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EP1377255A4 - Nouvelles nanoemulsions - Google Patents

Nouvelles nanoemulsions

Info

Publication number
EP1377255A4
EP1377255A4 EP02728600A EP02728600A EP1377255A4 EP 1377255 A4 EP1377255 A4 EP 1377255A4 EP 02728600 A EP02728600 A EP 02728600A EP 02728600 A EP02728600 A EP 02728600A EP 1377255 A4 EP1377255 A4 EP 1377255A4
Authority
EP
European Patent Office
Prior art keywords
surfactant
nanoemulsion
group
salts
surfactants
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02728600A
Other languages
German (de)
English (en)
Other versions
EP1377255A1 (fr
Inventor
Liliana George
Charles C Tadlock
Peter J Tsolis
Raffi J Balian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Color Access Inc
Original Assignee
Color Access Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Color Access Inc filed Critical Color Access Inc
Publication of EP1377255A1 publication Critical patent/EP1377255A1/fr
Publication of EP1377255A4 publication Critical patent/EP1377255A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • A61K8/36—Carboxylic acids; Salts or anhydrides thereof
    • A61K8/361—Carboxylic acids having more than seven carbon atoms in an unbroken chain; Salts or anhydrides thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/04—Dispersions; Emulsions
    • A61K8/06—Emulsions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/04—Dispersions; Emulsions
    • A61K8/06—Emulsions
    • A61K8/062—Oil-in-water emulsions
    • 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
    • A61K8/36—Carboxylic acids; Salts or anhydrides thereof
    • A61K8/362—Polycarboxylic acids
    • 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
    • A61K8/375—Esters of carboxylic acids the alcohol moiety containing more than one hydroxy group
    • 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
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • 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
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/41—Amines
    • 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
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/41—Amines
    • A61K8/416—Quaternary ammonium compounds
    • 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
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/42—Amides
    • 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
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/44—Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof
    • 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
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/44—Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof
    • A61K8/442—Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof substituted by amido group(s)
    • 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
    • A61K8/46—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur
    • 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
    • A61K8/46—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur
    • A61K8/466—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur containing sulfonic acid derivatives; Salts
    • 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
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
    • A61K8/86—Polyethers
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y5/00—Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/20—Chemical, physico-chemical or functional or structural properties of the composition as a whole
    • A61K2800/21—Emulsions characterized by droplet sizes below 1 micron
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/41—Particular ingredients further characterized by their size
    • A61K2800/413—Nanosized, i.e. having sizes below 100 nm

