FR2471210A1 - SILICONE-WATER EMULSION, PROCESS FOR PREPARING THE SAME, EPIDERM ENHANCEMENT COMPOSITION INCLUDING SUCH EMULSION, AND METHOD FOR APPLYING THE COMPOSITION - Google Patents

Abstract

STABLE EMULSION REQUIRING NO CRUSHING. EMULSION COMPRISING: A.100PARTMENTS BY WEIGHT OF A CYCLIC POLYSILOXANE OR OF A COMBINATION OF CYCLIC POLYSILOXANES CHOSEN FROM THE COMPOUNDS RESPONDING TO THE GENERAL FORMULA: (CF DRAWING IN BOPI) IN WHICH N REPRESENTS A WHOLE NUMBER, INCLUDED BETWEEN 3 AND 10, INCLUDED BETWEEN 3 AND 10 R IS CHOSEN FROM THE GROUP CONSTITUTED BY -CH, - (CH) CH, -CHCHCF, -CHCH, CH, AND THEIR COMBINATIONS, AND Z REPRESENTS A WHOLE NUMBER BETWEEN 1 AND 10; B. FROM 0.7 TO 666PARTMENTS BY WEIGHT OF AN EMULSIONING AGENT; AND C. FROM 5.0 TO 960 PARTS BY WEIGHT OF WATER. APPLICATION TO COSMETOLOGY.

Description

The present invention relates to compositions of

  processes and processes for the preparation of silicone

  stable water based volatile cyclic polysiloxanes not requiring grinding or homogenization, and which are particularly useful for cosmetic and medicinal applications.

  The silicone-water emulsion composition of the present invention

  This is a particularly suitable vehicle for

  the application of agents for improving the soul. The ex-

  "epidermis enhancers" refers to compositions that are generally considered to be

  have a beneficial effect when applied to certain

  parts of the body. These agents include, for example

  a large number of cosmetic, medical and pharmaceutical compounds

ceutical.

  In the category of cosmetics, there are many products that can be advantageously applied to the skin, in the form of silicone emulsions. Examples of such cosmetics include eyelid shadows, foundations, blushes, lipsticks, mascaras and eye shadows, covering-type compositions and anti-wrinkle creams, moisturizing products,

  products concealing acne, depilatories,

  to remove the cuticle, etc. These emulsions can also be used for

  cleaning, in the form of shampoos, soaps,

  treating and moisturizing milk. Hair dyes can also be applied in a vehicle consisting of a

silicone-water emulsion.

  Among other uses in cosmetology, there may be mentioned the application of perfumes, colognes, and perfumes in sachets, on the body. We can mention among the applications

  Deodorants and antiperspirants

  pirants. Among the many medical applications of this type of vehicle emulsion, include the use of first aid products, such as burn ointments, and

  antiseptic applications. For example, it is still possible to

  to successfully fight the skin of the killing agents

  warts and calluses in this type of vehicle

  staged by a silicone-water emulsion.

  It is of course possible to vary the consistency of the silicone-water emulsion of the present invention, which may range from the consistency of a lotion to that of ointments or ointments of the gel type (in the order of that of petrolatum). ) Passing by

  the consistency of pasta as creams.

  Silicones are synthetic polymers which are ordinarily commercially prepared from chlorosilane monomers, and which are found in the form of resin fluids and rubbery gums. These polymers, once incorporated into emulsions, fats, pastes, etc. are of particular interest in the cosmetics industry. Can be used in these compositions a large

  number of materials in connection with silicones.

  Monomeric chlorosilanes are volatile materials

  very reactive liquids that react rapidly with moisture to form silicones and hydrochloric acid as a by-product. In the presence of moisture, they are therefore considered as corrosive materials, which may have

  dangerous properties, and which are to be handled with care.

  However, when converted into silicone polymers, these materials become harmless and inert substances. Silicones can be mixed with other materials to produce different final compositions, and it is often in the nature of the non-silicone component that

  depends the physiological effect of the final composition.

  The toxicological properties of silicones have been extensively studied, and the group consisting of polymeric silicone fluids and resins usually has very low toxicity. From a practical point of view, the risks they present are extremely minor. Fluid silicone polymers have been subjected to skin irritation and spot sensitization tests and these tests have conventionally shown that they are safe. The low toxicity rate of the silicone compounds has even led to the approval and the successful use of silicone fluids

  for medical and dental applications.

