Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
  • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
  • C07D413/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings directly linked by a ring-member-to-ring-member bond
• • 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
  • A61K8/11—Encapsulated compositions
• • 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
  • A61K8/58—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing atoms other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur or phosphorus
  • A61K8/585—Organosilicon compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
  • A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
  • B01J13/02—Making microcapsules or microballoons
  • B01J13/06—Making microcapsules or microballoons by phase separation
  • B01J13/14—Polymerisation; cross-linking
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C225/00—Compounds containing amino groups and doubly—bound oxygen atoms bound to the same carbon skeleton, at least one of the doubly—bound oxygen atoms not being part of a —CHO group, e.g. amino ketones
  • C07C225/22—Compounds containing amino groups and doubly—bound oxygen atoms bound to the same carbon skeleton, at least one of the doubly—bound oxygen atoms not being part of a —CHO group, e.g. amino ketones having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
  • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
  • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D213/24—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
  • C07D213/54—Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
  • C07D213/57—Nitriles
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
  • C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
  • C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
  • C07D235/18—Benzimidazoles; Hydrogenated benzimidazoles with aryl radicals directly attached in position 2
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D249/00—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
  • C07D249/16—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms condensed with carbocyclic rings or ring systems
  • C07D249/18—Benzotriazoles
  • C07D249/20—Benzotriazoles with aryl radicals directly attached in position 2
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
  • C07D263/52—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings condensed with carbocyclic rings or ring systems
  • C07D263/54—Benzoxazoles; Hydrogenated benzoxazoles
  • C07D263/56—Benzoxazoles; Hydrogenated benzoxazoles with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached in position 2
  • C07D263/57—Aryl or substituted aryl radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
  • C07D309/34—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic System
  • C07F7/02—Silicon compounds
  • C07F7/08—Compounds having one or more C—Si linkages
  • C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
  • C07F7/1804—Compounds having Si-O-C linkages
• • 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
  • A61K2800/412—Microsized, i.e. having sizes between 0.1 and 100 microns
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
  • Y10T428/2984—Microcapsule with fluid core [includes liposome]
  • Y10T428/2985—Solid-walled microcapsule from synthetic polymer
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
  • Y10T428/2989—Microcapsule with solid core [includes liposome]

Definitions

• the present invention relates to novel UV filters on the basis of microcapsules, a process for the preparation and their use especially in formulations for the protection against harmful effects of sunlight.
• UV-A 320 to 400 nm
• UV-B 290-320 nm
• UV-C shorter wavelength
• UV filters used in sunscreen compositions are monomeric compounds e, and thus there is the inherent risk that such compounds can penetrate the skin barrier, which is highly undesirable.
• UV filters on the basis of polysiloxanes which may be either linear or cyclic are described e.g. in WO 93/04665, WO 94/06404, EP-A 538 431, EP-A 392 883 and EP-A 358 584. With these polysiloxanes the risk of skin penetration is lower, but it is sometimes difficult to incorporate the polysiloxanes in sunscreen compositions due to incompatibility problems which differ depending on the UV-active chromophores which are covalently bonded to the polysiloxanes.
• UV filters tend to interact, which in some cases in which a sunscreen composition contains more than one type of UV filter, leads to a situation where the UV filter activity of one or both of the UV filters is reduced during storage or after being applied to the skin.
• Attempts have been made to solve this problem by encapsulating one type of UV filter or two or more types of UV filter which are present in a sunscreen composition in order to minimize the contact of the UV filters during storage and when applied to the skin.
• Microcapsules are disclosed which release the UV filters over time, others are designed to permanently encapsulate the UV filter. Encapsulation technologies are described e.g.
• Some of these microencapsulated UV filters are designed to release the UV filter from the microcapsules in a controlled manner in order to maintain a constant concentration of the UV filter in the sunscreen composition.
• the active UV filters in the sunscreen compositions are still highly movable monomeric compounds which have the inherent risk of penetrating the skin after application.
• microcapsules are designed which should permanently encapsulate the UV filters and those microcapsules are often prepared by a sol-gel process.
• a sol-gel process it is difficult to prepare microcapsules which do not leak the UV filters, and in practice it has been shown that the interaction between the UV filters can be reduced by encapsulating them e.g. with a sol-gel process, but this only slows down the inactivation of the UV filters but does not sufficiently prevent it.
• WO 98/31333 discloses sunscreen doped sol-gel materials which are useful for protecting body tissue and other surfaces from sunlight radiation.
