EA037007B1 - Personal care composition - Google Patents

Abstract

A personal care composition is disclosed comprising from 1 to 90 wt.% of a hydrocarbon oil of an average carbon chain length with 8 or higher carbon atoms; a blend of silicone elastomer and solvent; and a cosmetically acceptable carrier; wherein the solvent is a volatile silicone oil selected from octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, blends of methyl trimethicone and dimethicone and mixtures thereof; and wherein the silicone elastomer has the chemical structure of formula I.

Description

The technical field to which the invention relates

The present invention relates to a personal care composition, in particular to a personal care composition containing a silicone elastomer and petrolatum, which has improved stability and good sensory properties.

Prior art

Hydrocarbon oils are widely used in personal care products to provide various types of skin care and protection by minimizing friction and / or reducing moisture loss. However, they generally have negative sensory properties experienced by consumers. Due to their greasy / greasy feel, the scope of use of hydrocarbon oils has certain limitations.

Silicone elastomers can be used to improve the sensory properties of such compositions. Silicone elastomer, as used herein, means a cross-linked silicone polymer particle that swells significantly in a solvent to form a space-filling material with characteristics similar to a viscoelastic soft solid. Typically, silicone elastomers are used in a mixture of a silicone elastomer and a solvent, which is a dispersion of a silicone elastomer in a solvent.

Most conventional silicone elastomers are siloxanes containing neither hydrophilic nor hydrophobic moiety, resulting in poor compatibility with many organic oils, including hydrocarbon oils such as mineral oil, wax, or petrolatum. It is difficult to obtain stable compositions when they contain high levels of hydrocarbon oils due to the poor compatibility between them. The structure of the silicone elastomer / solvent mixture can degrade, rendering it ineffective in providing the desired sensory properties.

Various approaches have been developed to improve the compatibility between silicone elastomers and organic oils, including optimizing solvent / elastomer blends, adding or replacing solvents, and / or adding modified polydimethicone polymer to silicone elastomers. However, these approaches do not provide satisfactory sensory performance and are not economically feasible.

There is an increasing interest in the development of ways to stabilize compositions containing hydrocarbon oils that result in excellent sensory effects.

The present inventors have surprisingly found that the compatibility between silicone elastomers and organic oils can be improved by using functional silicone elastomers, which are silicone elastomers modified by grafting hydrophobic and / or hydrophilic groups onto the elastomer backbones. Functional silicone elastomers used in this invention are alkyl modified, phenyl modified and / or double modified (alkyl and phenyl) silicone elastomers. It has been found that functional silicone elastomers have shown improved compatibility with hydrocarbon oils. In particular, the double (alkyl and phenyl) modified silicone elastomer has shown better compatibility with hydrocarbon oils, providing a personal care composition having increased stability and desirable sensory properties.

Brief description of the invention

In a first aspect, the present invention relates to a personal care composition comprising (i) 10 to 90% by weight of a hydrocarbon oil with an average carbon chain length of 8 or more carbon atoms;

(ii) a mixture of silicone elastomer and solvent;

(iii) a cosmetically acceptable carrier;

the solvent is a volatile silicone oil selected from octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, mixtures of methyl trimethicone and dimethicone, and mixtures thereof; and wherein the silicone elastomer has the chemical structure of Formula I in which each Rj is independently a C _4-36 alkyl chain, preferably C _8-18 ;

each R2 is independently phenyl or CH3;

each R3 is independently phenyl;

each x is independently an integer from 3 to 100, preferably from 3 to 20; each y is independently an integer from 1 to 100, preferably from 1 to 20; each z is independently an integer from 1 to 100, preferably from 6 to 50; each m is independently an integer from 1 to 100, preferably from 5 to 30; and each n is independently an integer from 4 to 1000, preferably from 40 to 500.

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Compound of Formula I:

In a second aspect, the present invention relates to a packaged personal care product containing the personal care composition of the first aspect of the present invention.

In a third aspect, the present invention relates to a method of using a personal care composition according to any embodiment of the first aspect of the present invention to provide a moisturizing effect.

All other aspects of the present invention will become more apparent upon consideration of the detailed description and the following examples.

Unless otherwise indicated or otherwise indicated, all numbers in this description indicating quantities of material or reaction conditions, physical properties of materials and / or use case may not necessarily be understood as modified by the word about.

All amounts are based on the weight of the final personal care composition, unless otherwise indicated.