Definitions

  • the invention relates to cosmetic and pharmaceutical formulations. More specifically, the invention relates to nanoemulsions which may be transparent or translucent, and contain low levels of emulsifiers.
  • Transparent emulsions can be prepared in the form of microemulsions, in which the dispersed phase is essentially solubihzed in the continuous phase by the action of a surfactant, and often, a cosurfactant. Rather than discrete isolated dispersed phase droplets, micelles comprising an inner core of the disperse phase material surrounded by a layer of surfactant are formed These systems upon formation are normally clear, forming very small micellar droplets, but ordinarily require fairly large quantities of surfactant. Normally, it is desirable to keep surfactant levels low in cosmetic compositions, however, because they can strip the skin of its natural hpid barrier, and thus leave the skin more susceptible to irritants.
  • a nanoemulsion is defined as an oil-m-water emulsion in which the size of the dispersed oil droplets is less than 100 nm.
  • Nanoemulsions provide an elegant, translucent or transparent vehicle that can be used for a variety of different product types.
  • the nanoemulsion is a system in very delicate balance, subject to disruption if the wrong component is added, and not ordinarily capable of taking on too much oil.
  • the known nanoemulsion systems may rely on the presence of relatively high levels of emulsifiers that are considered irritating, such as ethoxylated fatty ethers and esters.
  • a truly desirable nanoemulsion should retain its transparency or translucency, be able to accommodate a reasonable amount of additives, such as fragrance or actives, while remaining stable, and utilize a low level of non-imtatmg emulsifiers, so as to remain mild and gentle on the skin of the user.
  • the present invention provides such a nanoemulsion.
  • the present invention relates to stable oil-in-water nanoemulsions comprising as its principle emulsifier a ternary system of surfactants comprising a cationic, anionic and bridging surfactant.
  • the system is believed to provide a unique complex which, even when used at low levels, in combination with standard emulsion components, yields an attractive, translucent or transparent product that has a variety of possible uses.
  • the components of the ternary system are used in a molar ratio of approximately 1: >1: ⁇ 1 anionic: bridging: cationic, preferably with a range of up from about 1 : 1 :0.1 up to about 1 :3: 1, and also preferably with an overall approximately neutral charge.
  • the oil- in- water nanoemulsions of the invention are prepared in much the same way as are other nanoemulsions.
  • the aqueous phase may be any cosmetically acceptable water based material, such as deionized water, or a floral water.
  • the oil phase may be any cosmetically or pharmaceutically acceptable oil, such an oil being defined for the present purpose as any pharmaceutically or cosmetically acceptable material which is substantially insoluble in water.
  • the oils can perform different functions in the composition, the specific choice is dependent on the purpose for which it is intended.
  • the oils may be volatile or non-volatile, or a mixture of both.
  • suitable volatile oils include, but are not limited to, both cyclic and linear sihcones, such as octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane; or straight or branched chain hydrocarbons having from 8-20 carbon atoms, such as decane, dodecane, tridecane, tetradecane, and C8-20 isoparaffins.
  • Non-volatile oils include, but are not limited to, vegetable oils, such as coconut oil, jojoba oil, sunflower oil, palm oil, soybean oil; carboxylic acid esters such as isostearyl neopentanoate, cetyl octanoate, cetyl ⁇ cinoleate, octyl palmitate, dioctyl malate, coco-dicaprylate/caprate, decyl isostearate, my ⁇ styl my ⁇ state; animal oils such as lanolm and lanolin derivatives, tallow, mink oil or cholesterol; glyceryl esters, such as glyceryl stearate, glyceryl dioleate, glyceryl distearate, glyceryl lmoleate, glyceryl my ⁇ state; non-volatile sihcones, such as dimethicone, dimethiconol, dimethicone copolyol, phenyl trim
  • Water ordinarily will constitute from about 40-70% of the total emulsion, preferably about 50- 65%, while the oil is ordinarily about 5-30% and preferably about 10-20% of the emulsion as a whole
  • the ternary surfactant used is ordinarily added to the phase in which it is most compatible, using heat if necessary to accomplish better solubility or dispersibility, along with any active components which may be desired in the emulsion, and all components mixed together at low pressure.
  • the mixture is then subjected to high pressure mixing.
  • high pressure in the present context is meant a pressure of at least about 10,000 psi to about 20,000 psi; preferably about 11-17,000 psi.
  • the emulsion is subjected to at least two passes, more preferably at least three passes under high pressure. There is no upper limit to the number of passes, but there appears to be no major improvement to be achieved after about seven passes.
  • the preferred equipment is a microfluidizer, such as is available from Microfluidics. However, other suitable high pressure equipment is sold under the brand names Niro Soavi and Rannie.
  • the particle size distribution is normally narrow, and very small, less than lOOnm, preferably with an average size of about 30-50 nm.
  • a crucial element of the nanoemulsion is the ternary surfactant system used to emulsify the nanoemulsion.
  • the system comprises three essential elements, namely at least one anionic surfactant, at least one cationic surfactant and at least one bridging surfactant.
  • Systems of this type are available commercially as premade blends from Stepan Company, Northfield Illinois, identified as their C-A-N technology.