• the sol-gel materials are prepared by encapsulating UV filter chromophores by a sol-gel process. It is also disclosed that the monomers which are used for encapsulating the chromophores can be compounds of a general formula M(R) n (P) m , wherein M is a metallic or semi-metallic element, R is a hydrolysable substituent, n is an integer from 2 to 6, P is a non-polymerizable substituent or sunscreening moiety and m is an integer from 0 to 6.
• this document considers the possibility to use monomers for the formulation of the matrix of the microcapsules which in themselves have sunscreening activity (without disclosing any example of such a monomer). However, these monomers are still used to form a matrix which encapsulates monomeric chromophores which are not covalently bonded to the matrix material and in all processes for producing microcapsules disclosed in this document monomeric non-polymerizable chromophores are encapsulated by the sol-gel process.
• microcapsules disclosed in WO 98/31333 all comprise encapsulated chromophores which are not chemically bonded to the matrix material, and it was obviously believed that it is not possible to provide microcapsules with sufficient sunscreen activity, if no chromophores are encapsulated within the microcapsules. Accordingly, the microcapsules disclosed in WO 98/31333 still show the problems discussed above.
• EP-A 1 205 178 and EP-A 1 205 177 suggest to reduce the risk of penetration of active ingredients such as UV filters into the skin and possible damage of the skin or allergies caused thereby by immobilizing the active ingredients or UV filters present in a dermatological or cosmetic composition.
• These documents disclose a conjugate which comprises an anorganic pigment and an active ingredient on the basis of an organic compound which is covalently bonded via a spacer group to the anorganic pigment.
• the conjugate disclosed in these documents thus contains an anorganic pigment and to the surface of this pigment chromophores are chemically bonded.
• the problem to be solved by the present invention is the provision of novel UV filters which do not show the shortcomings of the prior art as described above.
• the UV filters should have excellent UV filter activity, be easily accessible and compatible with the other usual ingredients of cosmetic and dermatological compositions.
• a new type of UV filters which is in the form of microcapsules and obtainable by a process, wherein at least one type of crosslinkable monomer with UV-A and/or UV-B and/or UV-C filter activity and optionally at least one type of crosslinkable monomer which does not have UV-A and/or UV-B and/or UV-C filter activity are subjected to a crosslinking reaction in the absence of non-crosslinkable chromophores with UV-A and/or UV-B and/or UV-C filter activity.
• microcapsules which exclusively comprise chromophores with UV filter activity which are covalently bonded to the polymer matrix of the microcapsule have sufficient UV filter activity and that it is not necessary to dope these microcapsules with additional monomeric chromophores which are not covalently bonded to the polymeric matrix material but encapsulated in the microcapsules. Therefore, the microcapsules of the present invention do not comprise encapsulated monomeric chromophores with UV filter activity, but all chromophores which are present in the microcapsules of the present invention are covalently bonded to the polymer which forms the matrix material.
• UV filter activity encompasses UV-A, UV-B and UV-C filter activity, preferably UV-A and UV-B filter activity. If the term “UV filter” or “UV filter activity” is used without further explanation, it refers to compounds or compositions or moieties which have either UV-A or UV-B or UV-C filter activity as well as to compounds or compositions or moieties which have both UV-A and UV-B filter activity and to compounds or compositions or moieties which have UV-A, UV-B and UV-C filter activity and to compounds or compositions or moieties which have both UV-B and UV-C filter activity. Preferably, the term “UV filter” or “UV filter activity” is used for compounds, compositions or moieties which have UV-A or UV-B filter activity or for compounds, compositions or moieties which have both UV-A and UV-B filter activity.
• the present invention is also directed to the process for producing these novel microcapsules with UV filter activity, to sunscreen compositions comprising the microcapsules and to the use of the microcapsules for producing a sunscreen composition.
• the present invention employs methods of preparing microcapsules which are well known in the art and which have in the past been used to prepare encapsulated UV filters.
• all compounds with UV filter activity are covalently bonded to the monomers which form the matrix of the microcapsules.
• the novel UV filters in the form of microcapsules combine several advantages which could not be achieved with the UV filters of the prior art. In particular a leakage of the monomeric UV filters causing the risk of penetration into the skin and allergic reactions or skin diseases no longer exists.
• microcapsules of the present invention An important feature of the microcapsules of the present invention and the process for producing them is that no monomeric non-crosslinkable chromophores having UV filter activity are present during the formation of the microcapsules, e.g. during the sol-gel process. Thus, it is ensured that all chromophores with UV filter activity which are present in the so prepared microcapsules are covalently bonded to the polymeric matrix of the microcapsules. There might be a minor amount of contamination by unreacted crosslinkable chromophores which is not relevant for the invention and should be avoided as far as possible.