It should be noted that when referring to any ranges of values, any particular high value can be associated with any specific low value.

For the avoidance of doubt, the word containing is intended to denote the term including, but not necessarily, the terms consisting of or formed from. In other words, the steps or options listed should not be exhaustive.

The disclosure found herein is to be construed as covering all embodiments found in the claims as having multiple dependencies on each other, regardless of whether the claims may be found without multiple dependencies or redundancies.

When disclosing one feature in relation to one particular aspect of the invention (for example, a composition according to the invention), such disclosure of the invention should also be considered as referring to any other aspect of the invention (for example, a method according to the invention) subject to appropriate changes.

Detailed description of the invention

It was found that functional silicone elastomers modified with alkyl, phenyl or two (alkyl and phenyl) groups showed improved compatibility with hydrocarbon oils. In particular, silicone elastomers modified with two groups (alkyl and phenyl) have shown better compatibility with hydrocarbon oils, providing a personal care composition with increased stability and desirable sensory properties.

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As used herein, the molar content of alkyl means the ratio of moles of alkyl-substituted dimethicone units to the total number of moles of dimethicone units per mole of silicone elastomer unit, unless otherwise indicated.

As used herein, the molar content of phenyl means the ratio of moles of phenyl-substituted dimethicone units to the total number of dimethicone units per mole of silicone elastomer unit, unless otherwise indicated.

Hydrocarbon oil

Suitable hydrocarbon oils of the invention include cyclic hydrocarbons, straight chain aliphatic hydrocarbons (saturated or unsaturated), and branched chain aliphatic hydrocarbons (saturated or unsaturated). The hydrocarbon used herein refers to an organic compound composed entirely of hydrogen and carbon.

The hydrocarbon oil preferably has an average carbon chain length of 8 carbon atoms or more. Illustrative, but not limiting examples of the types of hydrocarbon oils that can be used in this invention include, for example, mineral oil, wax, petrolatum, and mixtures thereof.

Petrolatum, which is known as petrolatum, is a purified mixture of semi-solid hydrocarbons derived from petroleum with a carbon chain length of 25 carbon atoms or more. Petroleum jelly has excellent moisturizing properties and has a melting point that ranges from slightly below 37 ° C to a few degrees above 37 ° C. It is colorless or slightly yellowish (if not highly distilled), clear and devoid of taste and odor when clean. It is insoluble in water. Preferably, the hydrocarbon oil contains or is petrolatum. A commercially available example of a suitable petroleum jelly for use in the invention is MERKUR® 620 from Sasol.

Typically, the personal care composition of the present invention contains 1 to 90% by weight hydrocarbon oils, more preferably 3 to 50%, most preferably 5 to 40%, based on the total weight of the personal care composition and includes all ranges in these limits.

A mixture of silicone elastomer and solvent

Silicone elastomer, as used herein, means crosslinked silicone polymer particles that swell significantly in a solvent to form a space-filling material with viscoelastic soft solid-like properties. Typically, silicone elastomers are used in a mixture of a silicone elastomer and a solvent, which is a dispersion of a silicone elastomer in a solvent. Blends of silicone elastomer and solvent are crosslinked gels that can be obtained from the hydrosilylation reaction. The reaction is carried out in the presence of a minor amount of catalyst, usually platinum derivatives, and in a suitable solvent. Silicone polymers containing silicon hydride (SiH) react with divinyl materials to bond independent silicone chains.

A solvent suitable for dispersing silicone elastomers is a low molecular weight linear or cyclic silicone oil. The elastomer can swell with low molecular weight silicone oil when shear is applied. The low molecular weight silicone oil is preferably a volatile oil, although non-volatile oils can also be used. The volatile silicone oil according to the present invention has a vapor pressure at 25 ° C. of 2.6 to 1400 Pa. Particularly preferred volatile oils are linear siloxanes containing 3 to 9 silicon atoms and cyclic siloxanes containing 4 to 6 silicon atoms, such as cyclopentasiloxane.

In a preferred embodiment, the solvent is a volatile silicone oil. Illustrative but non-limiting examples of the types of volatile silicone oils that can be used in the present invention as a solvent for silicone elastomers include, for example, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, mixtures of methyl trimethicone and mixtures thereof, or the like. Examples of commercially available volatile silicone oils include oils having grades 344, 345, 244, 245 and 246 from Dow Corning Corporation. In a preferred embodiment, the volatile silicone oil is decamethylcyclopentasiloxane, which is commercially available, for example, from a supplier such as Dow Corning Corporation under the tradename DC245.