  • the component surfactants can be added to the emulsion separately, but more often will be preblended before addition.
  • cationic or anionic surfactants are pharmaceutically or cosmetically acceptable surfactants.
  • examples of such surfactants can be readily found, among other sources, in McCutcheon's Detergents and Emulsifiers, M.C. Publishing Company, North American Edition, 2000.
  • the cationic surfactant can be selected from among fatty amine salts, fatty diamine salts, polyamme salts, quaternary ammonium salts, or polyoxyethylenated fatty amine salts, or combinations thereof, with anions being selected from, among others, halogen, sulfate, methosulfate, ethosulfate, tosylate, acetate, phosphate, nitrate, sulfonate, and carboxylate.
  • the quaternary ammonium salts include mono-long chain alkyl-tri-short chain alkyl ammonium hahdes, wherein the long chain alkyl group has from about 8 to about 22 carbon atoms, and is derived from long chain fatty acids, and the short chain alkyl groups can be the same or different but preferably independently ethyl or methyl.
  • useful quaternary surfactants include, but are not limited to, cetyl trimethyl ammonium chloride, lauryl t ⁇ methyl ammonium chloride, cocamidopropyl PG-dimonium chloride phosphate, cet ⁇ monium bromide, cet ⁇ monium chloride, hydroxycetyl hydroxyethyl dimonium chloride, quaternium 52, PPG- 40 diethylmomum chloride, dicocodimomum chloride, behentrimonium chloride, quatern ⁇ um-26, quatern ⁇ um-60, isostearyl ethylimidazolmium ethosulfate, and dihydroxypropyl PEG-5 hneoleammonium chloride.
  • Useful salts of primary, secondary, and tertiary fatty amines include those having substituted or unsubstituted alkyl groups having from about 12 to about 22 carbon atoms.
  • Suitable salts include the halogen, acetate, phosphate, nitrate, citrate, lactate, and alkyl sulfate salts.
  • Amine salts derived from amine such as stearamido propyl dimethyl amine, diethyl ammo ethyl stearamide, dimethyl stearamine, dimethyl soyamine, soyamine, my ⁇ styl amine, tridecyl amine, ethyl stearylamme, N- tallow propane diamine, dihydroxy ethyl stearylamme, and arachidylbehenylamine, stearylamme hydrogen chloride, soyamine chloride, stearylamme formate, N-tallow propane diamine dichlonde and stearamidopropyl dimethylamine citrate
  • amine salt compounds include lmidazohnes, lmadazolmiums and py ⁇ dmiums, wherein the compound has at least one nonionic hydrophile containing radical, such as 2-heptadecyl-4.5-d ⁇ hydro- 1 H-
  • Anionic surfactants used in the present system are not limited in their nature, again however, preferably being pharmaceutically or cosmetically acceptable.
  • the anionic surfactants include, but are not limited to, sulfates, such as linear and branched primary and secondary alkyl sulfates, alkyl ethoxysulfates, alkyl ether sulfates, fatty oleyl glycerol sulfates, alkyl phenol ethyoxylated sulfates, alkyl phenol ethylene oxide ether sulfates, C5-C17 acyl-N-(Cl-C4 alkyl) and -N-(C1-C2 hydroxyalkyl)glucam ⁇ ne sulfates, and sulfates of alkylpolysaccha ⁇ des such as the sulfates of alkyl polyglucoside.; sulfonates such as salts of C5-C20 linear alkylbenzene
  • anionic surfactant is the material known as surfactm, a naturally occurring product produced by fermentation of certain strains of Bacillus subtihs, and is commercially available from Showa Denko, KK, Japan.
  • Preferred anionic surfactants, particularly for cosmetic purposes are alkylaryl sulfonates, alkylaryl sulfonic acids, carboxylated alcohols, carboxylic acids, diphenyl sulfonate derivatives, ethoxylated fatty acids, fluorocarbon-based surfactants, lsethionates, hgnm and derivatives, olefin sulfonates, phosphate esters, phosphorus organic derivatives, polysaccha ⁇ des, acrylic acids, and acrylamides, protein based surfactants, sarcosme, sulfates and sulfomcs of oils and fatty esters, sulfates and sulfomcs of ethoxylated alkylphenol
  • the bridging surfactants used in the present invention include semi-polar nonionic surfactants, ethoxamide surfactants, and amphoteric surfactants.
  • Semi-polar nonionic surfactants include, but are not limited to, water soluble amine oxides, and water soluble sulfoxides, having at least one CIO- 18 alkyl moiety, and at least one moiety selected from the group consisting of alkyl groups and hydroxyalkyl groups containing from about 1-3 carbon atoms, or amine- oxide derived surfactants.
  • Ethoxamides useful in the invention are ethoxylated alkanol amides or polyethylene glycol amides such as PEG-3 cocoamide or PEG-6 lauramide.
  • the bridging surfactant is an amphoteric surfactant.
  • Example of useful amphote ⁇ cs include, but are not limited to, alkyl glycinates, propionates, lmidazolmes, amphoalkylsulfonates, N-alkylammopropionic acids, N- alkylimmodipropionic acids, lmidazohne carboxylates, N-alkybetaines, amido propyl betames, sarcosmates, cocoamphocarboxyglycinates, amine oxides, sulfobetaines, or sultames.
  • Particularly preferred, especially for cosmetic use are the betame amphoteric surfactants, particularly amidopropyl betames.
  • the choice of components for the system is preferably based on a total HLB for the system of about 5-12, and preferably an overall substantially neutral charge.
  • the preferred combination of surfactants for cosmetic use is a glutamate as anionic surfactant, a quaternary ammonium salt as cationic surfactant, and an amidopropyl betaine as amphoteric. This combination is especially mild when applied to the skin and hair.
  • the ternary system is, in many embodiments, preferably used in a molar ratio of approximately 1 anionic: >1 bridging: 1 cationic.
  • the proportion of cationic surfactant can be reduced to ⁇ 1, in a range down to a level of about 0.1 up to less than 1, preferably in a range of from about 0.25 to about 0.5.