• the microcapsules of the present invention do not contain any unreacted crosslinkable chromophores with UV filter activity.
• crosslinkable chromophores with UV filter activity are novel compounds, and the present invention is also directed to those crosslinkable chromophores.
• crosslinkable chromophore with UV filter activity is not particularly limited. Most preferred are chromophores of the formula M(R) n (P) m (Q) q ,
• M is silicon
• R has not more than 10 carbon atoms and is an alkoxide, an aryloxide or an acyloxy group, more preferably an alkoxide or an acyloxy group with not more than 10 carbon atoms, in particular a C 1 -C 6 alkoxide such as a methoxide or an ethoxide
• n is an integer of 2 or 3
• P is a residue A with UV-A and/or UV-B filter activity which is chemically bonded to M usually by a spacer group (P is the combination of A and the spacer group) and m is 1.
• the spacer group has preferably 1 to 10 carbon atoms and optionally 1 to 3 hetero atoms such as nitrogen or oxygen atoms and is preferably of the formula —(B) b (C) c (D) d (E) e — as defined above.
• crosslinkable chromophores with UV filter activity is within the knowledge of the skilled person who knows the present specification, and some preferred examples are generally disclosed in the following:
• residue A is the part of the residue P which provides the UV filter activity
• residue P usually consists of a residue A and optionally a spacer group which is used for coupling the residue A to the metal or semi-metal M, in particular to the silicon, index o is 0 to 6, preferably 0, 1, 2 or 3.
• the residues A are preferably known UV light absorbers, and these known UV light absorbers are modified preferably by a functional silanes such as methyldichlorosilane, trichlorosilane, triethoxysilane, 3-(isocyanatopropyl)triethoxysilane, or 3-(chloropropyl)-triethoxysilane or 3-(aminopropyl)-triethoxysilane without being limited thereto e.g. by a functional silanes such as methyldichlorosilane, trichlorosilane, triethoxysilane, 3-(isocyanatopropyl)triethoxysilane, or 3-(chloropropyl)-triethoxysilane or 3-(aminopropyl)-triethoxysilane without being limited thereto e.g. by
• CPTEOS 3-(chloropropyl)-triethoxysilane
• the UV-light absorbing groups A covalently bonded to the microcapsules comprise all groups which absorb light in the range of wavelengths 400-320 nm (UVA) and 320-290 (UVB) or of even shorter wavelengths (UVC) and which are or can be used as chemical UV filters.
• These groups are, e.g., residues of compounds belonging to the groups of acrylates, p-aminobenzoates, camphor derivatives (such as of benzylidene camphor type), cinnamates, benzophenones, esters of benzalmalonic acid, esters of 2-(4-ethoxy anilinomethylene)propandioic, imidazole derivatives, salicylates, triazone derivatives, triazol derivatives, dibenzoylmethanes, amino substituted hydroxybenzophenones, phenyl-benzimidazoles, anthranilates, phenyl-benzoxazoles, 1,4-dihydropyranes and others representing state of the art and known to those skilled in the art to be highly active.
• acrylates examples include 2-ethylhexyl 2-cyano-3,3-diphenylacrylate (octocrylene, PARSOL® 340) and ethyl 2-cyano-3,3-diphenylacrylate;
• Examples for p-aminobenzoates include 4-amino benzoic acid, 4-aminobenzoic acid-2,3-dihydroxypropylester, 4-(bis(2-hydroxypropyl)amino)benzoic acid ethyl ester, 4-(dimethylamino)benzoic acid-2-ethylhexylester (e.g. Eusolex® 6007) and ethoxylated 4-aminobenzoic acid ethyl ester (e.g. Uvinul® P25).
• camphor derivatives include 4-methyl benzylidene camphor (PARSOL® 5000), 3-benzylidene camphor, camphor benzalkonium methosulfate, polyacrylamidomethyl benzylidene camphor, sulfo benzylidene camphor, sulphomethyl benzylidene camphor and therephthalidene dicamphor sulfonic acid;
• cinnamates examples include octyl methoxycinnamate (PARSOL® MCX), ethoxyethyl methoxycinnamate, diethanolamine methoxycinnamate (PARSOL® Hydro) and isoamyl methoxycinnamate.