In a preferred embodiment, the mixture of silicone elastomer and solvent is a mixture of silicone elastomer and volatile silicone oil.

Typically, the mixture of silicone elastomer and solvent contains from 30 to 96% by weight solvent, more preferably from 50 to 94%, and most preferably from 67 to 92%.

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Silicone elastomers suitable for use in the present invention are functional silicone elastomers that are modified by grafting functional groups onto the elastomer backbones. In a particularly preferred embodiment, the functional silicone elastomers used in the present invention are alkyl modified, phenyl modified and / or double modified (alkyl and phenyl) silicone elastomers.

Alkyl-modified functional silicone elastomer can be obtained by reacting a) polysiloxane containing silicon hydride; b) alkene; and c) vinyl-terminated dimethylpolysiloxane in the presence of a hydrosilylation catalyst.

A polysiloxane containing silicon hydride has the general formula:

H

--Si - O ^J a (P), where each a independently represents an integer from 0 to 300, preferably from 5 to 50; and each b is independently an integer from 2 to 300, preferably from 5 to 30.

Silicon hydride content, as used herein, means the number of moles of silicon hydride groups per gram of polysiloxane. Typically, the content of silicon hydride in the polysiloxane ranges from 0.016 to 16.6 mM / g, more preferably from 1 to 10 mM / g, and most preferably from 3 to 8 mM / g, based on the total weight of the polysiloxane and including all ranges therein. limits.

Additionally or alternatively, the polysiloxane containing silicon hydride has a viscosity of 10 to 1000 cSt, preferably 20 to 500 cSt, more preferably 25 to 150 cSt, and most preferably 30 to 80 cSt. Suitable silicon hydride polysiloxanes that are commercially available include Andisil XL-10, Andisil XL-11, Andisil XL-15 from AB Specialty Silicones.

Alkene is an unsaturated hydrocarbon that contains at least one carbon-carbon double bond. Alkenes have two fewer hydrogen atoms than the corresponding alkane (with the same number of carbon atoms) with the general formula CnH ₂ n. Preferably the alkene suitable for use in the reaction has a carbon chain length ranging from C8 to C _18. Illustrative, but not limiting examples of alkenes that can be used in this reaction include, for example, octene, nonene, decene, undecene, dodecene, tridecene, tetradecene, pentadecene, hexadecene, heptadecene, octadecene, or mixtures thereof. Preferably, the alkene is octene, dodecene, hexadecene, or mixtures thereof.

Vinyl-terminated dimethylpolysiloxane has the general formula:

where each k is independently an integer from 4 to 1000, preferably from 40 to 500.

Vinyl-terminated dimethylpolysiloxane contains pendant vinyl groups that can be reacted with a silicon hydride containing polysiloxane.

Vinyl content, as used herein, means the number of moles of vinyl group per gram of vinyl-terminated dimethylpolysiloxane. Typically, the vinyl content of vinyl-terminated dimethylpolysiloxane ranges from 0.05 to 3 mM / g, more preferably 0.1 to 1 mM / g, and most preferably 0.2 to 0.8 mM / g, based on the total weight of vinyl-terminated dimethylpolysiloxane and includes all ranges within these ranges.

Additionally or alternatively, vinyl-terminated dimethylpolysiloxane has a viscosity of 10 to 1000 cSt, preferably 20 to 500 cSt, more preferably 50 to 400 cSt, and most preferably 100 to 250 cSt.

Suitable vinyl-terminated dimethylsiloxanes that are commercially available include Andisil VS-200 from AB Specialty Silicones.

In the reaction, the alkene reacts with a silicon hydride-containing polysiloxane to form an alkyl-modified polysiloxane, which reacts with vinyl-terminated dimethylpolysiloxane to form an alkyl-modified silicone elastomer.

The molar content of alkyl in the alkyl modified silicone elastomer is generally in the range of 0.01 to 0.99, more preferably 0.02 to 0.20.

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In a preferred embodiment, the alkyl-modified functional silicone elastomer has the general formula:

where each R4 independently represents a C _4-36 alkyl chain, preferably C _8-18 ;

each c is independently an integer from 3 to 100, preferably from 3 to 20; each d is independently an integer from 1 to 100, preferably from 1 to 20; each e is independently an integer from 1 to 100, preferably from 6 to 50; and each h is independently an integer from 4 to 1000, preferably from 40 to 500.