  • the ternary combination in the stated molar ratios, will be added to the composition in an amount ranging from about 0.5-5 % total surfactant, preferably 1-3% total surfactant, by weight of the total composition.
  • the combination will be added as a preblend, but each component can also be added separately to the composition.
  • each component is itself recognized as a surfactant, none of the components alone is adequate to achieve a stable nanoemulsion, all three must be used together.
  • the ternary system can be used alone, it is sometimes desirable to supplement the three main components with an additional small quantity of a secondary surfactant, preferably with an HLB of between about 3-5.
  • the secondary surfactant is a glyceryl fatty ester and derivatives thereof, such as glyceryl monostearate, glyceryl monolaurate, glyceryl monooleate, PEG 100 stearate, glycerol mono/distearate, polyglyceryl-2-stearate, fatty acid polyglycerol esters, hexaglycerol distearate, propylene glycol monolaurate and propylene glycol stearate.
  • secondary surfactants include hydroxylated lanolin, lanolin alcohol, ethoxylated castor oil, sorbitan monotallate, sorbitan monooleate, sorbitan sesquioleate, ethoxylated fatty amines, lecithin, oleth-2, palmitic/stea ⁇ c acid esters, distilled monoglyce ⁇ des, block copolymers of ethylene oxide and propylene oxide, cholesterol, dimethicone copolyol, and ethoxylated triglyce ⁇ des, Normally, the secondary surfactant will be used in an amount of from about 0 5-5%, preferably about 0 5-2%, by weight of the total composition
  • alcohols for example, short chain monohydric alcohols, such as ethanol or isopropanol, and/or polyhyd ⁇ c alcohols, such as butylene or propylene glycol, isopentyl diol, or amido-diols.
  • a monohydric alcohol is strongly preferred, in an amount of from about greater than zero, to about 30%, preferably about 5-25%, and most preferred, at least about 10%, by weight of the composition.
  • Polyhyd ⁇ c alcohols if used, will be used in an amount of from about greater than zero to about 10%, preferably about 1-5%, by weight of the total composition.
  • compositions with active agents or additives appropriate to the intended use.
  • active agents or additives appropriate to the intended use.
  • the preferred use of the compositions are as pharmaceutical or cosmetic vehicles, for application to the skin or hair.
  • the nanoemulsions of the invention in part because of the presence of the cationic surfactant, provide a very efficient delivery system for a wide variety of active components.
  • the formulations are highly substantive to skin and hair, the emulsifying system exhibits a substantial degree of water resistance, and also potentially contributes to the preservation of the formulation as a whole .
  • additional components include, but are not limited to, agents for the eradication of age spots, keratoses and wrinkles, analgesics, anesthetics, anti-acne agents, antibacte ⁇ als, antiyeast agents, antifungal agents, antiviral agents, antidandruff agents, antidermatitis agents, antipru ⁇ tic agents, antiemetics, antimotion sickness agents, anti-inflammatory agents, antihyperkeratolytic agents, anti-dry skin agents, antiperspirants, antipsonatic agents, antiseborrheic agents, hair conditioners and hair treatment agents, antiaging agents, antiwrmkle agents, antiasthmatic agents and bronchodilators, sunscreen agents, antihistamine agents, skin lightening agents, depigmenting agents, vitamins, corticosteroids, self-tanning agents, hormones, retmoids such as retinoic acid and retinol, topical cardiovascular agents, clotnmazole, ketoconazole,
  • non-therapeutic or non-active agents such as emollients, flavors, colorants, fragrances, gellants, thickeners, sunscreens, and the like, which enhance the ultimate use of the product, particularly for topical cosmetic or pharmaceutical purposes, and provided care is taken to avoid choosing components that will interfere with the clarity of the product.
  • the final product can take the form of a milk, cream, lotion, gel, serum, or liquid spray, among others.
  • a particularly interesting use of the nanoemulsions of the invention is in the preparation of sunscreen formulations. It has been difficult to achieve a translucent product with the addition of sunscreens to other types of nanoemulsions.
  • the nanoemulsions of the invention may therefore incorporate one or more sunscreen agents, such as benzophenones, avobenzone, cmnamates, sahcylates, and the like.
  • a nanoemulsion of the following composition is prepared:
  • the components above are combined as follows: The water phase components (Phase I) are heated to 65°C, and the oil phase components (Phase II) are heated to 75°C When both phases have reached the proper temperature, the oil phase is added to the water phase under a Silverson homogenizer at about 5000-6000 rpm. This batch is then passed through a microfluidizer once, at a pressure of about 13,000-17,000 psi. The Phase III components are added under the Silverson homogenizer at about 5000-6000 rpm, and then the entire product is passed through a microfluidizer three more times. The resulting product is a translucent nanoemulsion which is stable for at least 4 weeks at 50°C.
  • Additional nanoemulsions are prepared using the following surfactant blends(all QS water to 100%):
  • a sunscreen-containing nanoemulsion is prepared as follows:
  • the formula described above is prepared as follows: The water phase and surfactant blend are heated to 65°C. The oil phase is heated to 75°C, and homogenized into the water. The mixture is passed through the microfluidizer once, and cooled to 30°C Phases III and IV are added in sequence, then phase V is added. The resulting mixture is then passed through the microfluidizer as described in Example 1.