• benzophenones examples include benzophenone-3, benzophenone-4,2,2′,4,4′ tetrahydroxy-benzophenone and 2,2′Dihydroxy-4,4′dimethoxybenzophenone;
• esters of benzalmalonic acid include di(2-ethylhexyl) 4-methoxybenzalmalonate
• esters of 2-(4-ethoxy anilinomethylene)propandioic acid examples include 2-(4-ethoxy anilinomethylene)propandioic acid diethyl ester as described in the European Patent Publication EP 0895 776
• imidazole derivatives examples include 2-phenyl benzimidazole sulfonic acid and its salts (PARSOL®HS).
• Salts of 2-phenyl benzimidazole sulfonic acid are e.g. alkali salts such as sodium- or potassium salts, ammonium salts, morpholine salts, salts of primary, sec. and tert. amines like monoethanolamine salts and diethanolamine salts.
• salicylate derivatives include isopropylbenzyl salicylate, benzyl salicylate, butyl salicylate, octyl salicylate (NEO HELIOPAN OS), isooctyl salicylate or homomenthyl salicylate (homosalate, HELIOPAN);
• triazone derivatives examples include octyl triazone (UVINUL T-150), dioctyl butamido triazone (UVASORB HEB).
• triazol derivatives examples include benzotriazoles such as 2-(2-hydroxy-5-methylphanyl)benzotriazol, 2,2′-methylene-bis-(6-(2H-benzotriazole-2-yl)-4-(1,1,3,3,-tetramethylbutyl)-phenol (TINOSORB M) as well as triazols described in EP-A-893119
• dibenzoylmethane derivatives include compounds such as 4-tert. butyl-4′-methoxydibenzoyl-methane (PARSOL® 1789), dimethoxydibenzoylmethane and isopropyldibenzoylmethane;
• Amino substituted hydroxybenzophenones include compounds such as 2-(4-Diethylamino-2-hydroxy-benzoyl)-benzoic acid hexyl ester as described in the European Patent Publication EP 1046391.
• Cinnamic acid or benzalmalonate derivatives such as
• Octocrylene derivatives such as
• tert-Butyldibenzoylmethane derivatives such as wherein R′ is hydrogen, hydroxy, straight or branched chain C 1-20 -alkyl, -alkoxy or C 2-20 -alkenyl.
• the crosslinkable chromophore with UV filter activity is obtainable by reacting a silane molecule, e.g. of the formula Si(R) r (Q) q S, wherein R is a hydrolysable group as defined above, in particular an alkoxy group or an acyloxy group with 10 carbon atoms or less, Q is a non-hydrolysable group as defined above, in particular a C 1 -C 6 alkyl group, e.g.
• S is a reactive group which can react with the chromophore, in particular a hydrogen atom, a group —(CH 2 ) o —NCO, a group —(CH 2 ) o —Cl or a group —(CH 2 ) o —NH 2 , r is 2 or 3, q is 0 or 1 and o is 1 to 6, such as wherein Alk is a C 1 -C 6 alkyl group, preferably methyl or ethyl, and a corresponding molecule with a chromophore selected e.g. from wherein R′ is hydrogen, hydroxy, straight or branched chain C 1-20 -alkyl, -alkoxy or C 2-20 -alkenyl without being limited thereto.
• the crosslinkable chromophores by polymerizing one or more of the hydrolysable metal or semi-metal compounds, in particular the silane compounds mentioned above with each other or with other monomers such as the crosslinkable monomers with no UV filter activity defined below.
• the crosslinkable chromophore is an oligomer which comprises one or more of the UV filter active moieties A.
• oligomer is constituted from 50 monomer units or less, preferably from 20 monomer units or less, more preferably of 10 monomer units or less.
• such an oligomeric crosslinkable chromophore comprises 5 or less UV filter active moieties A, more preferably 3 or less, most preferably 1 UV filter active moiety A.
• the crosslinkable chromophores with UV filter activity can be subjected to a crosslinking reaction per se or they can be subjected to a crosslinking reaction in the presence of crosslinkable monomers which do not have UV filter activity.
• the crosslinkable chromophores with UV filter activity are subjected to a crosslinking reaction with crosslinkable monomers without UV filter activity, because this easily allows to adjust the amount of UV filter active moieties in the final microcapsules.
• the crosslinkable monomers with no UV filter activity are preferably compounds of the formula M(R) n (Q) q , wherein M is a metallic or semi-metallic element such as silicon, titanium, zinc, aluminum or zirconium, preferably silicon, R is a hydrolysable substituent as defined above, preferably with not more than 10 carbon atoms, such as an alkoxide, an aryloxide, carboxylic ester, acyloxy group, diketonato group, hydrolysable aza group or a chlorine atom, preferably an alkoxide, an aryloxide or an acyloxy group, more preferably an alkoxide or an aryloxy group with 10 carbon atoms or less, in particular a C 1 -C 6 alkoxide, most preferably methoxide or ethoxide, and n is an integer from 2 to 4, preferably 3 or 4, most preferably 4.