Phenyl-modified functional silicone elastomer can be obtained by reacting a) polysiloxane containing silicon hydride; and b) vinyl-terminated dimethylphenylpolysiloxane in the presence of a hydrosilylation catalyst.

The polysiloxane containing silicon hydride is the same as described above.

Vinyl-terminated dimethylphenylpolysiloxane has the general formula:

where each R5 independently represents phenyl or CH ₃ ;

each R _{6 is} independently phenyl;

each f is independently an integer from 4 to 1000, preferably from 40 to 500; and each g is independently an integer from 1 to 100, preferably from 5 to 30.

Vinyl terminated dimethylphenylpolysiloxane contains vinyl pendant groups that may be accessible to react with a silicon hydride containing polysiloxane.

Mole phenyl content as used herein means the ratio of the number of moles of phenyl-substituted dimethicone units to the total number of moles of vinyl-terminated dimethylphenylpolysiloxane dimethicone units. Typically, the phenyl content of vinyl-terminated dimethylphenylpolysiloxane ranges from 1 to 50%, more preferably 3 to 30%, and most preferably 7 to 15%.

Additionally or alternatively, vinyl-terminated dimethylphenylpolysiloxane has a viscosity of 100 to 10,000 cSt, preferably 500 to 8000 cSt, more preferably 800 to 5000 cSt, and most preferably 1000 to 2000 cSt.

Suitable vinyl-terminated dimethylphenylpolysiloxanes which are

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Preferably, the silicon hydride-containing polysiloxane and vinyl-terminated dimethylphenylpolysiloxane are present in the reaction mixture in a weight ratio of 1: 200 to 200: 1, more preferably 1:50 to 50: 1, most preferably 1:30 to 30: 1 ...

The molar content of phenyl in the phenyl-modified silicone elastomer is generally in the range of 0.01 to 0.50, more preferably 0.03 to 0.34.

In a preferred embodiment, the phenyl-modified functional silicone elastomer has the general formula:

where each R ₇ independently represents phenyl or CH ₃ ;

each R8 is independently phenyl;

each r is independently an integer from 3 to 100, preferably from 3 to 20; each s is independently an integer from 2 to 200, preferably from 7 to 70; each p is independently an integer from 1 to 100, preferably from 5 to 30; and each q is independently an integer from 4 to 1000, preferably from 40 to 500.

A double modified (alkyl and phenyl) silicone elastomer can be obtained by reacting a) a polysiloxane containing silicon hydride; b) alkene; and c) vinyl-terminated dimethylphenylpolysiloxane in the presence of a hydrosilylation catalyst.

The polysiloxane containing silicon hydride, alkene and vinyl-terminated dimethylphenylpolysiloxane are as described above.

A double modified silicone elastomer can be obtained by a two-step synthesis by combining reagents. In the first step, the alkene reacts with a polysiloxane containing silicon hydride to form an alkyl-modified polysiloxane. In the second stage, the left unsubstituted silicon hydride groups on the alkyl-modified polysiloxane interact with the side vinyl groups on the vinyl-terminated dimethylphenylpolysiloxane to form a double modified silicone elastomer.

In the first step, the temperature of the reaction mixture can be any suitable temperature at which a polysiloxane containing silicon hydride and an alkene can be reacted to form an alkyl-modified polysiloxane. Preferably, the temperature of the reaction mixture is 5 to 100 ° C, more preferably 10 to 80 ° C, and most preferably 20 to 60 ° C.

The reaction time for the first stage is at least 5 minutes, more preferably at least 10 minutes, most preferably 20 to 60 minutes.

For the second step, the temperature of the reaction mixture may be any suitable temperature at which the alkyl-modified polysiloxane and vinyl-terminated dimethylphenylpolysiloxane can react to form a double modified silicone elastomer. Preferably, the temperature of the reaction mixture is 10 to 120 ° C, more preferably 20 to 100 ° C, and most preferably 40 to 80 ° C.

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The reaction time for the second stage is at least 1 hour, more preferably at least 2 hours, most preferably 3 to 6 hours.

The molar content of alkyl in the double modified (alkyl and phenyl) silicone elastomer is generally in the range from 0.01 to 0.99, more preferably from 0.02 to 0.20.

The molar content of phenyl in the double modified (alkyl and phenyl) silicone elastomer is generally in the range from 0.01 to 0.50, preferably from 0.03 to 0.34.