  Silicone fluids are generically

  provides excellent protection against irritating

  waterborne products such as hard detergents and other

  household cleaning products. Chemical inertia and the ex-

  this is a waterproofing agent for silicone fluids

  the main reasons for their effectiveness in the prevention of dermatitis. Silicones can also have an emollient action, and give a nice non-sticky "feel". Superior sun creams and lotions can be prepared using silicones, since the silicone fluid is a carrier for the filtering agent and is not removed by water, either from bathing or perspiration. Emulsions containing volatile cyclic polysiloxanes have previously been formulated using

  emulsifiers such as dodecylbenzenesulphonic acid,

  Once these systems require crushing or homogenization to emulsify the immiscible phases. It is possible

  to emulsify preparations of this type with

  concentration of cyclic-volatile substances of only 55%, and emulsions of this type are frequently used to carry out the emulsion-type polymerization of substances

  cyclic such as octamethyltetrasiloxane.

  The present invention provides a method which makes it possible to emulsify higher concentrations of

  cyclic polysiloxanes, without any grinding or homogenisation

  isation is necessary. In addition, the present invention provides stable emulsions of cyclic polysiloxanes, which do not usually "break" during normal storage and under normal use conditions even when the volatile cyclic polysiloxane concentration is 80% or more. This is a particularly advantageous property for consumer products since it can therefore ideally use these emulsions to convey agents for improving the epidermis on the skin of a skin.

  user in an advantageous manner.

  In addition, the present invention provides a system for emulsifying volatile cyclic polysiloxanes which provides opaque to transparent materials that can be readily incorporated into many products.

  intended for consumers, and in particular

  perspirants and deodorants, etc. Other potential uses of water-based emulsions of cyclic substances include skin care products such as

  hand lotions, products for refreshing

  skin, hair preparations, and other care aids. As indicated above, the process of the present invention provides the means of varying the consistency of these emulsions according to the application

final product.

  These silicone-water emulsions still have the advantage

  to be composed of cyclic polysiloxane constituents re-

  latively volatile so that the base of the vehicle of the

  The emulsion will eventually evaporate from the skin and only the skin-improving agent will remain on it.

  The present invention provides a silicone emulsion

  water, preparation processes and applications, the emul-

including: -

  (A) 100 parts by weight of a cyclic polysiloxane or a combination of cyclic polysiloxanes selected from compounds having the general formula CH3

E

  in which n represents an integer from 3 to 10, R is selected from the group consisting of: 3CH3 - (CH2) zCH3 C2-CH2-CF3, -CH2 = CH2, -C6H5, and combinations thereof and z represents a number between 1 and 10 (B) of 0.7 to 666 parts by weight of an emulsifier; and (C) from 5.0 to 960 parts by weight of water; and the process for preparing the emulsion comprising stirring the mixture with moderate heating until the emulsion is

feeling the desired consistency.

  The present invention provides a silicone emulsion

  which comprises 100 parts by weight of a cyclic polysiloxane

  or a combination of cyclic polysiloxanes having the general formula: wherein n represents an integer from 3 to 10, R represents -CH3, - (CH2) zCH3, -CH2- CH2-CF3, -CH2 = CH2, or C6H5, or combinations thereof and z represents an integer between 1 and 10. The polysiloxanes corresponding to this formula are known to be volatile cyclic silicones and this volatility property is interesting when they are incorporated into the composition of the emulsion,

  to whom they then communicate advantageous properties.

  Octamethyltetrasiloxane and decamethylpentasiloxane

  volatile cyclic siliconesparticularly

interesting.

  The volatile cyclic polysiloxane is combined with an agent

  emulsifier and water to form a silicone-water emulsion.

  The order of mixing of the constituents is not critical, however, particularly satisfactory results are obtained when mixing the emulsifying agents and water to form

  a premix to which the volatile cyclic substances are added

  tiles. The cyclic polysiloxane is preferably added to a premix comprising from about 50 to 200 parts by weight of water, mixed with 100 parts by weight of one or more emulsifiers, and heated to what

  a homogeneous mixture was obtained.

  This premix is suitable for preparing a silicone emulsion

  cone-water having the consistency of a paste, however if it is desired a more liquid consistency or the consistency of a lotion, it can use up to 2000 parts or more of water

  per 100 parts of emulsifying agents. Emulters

  The most important nonionic, anionic, cationic or amphoteric emulsifiers are the nonionic emulsifiers, which are highly ethoxylated. It's with

  ethoxylated acids, ethoxylated and non-ethoxylated sorbitan esters

  ethoxylates, ethoxylated alkylphenols, and ethoxylated ethers

  that we get the best results.