• crosslinkable monomers such as tetraethoxysilane (TEOS), tetramethoxysilane (TEMOS), methyltriethoxysilane (METEOS) or partially hydrolyzed and/or partially condensed polymers (oligomers) thereof or a mixture of the above.
• TEOS tetraethoxysilane
• TEMOS tetramethoxysilane
• METEOS methyltriethoxysilane
• Suitable crosslinkable monomers are also disclosed e.g. in EP-A 216 278, and the other documents listed below which disclose details of the sol-gel process and which are incorporated herein by reference.
• the method for producing the microcapsules of the present invention is not particularly limited and all methods which are well known to a skilled person can principally be used, it is preferred to prepare the microcapsules by a sol-gel process, in particular if the crosslinkable monomers are metallic or semi-metallic compounds as defined above.
• the sol-gel process for producing microcapsules is well known to a skilled person.
• the crosslinkable monomers preferably the silanes with and without UV filter activity as defined above are e.g.
• the obtained emulsion is mixed with an aqueous solution at a suitably selected pH value (basic, neutral or acidic) until spheres are formed.
• the spheres are then crosslinked under the formation of Si—O—Si bonds, e.g. by applying heat or changing the pH value, and a three-dimensional network is formed.
• the details of this process are well known, and it can be referred e.g.
• EP-A 216 278, WO 98/31333, U.S. Pat. No. 6,303,149, EP-A 281 034 and EP-A 941 761 the content of which regarding the sol-gel process is incorporated herein by reference.
• Particularly preferred are the processes disclosed in EP-A 216 278 and U.S. Pat. No. 6,303,149, the content of which is incorporated herein by reference.
• a particularly preferred process is also disclosed in the examples.
• the preparation of the microcapsules of the present invention by the sol-gel process has the advantage that the product obtained by this process is already in the form of a suspension containing about 1 to 80% solids consisting of sphere particles of 0.01-10 ⁇ m which can directly be used in the pharmaceutical compositions of the present invention. If advantageous, the product can also be dried and the product be used in the form of a dried powder.
• the microcapsules of the present invention have a particle size of 0.01-100 ⁇ m, more preferably of 0.01-10 ⁇ m.
• the amount of UV filter active moieties in the microcapsules is 10 to 80% w/w, more preferably 25 to 50% w/w.
• the above percentages relate to the weight of the UV filter active moieties A in the matrix material and are based on the total weight of the matrix material.
• the particle size is a mean particle size d v (0.5), if nothing else is stated.
• the microcapsules of the present invention contain two or more types of chromophores without the risk that there is an inactivation between the chromophore moieties, because the chromophore moieties are covalently bonded to the matrix material and therefore the risk of contact between the chromophore moieties is low.
• one or two kinds of crosslinkable chromophores are subjected to the crosslinking reaction, in particular the sol-gel process, most preferably together with at least one kind of crosslinkable monomer which does not have any UV filter activity.
• microcapsules of the present invention thus preferably contain one or two different kinds of UV filter active moieties A as defined above, in a preferred embodiment only one kind of chromophore moieties as defined above in a ratio of 1:10 to 10:1, more preferably of 7:3 to 3:7, and in particular of about 1:1 to the crosslinkable monomer which does not have any UV filter activity.
• the ratio is based on a weight by weight basis.
• the microcapsules of the present invention can be included within sunscreen compositions in manners well known to a skilled person.
• the sunscreen compositions are generally topical sunscreen compositions.
• the sunscreen compositions which are prepared with the microcapsules of the present invention have an excellent sunprotective factor which decrease only slightly if at all during storage or after being applied to the skin, even if two or more different UV filter active components are present which would usually inactivate each other.
• microcapsules carrying a covalent bonded UV-filter can be incorporated in auxiliary agents, e.g. a cosmetic base, which are conventionally used for such formulations.
• auxiliary agents e.g. a cosmetic base
• other conventional UV-A and/or UV-B and/ or broad spectrum screening agents may also be added.
• the combination of UV screens may show a synergistic effect.
• the amount of the microcapsules carrying a covalently bonded UV-filter and other known UV-screens is not critical.
• Suitable amounts of the microcapsules carrying a covalently bonded UV-filter are about 10 to about 50% by weight (depending on the payload and volume fraction of the microcapsules) and about 0.5-12% by weight of at least one additional, hydrophilic and/or lipophilic UV-A or UV-B or broad spectrum screening agent.
