.0 g Perfume Operations were performed as described in Example B.
~.xample D - 0/W Sun milk PEG-7 Hydrogenated castor oil 7.5 g Lanolin Alcohols in mineral oil 2.5 g Octyl octanoate 7.5 g Dioctylcyclohexane S.O g Cetylstearyl octanoate 5.0 g Solution of Example 1 6.0 g Abiol (R) (Preservative by 3V SIGMA) 0.3 g Glycerine 5.0 g Water up to 100.0 g Perfume The fatty phase was warmed to 70°C and the sunscreens were added.
70°C pre-heated water was added to the fatty phase under strong stirring. After cooling, preservative;
glycerine and perfume were added.
Exam~gle B - Lipstick The base mixture was first prepared:
Beeswax 13.0 g Carnauba wax 7.5 g Lanolin 5:0 g Isopropyl myristate 8.0 g Mineral oil 3.0 g Castor oil 63.5 g - 85 g of this mixture were warmed to melt . 20 g of the solution of example 2 and 7 g of 4-methoxy-4' terbutyldibenzoylmethane as well as perfume and dyes were added to the molten mass, then it was diluted to 1000 g with castor oil and it was cooled at room temperature.
Claims (14)
1. A solution consisting of from 15 to 60% by weight of a compound of formula (I) and from 40 to 85% by weight of a solvent consisting of at least an ester of formula (II) A-(COO-B)n (II) wherein:
n is the number 1 or 2;
A, when n is 1, is a C6-C20 straight or branched alkyl group, phenyl optionally substituted with one or more C1-C4 straight or branched alkyl groups, hydroxy, C1-C4 straight or branched alkoxy, or when n is 2, A is a saturated or unsaturated C2-C12 alkylene chain, optionally substituted with one or more hydroxy groups or A is a phenylene group;
B is a C3-C18 straight or branched alkyl group; C5-C12 cycloalkyl optionally substituted with one or more C1-C4 straight or branched alkyl groups.
n is the number 1 or 2;
A, when n is 1, is a C6-C20 straight or branched alkyl group, phenyl optionally substituted with one or more C1-C4 straight or branched alkyl groups, hydroxy, C1-C4 straight or branched alkoxy, or when n is 2, A is a saturated or unsaturated C2-C12 alkylene chain, optionally substituted with one or more hydroxy groups or A is a phenylene group;
B is a C3-C18 straight or branched alkyl group; C5-C12 cycloalkyl optionally substituted with one or more C1-C4 straight or branched alkyl groups.
2. A solution according to claim 1, consisting of 20-50% by weight of the compound of formula (I) and of 80-50% by weight of at least an ester of formula (II).
3. A solution according to claim 1 or claim 2, wherein the solvent is selected from the group consisting of:
2-ethylhexyl 2-ethylhexanoate, 2-ethylhexyl stearate, 2-ethylhexyl palmitate, bis(2-ethylhexyl) malate, isopropyl myristate, isopropyl palmitate, C12-G15 alkyl benzoate, menthyl salicylate, bis n-octyl maleate, 2-ethylhexyl salicylate, bis n-octyl fumarate and their mixtures.
2-ethylhexyl 2-ethylhexanoate, 2-ethylhexyl stearate, 2-ethylhexyl palmitate, bis(2-ethylhexyl) malate, isopropyl myristate, isopropyl palmitate, C12-G15 alkyl benzoate, menthyl salicylate, bis n-octyl maleate, 2-ethylhexyl salicylate, bis n-octyl fumarate and their mixtures.
4. A process for the preparation of the solution of claims 1-3, which comprises the addition of a suitable amount of the compound of formula (I) to the solvent under stirring, at a temperature ranging from 0 to 200°C.
5. A process for the preparation of the solution of claims 1-3, which comprises the addition of a suitable amount of solvent to the melted compound of formula (I) at a temperature ranging from 110 to 180°C.
6. A cosmetic composition containing from 0.2 to 40.0%
by weight of a solution of anyone of claims 1-3;
by weight of a solution of anyone of claims 1-3;
7. A cosmetic composition according to claim 6, further containing one or more sunscreens selected from the group consisting of:
3-(4-methylbenzylidene)camphor, 2-ethylhexyl (4-dime-thylamino)benzoate, 2-ethylhexyl (4-methoxy)cinnamate, 2-hydroxy-4-methoxybenzophenone, 2,4,6-trianilino-(p-carbo-2-ethylhexyloxy)-1,3,5-triazine, 4-(1,1-dimethyl-ethyl)-4'-methoxydibenzoylmethane, 2-ethylhexyl 2-cyano-3,3-diphenylacrylate, salts of 2-phenylbenzimidazol-5-sulfonic acid, salts of 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 1,4-di(3-methylbenzylidenecamphor-10-sulfonic) acid.