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  • Biophysics (AREA)
  • Cosmetics (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Abstract

L'invention concerne des nanoémulsions huile dans l'eau comprenant comme tensioactif primaire un système ternaire qui renferme au moins un tensioactif anionique, cationique et de formation de ponts, de préférence dans un rapport molaire de 1:≥1:≤1, une charge globale étant sensiblement neutre. Les nanoémulsions peuvent être translucides ou transparentes, et fournir un excipient substantif et hydrorésistant utilisé dans une application de cosmétique, de soins pour la peau ou de produits pharmaceutiques pour la peau ou les cheveux.
EP02728600A 2001-03-30 2002-03-29 Nouvelles nanoemulsions Withdrawn EP1377255A4 (fr)

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US28070001P 2001-03-30 2001-03-30
US280700P 2001-03-30
PCT/US2002/009630 WO2002080864A1 (fr) 2001-03-30 2002-03-29 Nouvelles nanoemulsions

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EP1377255A1 EP1377255A1 (fr) 2004-01-07
EP1377255A4 true EP1377255A4 (fr) 2008-11-19

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AU (1) AU2002258644B2 (fr)
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WO (1) WO2002080864A1 (fr)

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EP1377255A1 (fr) 2004-01-07
JP4444565B2 (ja) 2010-03-31
CA2442660A1 (fr) 2002-10-17
JP2004532214A (ja) 2004-10-21
WO2002080864A1 (fr) 2002-10-17
AU2002258644B2 (en) 2006-12-14

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