• additional screening agents are advantageously selected from among the compounds listed below without being limited thereto:
• UV B or broad spectrum screening agents i.e. substances having absorption maximums between about 290 and 340 nm, which come into consideration for combination with the compounds of the present invention are for example the following organic and inorganic compounds:
• esters of Benzalmalonic acid such as di-(2-ethylhexyl) 4-methoxybenzalmalonate
• Examples of broad spectrum or UV A screening agents i.e. substances having absorption maximums between about 320 and 400 nm, which come into consideration for combination with the compounds of the present invention are for example the following organic and inorganic compounds:
• conventional UV-A screening agent also refers to dibenzoylmethane derivatives such as e.g. PARSOL® 1789 stabilized by, e.g.,
• compositions of the invention can also contain usual cosmetic adjuvants and additives, such as preservatives/ antioxidants, fatty substances/ oils, water, organic solvents, silicones, thickeners, softeners, emulsifiers, additional sunscreens, antifoaming agents, moisturizers, fragrances, surfactants, fillers, sequestering agents, anionic, cationic, nonionic or amphoteric polymers or mixtures thereof, propellants, acidifying or basifying agents, dyes, colorants, pigments or nanopigments, in particular those suited for providing an additional photoprotective effect by physically blocking out ultraviolet radiation, or any other ingredients usually formulated into cosmetics, in particular for the production of sunscreen/antisun compositions.
• the necessary amounts of the cosmetic and dermatological adjuvants and additives can, based on the desired product, easily be chosen by a skilled artisan in this field and will be illustrated in the examples, without being limited hereto.
• antioxidants/preservatives are generally preferred. Based on the invention all known antioxidants usually formulated into cosmetics can be used. Especially preferred are antioxidants chosen from the group consisting of amino acids (e.g. glycine, histidine, tyrosine, tryptophan) and their derivatives, imidazole (e.g. urocanic acid) and derivatives, peptides such as D,L-carnosine, D-carnosine, L-carnosine and derivatives (e.g. anserine), carotenoids, carotenes (e.g.
• amino acids e.g. glycine, histidine, tyrosine, tryptophan
• imidazole e.g. urocanic acid
• peptides such as D,L-carnosine, D-carnosine, L-carnosine and derivatives (e.g. anserine)
• carotenoids e.g.
• ⁇ -carotene, ⁇ -carotene, lycopene and derivatives, chlorogenic acid and derivatives, lipoic acid and derivatives (e.g. dihydrolipoic acid), aurothioglucose, propylthiouracil and other thiols (e.g.
• thioredoxine glutathione, cysteine, cystine, cystamine and its glycosyl-, N-acetyl-, methyl-, ethyl-, propyl-, amyl-, butyl- and lauryl-, palmitoyl-; oleyl-, y-linoleyl-, cholesteryl- and glycerylester) and the salts thereof, dilaurylthiodipropionate, distearylthiodipropionate, thiodipropionic acid and its derivatives (ester, ether, peptides, lipids, nucleotides, nucleosides and salts) as well as sulfoximine compounds (such as buthioninsulfoximine, homocysteinsulfoximine, buthioninsulfone, penta-, hexa-, heptathioninsulfoximine) in very low compatible doses (e.g.
• ⁇ -hydroxyfatty acids palmic-, phytinic acid, lactoferrin
• ⁇ -hydroxyacids such as citric acid, lactic acid, malic acid
• huminic acid gallic acid
• gallic extracts bilirubin, biliverdin, EDTA, EGTA and its derivatives
• unsaturated fatty acids and their derivatives such as ⁇ -linoleic acid, linolic acid, oleic acid
• folic acid and its derivatives ubiquinone and ubiquinol and their derivatives
• vitamin C and derivatives such as ascorbylpalmitate and ascorbyltetraisopalmitate
• Mg-ascorbylphosphate Na-ascorbylphosphate, ascorbylacetate
• tocopherole and derivates such as vitamin-E-acetate
• vitamin E vitamin E, vitamin A and derivatives (vitamin-A-palmitate and -acetate) as well as coniferylbenzoat, rutinic acid and derivatives, ⁇ -glycosylrutin, ferulic acid, furfurylidenglucitol, carnosin, butylhydroxytoluene, butylhydroxyanisole, trihydroxybutyrophenone, urea and its derivatives, mannose and derivatives, zinc and derivatives (e.g. ZnO, ZnS0 4 ), Selen and derivatives (e.g.