3-(4-methylbenzylidene)camphor, 2-ethylhexyl (4-dime-thylamino)benzoate, 2-ethylhexyl (4-methoxy)cinnamate, 2-hydroxy-4-methoxybenzophenone, 2,4,6-trianilino-(p-carbo-2-ethylhexyloxy)-1,3,5-triazine, 4-(1,1-dimethyl-ethyl)-4'-methoxydibenzoylmethane, 2-ethylhexyl 2-cyano-3,3-diphenylacrylate, salts of 2-phenylbenzimidazol-5-sulfonic acid, salts of 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 1,4-di(3-methylbenzylidenecamphor-10-sulfonic) acid.
8. A cosmetic composition according to claim 6 or 7, selected from the group consisting of: lotion, oil-in-water sun cream, oil-in-water day-cream, water-in-oil sun milk and lipstick.
9. A cosmetic composition according to anyone of claims 6-8, further containing a component selected from the group consisting of: titanium dioxide, zinc oxide, silicon oxide and aluminium oxide.
10. A method for the stabilization of a cosmetic composition against the photoinduced degradation comprising the addition of from 0.2 to 40.0% by weight with respect to the total weight of the composition of the solution of claim 1,
11. A method for the cosmetic tanning of skin consisting in applying on the skin a suitable amount of a cosmetic composition according to claim 6.
12. A method for the cosmetic treatment of hair consisting in applying on the hair a suitable amount of a cosmetic composition according to claim 6.
13. The use of the solution of anyone of claims 1-3 for the preparation of a medicament useful for the protection of human skin from sunlight UV radiations.
14. The use of the solution of anyone of claims 1-3 for the preparation of a medicament useful for the protection of hair from sunlight UV radiations.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/772,873 US5759525A (en) | 1996-12-26 | 1996-12-26 | Concentrated solutions of a 1,3,5-triazine derivative sunscreen and their use for the preparation of cosmetic compositions |
| CA002231080A CA2231080A1 (en) | 1996-12-26 | 1998-03-04 | Concentrated solutions of a 1,3,5-triazine derivative sunscreen and their use for the preparation of cosmetic compositions |
| JP10059295A JPH11292746A (en) | 1996-12-26 | 1998-03-11 | Anti-suntan concentrated solution of 1,3,5-triazine derivative and its use for preparation of cosmetic composition |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/772,873 US5759525A (en) | 1996-12-26 | 1996-12-26 | Concentrated solutions of a 1,3,5-triazine derivative sunscreen and their use for the preparation of cosmetic compositions |
| CA002231080A CA2231080A1 (en) | 1996-12-26 | 1998-03-04 | Concentrated solutions of a 1,3,5-triazine derivative sunscreen and their use for the preparation of cosmetic compositions |
| JP10059295A JPH11292746A (en) | 1996-12-26 | 1998-03-11 | Anti-suntan concentrated solution of 1,3,5-triazine derivative and its use for preparation of cosmetic composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2231080A1 true CA2231080A1 (en) | 1999-09-04 |
Family
ID=31949991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002231080A Abandoned CA2231080A1 (en) | 1996-12-26 | 1998-03-04 | Concentrated solutions of a 1,3,5-triazine derivative sunscreen and their use for the preparation of cosmetic compositions |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5759525A (en) |
| JP (1) | JPH11292746A (en) |
| CA (1) | CA2231080A1 (en) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19817295A1 (en) * | 1998-04-18 | 1999-10-21 | Beiersdorf Ag | Use of compounds that inhibit water-induced removal of endogenous or artificially applied cis- or trans-urocanic acid from human skin in cosmetic or dermatological compositions |
| DE19820827A1 (en) * | 1998-05-09 | 1999-11-11 | Beiersdorf Ag | Ultraviolet B filter combination used in cosmetic or dermatological formulation |