In a preferred embodiment, the double modified (alkyl and phenyl) silicone elastomer has the general formula:

where each R1 independently represents a C4 _-36 alkyl chain, preferably C _8-18 ; more preferably C ₁₂ ;

each R2 is independently phenyl or CH ₃ ;

each R _{3 is} independently phenyl; and each x is independently an integer from 3 to 100, preferably from 3 to 20;

each y is independently an integer from 1 to 100, preferably from 1 to 20;

each z is independently an integer from 1 to 100, preferably from 6 to 50;

each m is independently an integer from 1 to 100, preferably from 5 to 30; and each n is independently an integer from 4 to 1000, preferably from 40 to 500.

Typically, the mixture of silicone elastomer and solvent contains 1 to 70% by weight of silicone elastomer, more preferably 5 to 50%, and most preferably 8 to 30%.

The mixture of silicone elastomer and solvent preferably contains silicone elastomer and solvent in a weight ratio of 1:20 to 2: 1, more preferably 1:15 to 1: 1, and most preferably 1:11 to 1: 2.

Typically, the personal care composition of the present invention contains a mixture of silicone elastomer and solvent in an amount of 0.1 to 95%, more preferably 10 to 90%, even more preferably 30 to 85%, and most preferably 40 to 70% based on the total weight of the personal care composition and including all ranges within these ranges.

The personal care composition preferably contains a hydrocarbon oil and a mixture of silicone elastomer and solvent in a weight ratio of 1: 100 to 2: 1, more preferably 1:50 to 1: 1, and most preferably 1:10 to 1: 1.2.

Other components

The personal care composition according to the invention can be in any form, including tonics, lotions, creams, mousses, serums or gels, which are suitable for topical application to the skin. The personal care composition can be a no rinse product or a rinse product, preferably a no rinse product, especially a skin care product including skin lotions and skin creams.

The personal care composition of the present invention may further comprise an emollient oil. Suitable emollients include, for example, an alkoxylated aromatic alcohol fatty carboxylic acid ester, polyglycols or diols fatty carboxylic acid esters such as caprylic / capric acid triglyceride, fatty alcohol fatty acid ester, alkoxylated benzyl alcohol derivative, and mixtures thereof ... Preferably the emollient oil is a caprylic / capric acid triglyceride.

Typically, the personal care composition of the present invention contains an emollient oil in an amount of 0.01 to 10%, more preferably 0.1 to 8%, most preferably 1 to 6%, based on the total weight of the personal care composition, and including all ranges within these limits.

The personal care composition of the invention contains a cosmetically acceptable carrier. The carrier can be a liquid or solid material. Typically, the carrier is present in an amount of 10 to 99.9%, more preferably 20 to 95%, most preferably 40 to 85%, based on the total weight of the personal care composition, including all ranges within these ranges. Suitable carrier classes include water, silicones, polyhydric alcohols, hydrocarbons, triglycerides, and thickening powders.

In a preferred embodiment, the personal care composition is anhydrous. As used herein, the term anhydrous refers to a composition containing less than 1.5 wt% water, preferably less than 1.0%, and more preferably less than 0.75%, and even more preferably less than 0.5%, and even more preferably less than 0.1%, and most preferably from 0.0 to 0.01%, based on the total weight of the personal care composition, including all ranges within these ranges.

The personal care composition may further contain other ingredients that are conventional in the art to improve physical properties and performance. Suitable ingredients include, but are not limited to, wetting agents, thickening agents, opacifying agents, binders, coloring agents and pigments, pH adjusting agents, preservatives, pearlescent agents, fragrances, viscosity modifiers, dietary supplements, buffering agents, conditioners, natural extracts, essential oils, and skin-beneficial agents including anti-inflammatory agents, cooling agents, antiperspirants, anti-aging agents, anti-acne agents, antimicrobial agents, and antioxidants.

A wide variety of packages can be used for storage and delivery of personal care compositions. Packaging often depends on the type of personal care end use. For example, non-rinse skin lotions and creams, shampoos, hair conditioners and shower gels typically use plastic containers with a lid on the dispensing end. Typical closures include screw caps, non-aerosol pumps, and swing-off hinged caps. Packages for antiperspirants, deodorants and depilatory products may include a container with a roll-on ball at the dispensing end. Alternatively, these types of personal care products can be supplied as formulated sticks in a push-and-pull container where the stick moves on a stand towards the dispensing opening. Pressurized metal cans with propellant and spray nozzle serve as packaging for antiperspirants, shaving creams and other sprayable personal care products. Toilet bars can be wrapped in cellulose or plastic wrappers, or inside a cardboard box, or even further wrapped in shrink plastic wrap.