• One or more preservatives/antioxidants may be present in an amount about 0.01 wt. % to about 10 wt. % of the total weight of the composition of the present invention. Preferably, one or more preservatives/antioxidants are present in an amount about 0.1 wt. % to about 1 wt. %.
• formulations also contain surface active ingredients like emulsifiers, solubilizers and the like.
• An emulsifier enables two or more immiscible components to be combined homogeneously. Moreover, the emulsifier acts to stabilize the composition.
• Emulsifiers that may be used in the present invention in order to form O/W, W/O, O/W/O or W/O/W emulsions/microemulsions include sorbitan oleate, sorbitan sesquioleate, sorbitan isostearate, sorbitan trioleate, polyglyceryl-3-diisostearate, polyglycerol esters of oleic/isostearic acid, polyglyceryl-6 hexaricinolate, polyglyceryl-4-oleate, polygylceryl-4 oleate/PEG-8 propylene glycol cocoate, oleamide DEA, TEA myristate, TEA stearate, magnesium stearate, sodium stearate, potassium laurate, potassium ricinoleate, sodium cocoate, sodium tallowate, potassium castorate, sodium oleate, and mixtures thereof.
• emulsifiers are phosphate esters and the salts thereof such as cetyl phosphate (Amphisol® A), diethanolamine cetyl phosphate (Amphisol®), potassium cetyl phosphate (Amphisol® K), sodium glyceryl oleate phosphate, hydrogenated vegetable glycerides phosphate and mixtures thereof.
• one or more synthetic polymers may be used as an emulsifier.
• PVP eicosene copolymer acrylates/C 10-30 alkyl acrylate crosspolymer, acrylates/steareth-20 methacrylate copolymer, PEG-22/dodecyl glycol copolymer, PEG-45/dodecyl glycol copolymer, and mixtures thereof.
• the preferred emulsifiers are cetyl phosphate (Amphisol® A), diethanolamine cetyl phosphate (Amphisol®), potassium cetyl phosphate (Amphisol® K), PVP Eicosene copolymer, acrylates/C 10-30 -alkyl acrylate crosspolymer, PEG-20 sorbitan isostearate, sorbitan isostearate, and mixtures thereof.
• the one or more emulsifiers are present in a total amount about 0.01 wt. % to about 20 wt. % of the total weight of the composition of the present invention. Preferably, about 0.1 wt. % to about 10 wt. % of emulsifiers are used.
• oils such as triglycerides of caprinic acid or caprylic acid, preferable castor oil;
• esters of fatty acids with alcohols e.g. isopropanol, propyleneglycol, glycerine or esters of fatty alcohols with carbonic acids or fatty acids;
• alkylbenzoates and/or
• silicone oils such as dimethylpolysiloxane, diethylpolysiloxane, diphenylpolysiloxane, cyclomethicones and mixtures thereof.
• Exemplary fatty substances which can be incorporated in the oil phase of the emulsion, microemulsion, oleo gel, hydrodispersion or lipodispersion of the present invention are advantageously chosen from esters of saturated and/or unsaturated, linear or branched alkyl carboxylic acids with 3 to 30 carbon atoms, and saturated and/or unsaturated, linear and/or branched alcohols with 3 to 30 carbon atoms as well as esters of aromatic carboxylic acids and of saturated and/or unsaturated, linear or branched alcohols of 3-30 carbon atoms.
• esters can advantageously be selected from octylpalmitate, octylcocoate, octylisostearate, octyldodecylmyristate, cetearylisononanoate, isopropylmyristate, isopropylpalmitate, isopropylstearate, isopropyloleate, n-butylstearate, n-hexyllaureate, n-decyloleat, isooctylstearate, isononylstearate, isononylisononanoate, 2-ethyl hexylpalmitate, 2-ethylhexyllaurate, 2-hexyldecylstearate, 2-octyldodecylpalmitate, stearylheptanoate, oleyloleate, oleylerucate, erucylo
• fatty components suitable for use in the formulation of the present invention include polar oils such as lecithins and fatty acid triglycerides, namely triglycerol esters of saturated and/or unsaturated, straight or branched carboxylic acid with 8 to 24 carbon atoms, preferably of 12 to 18 carbon-atoms whereas the fatty acid triglycerides are preferably chosen from synthetic, half synthetic or natural oils (e.g.
• cocoglyceride olive oil, sun flower oil, soybean oil, peanut oil, rape seed oil, sweet almond oil, palm oil, coconut oil, castor oil, hydrogenated castor oil, wheat oil, grape seed oil, macadamia nut oil and others); apolar oils such as linear and/ or branched hydrocarbons and waxes e.g.