  Examples of emulsifiers which can be used to form the silicone-water emulsions of the present invention include the following compounds, without it being necessary to limit it to: 1) ethoxylated fatty acids such as: polyoxyethylene (8) stearate polyoxyethylene (40) stearate polyoxyethylene (50) 2) stearate sorbitan esters such as: sorbitan monolaurate sorbitan monopalmitate sorbitan monostearate sorbitan tristearate sorbitan monooleate sorbitan trioleate 3) ethoxylated sorbitan esters: polyoxyethylene sorbitan monolaurate (20) polyoxyethylene sorbitan monolaurate (4) polyoxyethylene sorbitan monopalmitate (20) polyoxyethylene sorbitan monostearate (20) polyoxyethylene sorbitan tristearate (20) ) polyoxyethylene sorbitan monooleate (20) polyoxyethylene sorbitan monooleate (5) sorbitan trioleate polyoxyethylene (20) 4) ethoxylated esters such as: polyoxyethylene lauryl ether (4) polyoxyethylene lauryl ether (23) polyoxyethylene (20) cetyl ether polyoxyethylene (10) stearyl ether polyoxyethylene oleyl ether (20) )) ethoxylated alkylphenols such as: alkylphenol polyoxyethylene glycol (C8H17C6H4) (OCH2CH2) nOH

CAS # 9036-19-5

(C9H19C6H4) (OCH2CH2) nOH

CAS # 26-27-38-3

  About 15 to 50 parts by weight of this premix are added.

  water-emulsifying agent per 100 parts by weight of poly-

  cyclic siloxane when it is desired to obtain an emulsion

  silicone-water having the consistency of a paste.

  We can add up to about 1000 parts of this

  mixture per 100 parts of volatile cyclic polysiloxane

  to obtain a product of low viscosity, having the

  a lotion: By adjusting the various process parameters, such as

  the volatile cyclic polysiloxane content, the emulsifying agent

  sizing and in water, as well as the degree of mixing, it is

  possible to act on the consistency of the product. We can pre-

  parry the silicone-water emulsion in the form of a lotion or of a paste or a cream, and it can be made

  even more viscous, in the form of an ointment, a pom-

  made or gel. We choose, of course, the consistency

  the end use that one wants to make of the product.

  Silicone-water emulsions used as vehicles

  may contain from 0.1 to 20,000 parts by weight of one or more

  skin improvement agents per 100 parts of emulsion. This extended range includes products consisting of a nearly pure silicone-water emulsion that contains a small amount of skin-enhancing agent, as well as products that contain only a small amount of silicone-water emulsion. . The term "epidermal enhancer" refers to an additive of a cosmetic or medical nature which is generally considered to be

  achieves beneficial results when applied

  than externally on the skin of a user. the silicone water emulsion of the present invention constitutes a vehicle

  particularly suitable for the application of deodorant agents

  gilding or anti-perspirants on the body.

  The water-emulsifying premix is prepared by stirring and moderately heating its components until a uniform mixture is obtained after which the cyclic polysiloxane is added and slowly mixed without grinding or homogenization. be necessary. Grinding and homogenization may be used, if desired, and the term "mixing" embraces these processes as well as simple agitation. The term "mixture" therefore covers a continuous process, using, for example, a Werner apparatus

  Pfleiderer, in which one can introduce, with a flow rate

  safe, currents of each of the components in a device

  double screw. In the same way, a Henshel mixer with

  High speed, a sonolator homogenizer equipped with a vibrating blade, and a smooth container equipped with a mechanical stirrer consisting of a turbine blade, will all give satisfactory results. The silicone-water-emulsifying agent mixture is then vigorously stirred at a temperature of between 20 ° C. and 80 ° C. until it is obtained

  an emulsion having the desired consistency. We can add

  ter a bactericidal agent such as Formalin, if desired.