The invention further relates to a method of using a personal care composition to provide a beneficial moisturizing effect to the skin of an individual in need thereof.

The following examples are presented to facilitate understanding of the present invention. The examples are not intended to limit the scope of the claims of the present invention.

Examples of

Example 1.

This example demonstrates the oil compatibility of blends of silicone elastomers and white petrolatum (WPJ).

Making mixtures of silicone elastomer and solvent

Materials

Silicon hydride polysiloxane (Andisil XL-10), vinyl terminated dimethyl polysiloxanes (Andisil VS-200), vinyl terminated dimethyldiphenyl polysiloxane (Andisil SF-2430) were obtained from AB Specialty Silicones. Decamethylcyclopentasiloxane (DC245) was obtained from Dow Corning Corporation. The platinum catalyst is a complex solution of platinum (0) -1,3-divinyl-1,1,3,3-tetramethyldisiloxane in xylene from Sigma

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Aldrich. White petrolatum (MERKUR® 620) was obtained from Sasol. All chemicals were used as received, without further purification.

Solid content, as used herein, refers to the weight percentage of silicone elastomers in the silicone elastomer / solvent mixture.

Non-functional silicone elastomer / DC245 blend

0.382 g Andisil XL-10, 12 g Andisil VS-200 and 70 g DC245 were mixed in a flask. Added 25 μl of a platinum complex as a catalyst and the reaction mixture was kept at 45 ° C with heating under reflux and stirred at 200 rpm for 5 hours. After completion of the reaction, the gel mixture can be diluted to different solids content at 45 ° C. ...

Alkyl Modified Silicone Elastomer Blend / DC245

1.068 g of Andisil XL-10 and 23 g of DC245 were mixed and mixed in a vial. To the mixture was added 1.1 g of isooctene, followed by the addition of 10 μl of a platinum complex as a catalyst. The mixture was stirred at room temperature for 30 minutes. Then the reaction mixture was transferred to a flask. To the mixture were added 23 g of DC245 and 20 g of Andisil VS-200, and then the mixture was kept at 45 ° C under reflux and stirred at 200 rpm. Added 15 μl of a platinum complex as a catalyst and the reaction mixture was stirred at 45 ° C for 5 hours. After completion of the reaction, the gel mixture can be diluted to different solids content at 45 ° C.

Phenyl-modified silicone elastomer blend α / DC245

0.6 g Andisil XL-15, 14 g Andisil SF-2430 and 70 g DC245 were mixed and mixed in a vial followed by the addition of 25 μl of a platinum complex catalyst. The mixture was kept at 60 ° C with heating under reflux and stirred at 200 rpm for 4 hours. After completion of the reaction, the gel mixture can be diluted to various solids contents at 60 ° C. A mixture of dual modified silicone elastomer / DC245 1.02 g of Andisil XL-10, 0.94 g of dodecene and 4 g of DC245 were mixed and stirred in a vial followed by the addition of 2 μl of a platinum complex as catalyst. The mixture was stirred at 60 ° C for 30 minutes. Then the reaction mixture was transferred to a flask. To the mixture were added 40 g of DC245, 20 g of Andisil SF-2430 and 6 μl of a platinum complex as a catalyst, and the mixture was kept at 60 ° C under reflux and stirred at 200 rpm for 4 hours. After completion of the reaction, the gel mixture can be diluted to various solids contents at 60 ° C.

The ways

Gel mixtures (mixtures of silicone elastomer and solvent) were diluted to a solids content of 14.5%. Samples were prepared by adding WPJ to various gel mixtures in varying amounts ranging from 10 to 40%. The mixtures were stirred well at room temperature, heated at 45 ° C for 2 hours and then cooled to ambient temperature.

Amplitude Sweep Rheological Analysis In the Amplitude Sweep Rheological Test, the accumulation modulus and loss modulus represent a viscoelastic property. Typically, the modulus of storage (initial G ') represents elasticity and modulus of loss (initial G) represents viscosity. Critical points (FP,% strain) with percentage strain represent the stability of the swellable structure of the silicone elastomer / solvent mixture. In general, for in-house made silicone elastomers, the acceptable storage modulus range (initial G ') is 800 to 4000 Pa for personal care applications. For the critical point, deformation above 10% means good stability of the swellable structure.

