Cosmetic preparation - Patent Review 4781916

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FIELD OF THE INVENTION

This invention relates to a cosmetic preparation which is mainly useful for removing nail varnish, stregthening the nail structure and improving cuticle texture. It is also useful as a skin cleanser and conditioner for both beauty care and industrial purposes.

BACKGROUND OF THE INVENTION

Conventional nail polish removers, such as acetone, cause dehydration and dewaxing. They remove natural lipids from the nails and surrounding cuticles.

Another problem with conventional nail polish removers, such as acetone, is that they evaporate and spill easily. This disadvantage as well as other disadvantages referred to above have been alleviated to an extent by providing a gel containing acetone with other additives such as colourants, vitamins, proteins and the like. However, the main disadvantage persists and it is an object of the present invention to provide a composition which not only removes nail varnish effectively, but which also acts as a moisturiser and tissue care agent.

THE INVENTION

According to the invention a cosmetic preparation includes one or more esters of dicarboxylic acids and preferably diesters of dicarboxylic acids of the formula

R.sup.1 OOC--(L)--COOR.sup.2

and one or more esters of diols and preferably diesters of diols of the formula

R.sup.1 --CO--O--(M)--O--CO--R.sup.2

in which R.sup.1 and R.sup.2 may be the same or different and each may have from 1 to 7 carbon atoms when combined with L, and from 1 to 5 carbon atoms when combined with M. L consists of 0 to 4 skeletal bridge carbon atoms which may be substituted, fully saturated (one or two double or triple bonds), and if substituted may carry no more extra carbon containing substituents than to provide a total of 10 carbon atoms for the entire diester molecule. M consists of 2 to 6 skeletal bridge carbon atoms which may be substituted or cyclised, fully saturated, or unsaturated (one or two double or triple bonds), and if substituted may carry no more carbon containing substituents than to provide a total of 10 carbon atoms for the entire diester molecule.

In addition it is preferred that no more than two functional groups (for example OH, OR, COOR, where R has the meaning as above) may be present and ether oxygens may link two or more of the carbon atoms in L, M or R.

According further to the invention the preferred diesters are derived from simple dicarboxylic acids or diols. The preferred dicarboxylic acid esters are the diethyl esters of oxalic-, malonic-, succinic-, glutaric-, and adipic acids, and their simple derivatives. The preferred diol esters are the diacetates of 1,2-ethanediol, 1,2- and 1,3-propanediol, various positional and structural isomers of butanediol, pentanediol, and hexanediol including cyclopentane- and cyclohexane diols as well as the corresponding diesters of dioxyethylene- and trioxyethylene glycols, and their simple derivatives.

The diester or diester mixture responsible for dissolving the film forming ingredients in nail varnish make-up preparations may be contained in a solid or semi solid matrix as an oil in water (O/W) or water in soil (W/O) emulsion. The solid or semi solid matrix, besides being a good vehicle for the solvent or solvent blend, provides the lipid or fatty "nourishing" material which counteracts the lipid stripping effect of the solvent(s) thereby avoiding any tissue hardening and damage which provides access to attack by micro-organisms.

The diesters are not water soluble and can therefore not act as dehydrating agents. On the contrary, the water content of the composition provides a moisturising effect.

The compositions of the invention may also contain one or more lipids such as lanolin, various vegetable and animal oils and fats, sterols; moisturisers such as glycerol, monoalkyl ethers of ethylene and propylene glycols and the like.

In addition the matrix may contain surfactants (non-ionic, anionic, cationic) to provide not only emulsifying properties, but also water solubility of the emulsion on removal.

The preferred lipids of the invention are lanolin, plant oils and fats, paraffin (hard, soft, or liquid), cholesterol, sitosterol and the like.

The preferred emulsifiers of the invention are emulsifying wax (B.P.), or (U.S.P.), glycerin monostearate (self emulsifying), Span 60 (10-80), Tween 60 (10-80), polyoxyethylene sterols as primary emulsifiers, and sodium lauryl sulphates as secondary emulsifiers or equivalent emusifiers according to the state of the art.

The preferred moisturisers are monomethyl ethers of ethylene--and propylene glycol. Equivalent moisturisers according to the state of art may be substituted.

Any acceptable preservative can be used, such as butylated hydroxy anisole (BHA), butylated hydroxytoluene (BHT) and the like.

The nail varnish cleansing and tissue conditioning cosmetic may be applied to the nail surface and surrounding tissue with gentle massage for a period of up to two minutes before the treated area is either wiped or rinsed with water; the process can be repeated.

Use of the compositions of the invention not only prevents hardening, embrittlement and cracking of the nails, cuticles and surrounding skin, but ensures that these tissues remain supple and well nourished and remain free from microbial attack and physical damage due to tissue degradation.

The cosmetic products of this invention also act as cleansing agents for the removal of foreign matter such as make-up, (with the possible exception of eye make-up), industrial grime of varied origin, paint, and dirt in general. By replenishing essential moisture and lipid nutrients to skin tissue, these products prevent skin hardening and thus premature aging.

The products of the invention not only achieve the "cleansing" process in an effective and agreeable manner, but at the same time prevent aggressive stripping of moisture and lipids and provide concomitant nail and skin care. Indeed experience has shown that there is a noticeable prevention in nail embrittlement and improvement in texture of the nails and surrounding tissue. An added bonus is the safety aspect since the viscous nature of the products, which ranges from a thick oil to a soft creamy consistency, are spill resistant, and the "solvents" do not evaporate rapidly.