  The water and the emulsifying agent are premixed

  in a 2 liter stainless steel beaker equipped with a hot plate, a mechanical air stirrer, and a thermometer, heating to a temperature of between about 20 and 80 C, and preferably and 75 C, and stirring to obtain a homogeneous mixture when all the solid substances have melted. Then add slowly

  the cyclic polysiloxane which may be octamethyltetrasi

  loxane, decamethylpentasiloxane, or a combination thereof, or a combination of other polysiloxanes, with the aqueous premix and is stirred vigorously at a temperature between about 30 and 800C, and preferably between 50 and 600C,

  until a homogeneous emulsion having

  resistance of a fat. Small amounts of formalin can be added when the product is homogeneous to prevent bacterial activity. Unlike what happens

247121 C

  for many conventional silicone emulsions, it is not necessary to use colloid grinding or homogenization to prepare emulsions, but

  these techniques can be used if desired.

  - The consistency of the emulsion can be adjusted by the amount of water added. For a water content of 15%, the emulsion has the consistency of a fat, but if water is added, the viscosity of the system is lowered to obtain the consistency of a lotion, and

  use an even larger amount of water to pre-

  add an emulsion of low viscosity. Emulsions

  silicone-water of the present invention are completely

persables in the water.

  In addition, the consistency of the composition can be further modified depending on the amount of cyclic polysiloxanes added. In other words, the more cyclic substances are added, the thicker the emulsion and the closer its consistency is to that of a fat, a lower content of cyclic polysiloxanes will lead to an emulsion less

thick.

  The emulsifying agents themselves have an effect on the consistency of the product. A solid emulsifying agent such as polyoxyethylene-40 stearate will make the emulsion thicker, and of a consistency closer to that of a fat, while a more liquid emulsifying agent will lead to a product.

having the consistency of a lotion.

  As can be seen, a wide range of emulsion compositions can be obtained by varying one of the following parameters of the process: the concentration of water, polysiloxane

  cyclic, emulsifying agents, and the type of emulsifiers

  used, solid or liquid.

EXAMPLE 1

  It was introduced into a 2 liter stainless steel beaker

  200 grams of water, 82 grams of polystyrene stearate

  oxyethylene, and 67 grams of sorbitan monostearate, which was heated to a temperature between 65 and 750C, with stirring, until a uniform mixture was obtained when all the solid substances had melted. We

  then slowly added 900 grams of decamethylpenta

  siloxane to the aqueous system and stirred vigorously at a temperature between about 50 and 60 ° C. to form a uniform emulsion having the consistency of a fat. 2 grams of formalin was added once. the product become homogeneous, to prevent bacterial activity. We have

  formed the emulsion without crushing colloids, nor homogenizing

  and a stable, thick, paste-like emulsion which can be used as a carrier for the application of an epidermal enhancer such as a deodorant or antiperspirant directly on the skin. the skin.

EXAMPLE 2

  The procedure of Example 1 was followed, but modified by the additional addition of 11% by weight of polyoxyethylene 20 sorbitan monooleate, which made it possible to obtain

  an emulsion having the consistency of a lotion and containing

  about 64% by weight of pentasiloxane, which was suitable for

  be used in cosmetics

EXAMPLE 3

  An emulsifying agent-water premix comprising 135 grams of polyoxyethylene 40 stearate, grams of sorbitan monostearate and 300 grams of water was prepared according to the method of Example 1. 1300 grams of decamethylpentasiloxane were added thereto, and an emulsion having the consistency of a fat was obtained. We added

  formalin as a bactericidal agent.

EXAMPLE 4

  A premix of emulsifying agents was prepared.

  taking 255 grams of water, 82 grams of polyoxy-

  40-ethylene and 67 grams of sorbitan monostearate,

  according to the method of Example 1, after which this premix is added to 900 grams of octamethyltetrasiloxane to

  forming an emulsion having the consistency of a paste.

EXAMPLE 5

  An emulsion was formed using a 50:50 mixture of

  cyclic silicones comprising 450 grams of octamethyltetra-

247121C

  siloxane and 450 grams of decamethylpentasiloxane, which is

  incorporated in a premix emulsifier-water com

  taking 82 grams of polyoxyethylene-40, 57 gram-

  sorbitan monostearate and 280 grams of water. A silicone-water emulsion having the consistency was obtained

of a fat.

EXAMPLE 6

  To 900 grams of decamethylpentasiloxane was added a

  premix comprising 60 grams of sorbitan monostearate

  No. 200 grams of octylphenoxypolyethoxy 39 ethanol 70%, and 200 grams of water. In accordance with the method described in

  In Example 1, a silicone-water emulsion was obtained.

  so much the consistency of a soft dough.