| DE19846771A1 (en) * | 1998-10-10 | 2000-04-13 | Beiersdorf Ag | Use of glyceride waxes to increase the solar protection factor of cosmetic or dermatological compositions containing conventional ultraviolet filters |
| DE19919630A1 (en) * | 1999-04-30 | 2000-11-16 | Cognis Deutschland Gmbh | Sunscreen |
| DE19923672A1 (en) * | 1999-05-22 | 2000-11-23 | Beiersdorf Ag | Cosmetic or dermatological sunscreen preparations containing dioctyl butamidotriazone and one or more film formers and one or more polymers |
| DE19923670A1 (en) * | 1999-05-22 | 2000-11-23 | Beiersdorf Ag | Cosmetic or dermatological sunscreen preparations containing dioctyl butamidotriazone and one or more polyols |
| DE19923646A1 (en) * | 1999-05-22 | 2000-11-23 | Beiersdorf Ag | Cosmetic or dermatological sunscreen preparations containing dioctyl butamidotriazone and one or more glyceride waxes |
| US6906067B2 (en) * | 1999-12-28 | 2005-06-14 | Bristol-Myers Squibb Company | N-heterocyclic inhibitors of TNF-α expression |
| DE10008894A1 (en) * | 2000-02-25 | 2001-08-30 | Beiersdorf Ag | Cosmetic and dermatological light protection formulations containing unsymmetrically substituted triazine derivatives and alkyl naphthalates |
| FR2808443B1 (en) * | 2000-05-05 | 2004-06-04 | Nuxe Lab | MOISTURIZING COSMETIC AND / OR DERMATOLOGICAL COMPOSITION WITH IMPROVED STABILITY |
| DE10038713B4 (en) * | 2000-08-09 | 2020-04-02 | Beiersdorf Ag | Cosmetic and dermatological light protection formulations containing unsymmetrically substituted triazine derivatives and dialkyl adipates |
| US7132423B2 (en) * | 2001-09-21 | 2006-11-07 | Reddy Us Therapeutics, Inc. | Methods and compositions of novel triazine compounds |
| US7173032B2 (en) * | 2001-09-21 | 2007-02-06 | Reddy Us Therapeutics, Inc. | Methods and compositions of novel triazine compounds |
| US7169785B2 (en) * | 2001-09-21 | 2007-01-30 | Reddy Us Therapeutics, Inc. | Methods and compositions of novel triazine compounds |
| US7112587B2 (en) * | 2001-09-21 | 2006-09-26 | Reddy Us Therapeutics, Inc. | Methods and compositions of novel triazine compounds |
| US7163943B2 (en) * | 2001-09-21 | 2007-01-16 | Reddy Us Therapeutics, Inc. | Methods and compositions of novel triazine compounds |
| US7335770B2 (en) * | 2004-03-24 | 2008-02-26 | Reddy U5 Therapeutics, Inc. | Triazine compounds and their analogs, compositions, and methods |
| US20090081142A1 (en) * | 2005-11-24 | 2009-03-26 | Shiseido Company Ltd. | External Preparation for Skin |
| JP2007145722A (en) * | 2005-11-24 | 2007-06-14 | Shiseido Co Ltd | Sun-screen cosmetic |
| JP4679350B2 (en) * | 2005-11-24 | 2011-04-27 | 株式会社資生堂 | Oil-in-water emulsified skin cosmetic |
| IT201600080304A1 (en) | 2016-07-29 | 2018-01-29 | 3V Sigma Spa | COSMETIC COMPOSITIONS OF UV FILTERS |
| IT201600080301A1 (en) | 2016-07-29 | 2018-01-29 | 3V Sigma Spa | NEW TRIAZINE COMPOUNDS AS PHOTOSTABILIZING AGENTS |
| IT201800006038A1 (en) | 2018-06-05 | 2019-12-05 | HIGHLY EFFECTIVE PHOTOPROTECTIVE AGENTS |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3206398A1 (en) * | 1982-02-23 | 1983-09-01 | Basf Ag, 6700 Ludwigshafen | S-TRIAZINE DERIVATIVES AND THEIR USE AS LIGHT PROTECTION AGENTS |
| GB2141626B (en) * | 1983-04-25 | 1987-01-28 | Kao Corp | Cinnamic acid derivatives for lightening melanin pigmentation of skin |
| IT1255729B (en) * | 1992-05-19 | 1995-11-15 | Giuseppe Raspanti | s-triazine derivatives as photostabilising agents |
-
1996
- 1996-12-26 US US08/772,873 patent/US5759525A/en not_active Expired - Fee Related
-
1998
- 1998-03-04 CA CA002231080A patent/CA2231080A1/en not_active Abandoned
- 1998-03-11 JP JP10059295A patent/JPH11292746A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US5759525A (en) | 1998-06-02 |
| JPH11292746A (en) | 1999-10-26 |
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