An MCR301 rheometer (Anton Paar) equipped with 25 mm parallel plates and measuring cells was used for rheological amplitude sweep at 25 ° C with a 1 mm measurement position and a 30 mm lift position.

The profile of the storage modulus (G '/ Pa) and the critical point (FP,% strain) were recorded and summarized in Tables 1 and 2, respectively.

Table 1

Blend ^a silicone elastomer / DC 245 WPJ ^with Macc.% In WPJ blend and blend 0 ten 20 thirty 40 DC9045 ^b 3714 3276 1285 271 312 NSE 1090 1139 1175 630 2313 ASE 1613 1805 1979 1200 1389 PSE 1105 1176 1322 1303 1651 DSE 1795 2167 2344 2373 2072

a) The silicone elastomer / DC245 blend is selected from a proprietary non-functional silicone elastomer (NSE) / DC245 blend, an alkyl modified silicone elastomer (ASE) / DC245 blend, a phenyl modified silicone elastomer (PSE) / DC245 blend and a double modified (alkyl and phenyl) Silicone Elastomer (DSE) / DC245.

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b) DC9045 is a commercially available non-functional silicone elastomer octamethylcyclotetrasiloxane dispersed in decamethylcyclopentasiloxane from Dow

Corning.

c) White petrolatum is commercially available under the trade name MERKUR® 620 from Sasol.

Table 2

The mixture of silicone elastomer ^and / DC245 WPJ ^with Macc.% In WPJ blend and blend 0 ten 20 thirty 40 DC9045 ^b 60 51 45 25 5.5 NSE 75 72 52 25 7.2 ASE 70 70 64 40 thirteen PSE 80 70 64 39 6.4 DSE 64 64 64 38 20

results

When WPJ was added to the mixture of silicone elastomer and solvent in an amount of less than 40 wt%, the mixture of silicone elastomer and solvent predominated in the structure. It can be seen that functional silicone elastomers do give better WPJ oil compatibility compared to non-functional silicone elastomers.

For a sample containing DC9045 or a proprietary non-functional silicone elastomer (NSE), the initial G 'and FP values fell rapidly as the amount of WPJ in the mixture increased, indicating poor compatibility between silicone elastomers and WPJ, and the swellable structure of the silicone elastomer / solvent mixture collapsed ... For the sample containing NSE, the initial G 'value increased rapidly when WPJ was added at 40 wt%, indicating that WPJ predominated in the blend structure. For samples containing functional silicone elastomers, it can be seen that samples containing ASE or DSE with varying amounts of WPJ had initial G 'and FP values within an acceptable range, indicating that the silicone elastomer had good WPJ oil compatibility. , and the swellable structure of the silicone elastomer / solvent mixture was well maintained.

Example 2.

This example demonstrates the storage stability of compositions containing silicone elastomers and WPJ. All ingredients are expressed as% by weight of the total formulation and as active ingredient content.

Table 3

Ingredient Mass percentage WPJ ^C thirty Blend ^a silicone elastomer / OC245 57.3 PEG-12 dimethicone 2 Cerotil dimethicol 2 Caprylyl glycol 0.5 Mica, stearyl triethoxysilane 1.5 Phenoxyethanol 0.7 Colloidal oat flour one Glycerol five

The ways

In-house silicone elastomer and solvent mixtures were prepared as described in Example 1. Samples were prepared by adding different silicone elastomer and solvent mixtures (14.5% solids) of the same amount to the base formulation.

Stability testing

Stability, as used herein, refers to a composition that retains its appearance, odor, and basic structure without phase separation. When the composition becomes unstable, phase separation occurs with some oil release observed in the upper layer of the mixtures, indicating poor storage stability and poor oil compatibility.

Samples were poured into plastic bottles and filled to 2/3 of the bottle volume. The samples were then stored at 50 ° C in an oven. For stability testing, samples were checked daily. Observation was made when the samples were still warm, and then the samples were left in the oven for 24 hours until the next observation. Samples were stored at 50 ° C for 8 weeks and at ambient temperature for 8 weeks.

The volume of oil release was recorded in Table 4.