EXAMPLE 7

  An antiperspirant was prepared by combining 100 grams

  of the silicone-water emulsion, paste of Example 4 and 20 gram

  aluminum chlorhydrate tablets in the form of Micr-Dry

Ultrafine (trademark of Releis Co).

EXAMPLE 8

  A product for the cooling of the skin was prepared by combining 100 grams of the silicone-water emulsion.

  paste of Example 6 with 0.25% perfume.

EXAMPLE 9

  A tanning lotion was formed by combining 100 grams of

  of the silicone-water emulsion in lotion of Example 2, 3.0%

of homosalate and 0.25% of perfume.

Claims (18)

  1. Process for the preparation of a silicone-water emulsion characterized in that it comprises the steps of mixing: (A) 100 parts by weight of a cyclic polysiloxane or a combination of cyclic polysiloxanes chosen from compounds corresponding to the general formula: wherein n represents an integer between 3 and 10, R is selected from the group consisting of -CH3, - (CH2) zCH3, -CH2CH2-CF3, -CH2 = CH2 , -C6H5, and combinations thereof, and z represents an integer from 1 to 10;   (B) from 0.7 to 666 parts by weight of an emulsifying agent   ing; and (C) from 5.0 to 960 parts by weight of water; and stirring, heating moderately until an emulsion is formed having the desired consistency.   2. Method according to claim 1, characterized in that 100 parts of cyclic polysiloxane are added to 15 to 1000 parts of a premix consisting of water and the emulsifying agent. 3. Process according to claim 2, characterized in that the water-emulsifying premix is heated to a temperature of between approximately 20 and 80 ° C. 4. Method according to claim 2, characterized in that   the water-emulsifying agent premix is prepared by lange of   (A) 100 parts by weight of one or more emulsifiers   selected from the group consisting of   ethoxylated fatty acids, ethoxylated and non-ethoxylated sorbitan   ethoxylates, alkylphenol ethoxylates, and ethers ethoxylated with, (B) 50 to 2000 parts by weight of water and heating to a temperature between about 20 and 80 C, up to   we get a homogeneous mixture.   5. Method according to claim 4, characterized in that   it still includes the addition of a bactericidal agent.   6. Silicone-water emulsion, characterized in that it comprises: (A) 100 parts by weight of a cyclic polysiloxane or of a combination of cyclic polysiloxanes chosen from the compounds corresponding to the general formula Si.on in which n represents an integer from 3 to 10, R is selected from the group consisting of -CH3,   - (CH2) zCH3 '-CH2CH2CF3, -CH2 = CH21-C6H5, and combinations thereof   son, and z represents an integer from 1 to 10;   (B) from 0.7 to 666 parts by weight of an emulsifying agent ing; and   (C) from 5.0 to 960 parts by weight of water.   Emulsion according to Claim 6, characterized in that 100 parts of 15-membered cyclic polysiloxane are added.   1000 parts of a premix of the water and the emulsifying agent   ing. 8. Emulsion according to claim 6, characterized in that the water and the emulsifying agent constitute a premix consisting of (i) 100 parts by weight of one or more emulsifiers selected from the group consisting of   ethoxylated fatty acids, ethoxylated sorbitan esters   ethoxylated alkylphenols, and ethoxylated ethers   and (ii) from 50 to 2000 parts by weight of water.   9. Emulsion according to claim 6, characterized in   it still includes a bactericidal agent.   Emulsion according to claim 6, characterized in that   what the silicone-water emulsion is a lotion.   11. Emulsion according to claim 6, characterized in   what the silicone-water emulsion is a cream or a paste.   Emulsion according to claim 6, characterized in that   what the silicone-water emulsion is an ointment or a gel.   13. Composition for the improvement of the epidermis   characterized in that it comprises (A) from 0.1 to 20,000 parts by weight of one or more epidermal enhancers contained in a vehicle composed of (B) 100 parts by weight of a silicone-water emulsion   according to any one of claims 6 to 12.   14.Composition according to claim 13, characterized in that it applies the improvement agent in the form a lotion.   15. Composition according to Claim 13, characterized   in that it is in the form of a paste.   16. Composition according to Claim 13, characterized   in that it is in the form of a cream.   17. Composition according to Claim 25, characterized   in that it is in the form of an ointment or a gel.   18. Process-application of a composition for improving   epidermis, characterized in that it consists of   to apply to the skin a composition according to any one than claims 13 to 17.