EXAMPLE 1

______________________________________ A Diethyl succinate 46.3% Lanolin (anhydrous) 4.6% Hard paraffin 4.6% Emulsifying wax (B.P.) 4.6% Glycerin monostearate (self-emulsifying) 16.7% B Propylene glycol monomethyl ether 13.9% Water 9.3% ______________________________________

Heat A and B separately to 70.degree.-75.degree. C. Add B to A slowly, and cool gradually with agitation; add preservative, colourant and perfume, as required, at 50.degree. C.

NOTES

(a) The diester solvent may be replaced with any one or mixtures of the preferred solvents specified above ranging from 10 to 90% but preferably 40 to 60%.

(b) Anhydrous lanolin may be substituted by water soluble or liquid lanolin, hydrogenated wool fat, various sterols, and the like up to 20% but preferably between 3 and 10%.

(c) Hard paraffin may be substituted by liquid or soft paraffin, or vegetable or animal oil and fats ranging between 1 and 20% but preferably between 2 and 10%.

(d) The emulsifier may consist of an appropriate combination of non-ionic, anionic or cationic surfactants to achieve the desired hydrophilic to lipophilic balance between 4 to 12 but preferably between 6 and 8.

(e) The propylene glycol monomethyl ether may be replaced by glycerol and glycols and their derivatives with humectant properties in the range of 5 to 15%.

(f) The water content is adjusted accordingly to 100%. Perservative addition is optional but if more than 10% water is included a preservative may be added up to 0.5%.

EXAMPLE 2

______________________________________ A 1,2-Ethanediol diacetate 40% Lanolin (anhydrous) 4% Hard paraffin 4% Span 60 8% General E-5 4% B Propylene glycol monomethyl ether 10% Water 30% Preservative q.s. Perfume q.s. ______________________________________

The method of preparation is as follows: Heat A and B separately to 70.degree.-75.degree. C. and slowly add B to the oily phase with stirring. Add preservatives, colourants and perfumes at 50.degree. C.

EXAMPLE 3

______________________________________ A 1,2-Propanediol diacetate 50% Lanolin (anhydrous) 4% Hard paraffin 4% Span 60 8% General E-5 4% B Water 30% Preservatives q.s. Perfume q.s. ______________________________________

EXAMPLE 4

______________________________________ Diethyl malonate 40-60% Emulsifying wax (B.P.) 5-15% Hard paraffin 2-5% Glyceryl monostearate (self-emulsifying) 5-14% Preservative 0.1% Water to 100% ______________________________________

EXAMPLE 5

______________________________________ Diethyl oxalate 40-47% Lanolin (anhydrous) 5-10% Span 60 6-8% Tween 60 1-2% Sodium lauryl sulphate 1-2% Preservative 0.1% Water to 100% ______________________________________

EXAMPLE 6

______________________________________ Diethyl succinate 40-45% Lanolin (anhydrous) 10-13% Hard paraffin 4-5% Span 60 6-7% Tween 60 2-3% Sodium lauryl sulphate 1-2% Preservative 0.1% Water to 100% ______________________________________

EXAMPLE 7

______________________________________ Diethyl succinate 50% Ethylene glycol monomethyl ether 10% Glycerin monosterate (self- 10% emulsifying B.P.) Generol E-5 5% Anhydrous lanolin 5% Hard paraffin 5% Water 17% ______________________________________

EXAMPLE 8

______________________________________ Diethyl succinate 50% Ethylene glycol monomethyl ether 10% Span 60 10% Anhydrous lanolin 3% Hard paraffin 3% Generol E-10 5% Water 17% ______________________________________

EXAMPLE 9

______________________________________ Diethyl succinate 50% Ethylene glycol monomethyl ether 10% Glycerin monostearate (self- 5% emulsifying B.P.) Generol E-5 5% Anhydrous lanolin 5% Water 25% ______________________________________

EXAMPLE 10

______________________________________ Diethyl succinate 50% Glycerin monostearate (self- 8% emulsifying B.P.) Generol E-5 4% Anhydrous lanolin 4% Hard paraffin 4% Water 30% ______________________________________

EXAMPLE 11

______________________________________ Diethyl succinate 50% Span 60 8% Generol E-5 4% Anhydrous lanolin 4% Hard paraffin 4% Water 30% ______________________________________

EXAMPLE 12

______________________________________ Diethyl succinate 60% Glycerin monostearate (self- 5% emulsifying B.P.) Generol E-5 2% Hard paraffin 2% Anhydrous lanolin 1% Stearic Acid 2% Water 30% ______________________________________

EXAMPLE 13

______________________________________ Diethyl succinate 50% Span 60 8% Generol E-5 4% Wood alcohols 4% Hard paraffin 4% Water 30% ______________________________________

EXAMPLE 14

______________________________________ Diethyl succinate 50% Ethylene glycol monomethyl ether 10% Glycerin monostearate 5% Generol E-5 3% Bees Wax 4% Hard paraffin 3% Water 25% ______________________________________

EXAMPLE 15

______________________________________ Diethyl succinate 50% Ethylene glycol monomethyl ether 10% Span 60 11% Emulsifying wax (B.P.) 5% Hard paraffin 4% Anhydrous lanolin 5% Water 15% ______________________________________

EXAMPLE 16

______________________________________ Diethyl succinate 60% Glycerin monostearate 8% Generol E-5 4% Anhydrous lanolin 5% Hard paraffin 3% Water 20% ______________________________________

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