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Table 4

Days Oil release volume / ml NSE ASE PSE DSE one 0 0 0 0 3 one 0 0 0 five 3 one 0.5 0 8 4 2 one 0 fifteen 6 4 3 0 22 7 five 4 0 44 7.5 6 five 2 51 7.5 7 6 2 57 7.5 7.5 7 3

results

The results show that the samples containing the functional silicone elastomer were much more stable than the sample containing the non-functional silicone elastomer, while also showing that the functional silicone elastomer has better WPJ oil compatibility.

For samples containing functional silicone elastomers, it was additionally shown that samples containing DSE showed much higher storage stability than samples containing ASE or PSE.

Claims (15)

1. Composition for personal care containing (i) from 1 to 90 wt.% Hydrocarbon oil with an average carbon chain length of 8 or more carbon atoms; (ii) a mixture of silicone elastomer and solvent; (iii) a cosmetically acceptable carrier; wherein the solvent is a volatile silicone oil selected from octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, mixtures of methyl trimethicone and dimethicone and mixtures thereof, while the volatile silicone oil has a vapor pressure at 25 ° C from 2.6 to 1400 Pa; and wherein the silicone elastomer has the chemical structure of formula I: a compound of formula I, - 11 037007 where each R1 independently represents a C _{4-36 -alkyl} chain; each R2 is independently phenyl or CH3; each R3 is independently phenyl; and each x is independently an integer from 3 to 100; each y is independently an integer from 1 to 100; each z is independently an integer from 1 to 100; each m is independently an integer from 1 to 100; and each n is independently an integer from 4 to 1000. 2. A composition according to claim 1, characterized in that the hydrocarbon oil is a mineral oil, wax, petrolatum or a mixture thereof, preferably petrolatum. 3. A composition according to claim 2, characterized in that the petrolatum has a carbon chain length of 25 or more carbon atoms. 4. A composition according to any one of the preceding claims, characterized in that the hydrocarbon oil is present in an amount of 3 to 50%, preferably 5 to 40%, based on the weight of the composition. 5. A composition according to any one of the preceding claims, characterized in that the volatile silicone is decamethylcyclopentasiloxane. 6. A composition according to any one of the preceding claims, characterized in that R1 of the silicone elastomer is a C _8-18 alkyl group, preferably a C1 ₂ alkyl group. 7. A composition according to any one of the preceding claims, characterized in that R2 of the silicone elastomer is a phenyl group. 8. Composition according to any one of the preceding claims, characterized in that the molar alkyl content of the silicone elastomer is in the range from 0.01 to 0.99, more preferably from 0.02 to 0.20, wherein the molar alkyl content means the ratio of the molar alkyl substituted dimethicone units to the total number of moles of dimethicone units per mole of silicone elastomer unit. 9. A composition according to any one of the preceding claims, characterized in that the molar phenyl content of the silicone elastomer is in the range from 0.01 to 0.50, preferably from 0.03 to 0.34, wherein the molar phenyl content means the ratio of the molar phenyl-substituted dimethicone units to the total number of dimethicone units per mole of silicone elastomer unit. 10. A composition according to any one of the preceding claims, characterized in that the mixture of silicone elastomer and solvent contains silicone elastomer in an amount of 1 to 70% by weight of the mixture, more preferably 5 to 50%. 11. A composition according to any one of the preceding claims, characterized in that the mixture of silicone elastomer and solvent comprises silicone elastomer and solvent in a weight ratio of 1:20 to 2: 1, more preferably 1:15 to 1: 1. 12. A composition according to any one of the preceding claims, characterized in that the composition comprises a mixture of silicone elastomer and solvent in an amount of 0.1 to 95% based on the total weight of the composition, more preferably 10 to 90%. 13. A composition according to any one of the preceding claims, characterized in that the composition comprises a hydrocarbon oil and a mixture of silicone elastomer and solvent in a weight ratio of 1: 100 to 2: 1, preferably 1:50 to 1: 1. 14. A composition according to any one of the preceding claims, characterized in that the composition further comprises an emollient oil selected from the group consisting of an ester of an alkoxylated aromatic alcohol with a fatty carboxylic acid, esters of polyglycols or diols with a fatty carboxylic acid, such as caprylic triglyceride / capric acid, fatty alcohol fatty acid ester, alkoxylated benzyl alcohol derivative, and mixtures thereof. 15. A method of providing a moisturizing effect, comprising the step of topically applying the personal care composition according to any one of claims 1-14 to the skin of an individual in need thereof.