• mineral oils vaseline (petrolatum); paraffins, squalane and squalene, polyolefins, hydrogenated polyisobutenes and isohexadecanes, favored polyolefins are polydecenes; dialkyl ethers such as dicaprylylether; linear or cyclic silicone oils such as preferably cyclomethicone (octamethylcyclotetrasiloxane; cetyldimethicone, hexamethylcyclotrisiloxane, polydimethylsiloxane, poly(methylphenylsiloxane) and mixtures thereof.
• cyclomethicone octamethylcyclotetrasiloxane
• cetyldimethicone cetyldimethicone, hexamethylcyclotrisiloxane, polydimethylsiloxane, poly(methylphenylsiloxane) and mixtures thereof.
• fatty components which can advantageously be incorporated in formulations of the present invention are isoeikosane; neopentylglycoldiheptanoate; propyleneglycoldicaprylate/dicaprate; caprylic/capric/diglycerylsuccinate; butylenglycol caprylat/caprat; C 12-13 -alkyllactate; di-C 12-13 alkyltartrate; trisostearin; dipentaerythrityl hexacaprylat/hexacaprate; propylenglycolmonoisostearate; tricaprylin; dimethylisosorbid.
• mixtures C 12-15 -alkylbenzoate and 2-ethylhexylisostearate mixtures C 12-15 -alkylbenzoate and isotridecylisononanoate as well as mixtures of C 12-15 -alkylbenzoate, 2-ethylhexylisostearate and isotridecylisononanoate.
• the oily phase of the formulation of the present invention can also contain natural vegetable or animal waxes such as bee wax, china wax, bumblebee wax and other waxes of insects as well as shea butter and cocoa butter.
• natural vegetable or animal waxes such as bee wax, china wax, bumblebee wax and other waxes of insects as well as shea butter and cocoa butter.
• a moisturizing agent may be incorporated into a composition of the present invention to maintain hydration or rehydrate the skin.
• Moisturizers that prevent water from evaporating from the skin by providing a protective coating are called emollients. Additionally an emollient provides a softening or soothing effect on the skin surface and is generally considered safe for topical use.
• Preferred emollients include mineral oils, lanolin, petrolatum, capric/caprylic triglyceraldehydes, cholesterol, silicones such as dimeticone, cyclometicone, almond oil, jojoba oil, avocado oil, castor oil, sesame oil, sunflower oil, coconut oil and grape seed oil, cocoa butter, olive oil aloe extracts, fatty acids such as oleic and stearic, fatty alcohols such as cetyl and hexadecyl (ENJAY), diisopropyl adipate, hydroxybenzoate esters, benzoic acid esters of C 9-15 -alcohols, isononyl iso-nonanoate, ethers such as polyoxypropylene butyl ethers and polyoxypropylene cetyl ethers, and C 12-15 -alkyl benzoates, and mixtures thereof.
• silicones such as dimeticone, cyclometicone, almond oil, jojoba
• the most preferred emollients are hydroxybenzoate esters, aloe vera, C 12-15 -alkyl benzoates, and mixtures thereof.
• An emollient is present in an amount of about 1 wt. % to about 20 wt. % of the total weight of the composition.
• the preferred amount of emollient is about 2 wt. % to about 15 wt. %, and most preferably about 4 wt. % to about 10 wt. %.
• humectants Moisturizers that bind water, thereby retaining it on the skin surface are called humectants.
• Suitable humectants can be incorporated into a composition of the present invention such as glycerin, polypropylene glycol, polyethylene glycol, lactic acid, pyrrolidone carboxylic acid, urea, phospholipids, collagen, elastin, ceramides, lecithin sorbitol, PEG-4, and mixtures thereof.
• moisturizers are polymeric moisturizers of the family of water soluble and/or swellable/ and/or with water gelating polysaccharides such as hyaluronic acid, chitosan and/or a fucose rich polysaccharide which is e.g. available as Fucogel®1000 (CAS-Nr. 178463-23-5) by SOLABIA S.
• One or more humectants are optionally present at about 0.5 wt. % to about 8 wt. % in a composition of the present invention, preferably about 1 wt. % to about 5 wt. %.
• the aqueous phase of the compositions of the present invention can contain the usual cosmetic additives such as alcohols, especially lower alcohols, preferably ethanol and/or isopropanol, low diols or polyols and their ethers, preferably propyleneglycol, glycerine, ethyleneglycol, ethyleneglycol monoethyl- or monobutylether, propyleneglycol monomethyl- or -monoethyl- or-monobutylether, diethyleneglycol monomethyl-or monoethylether and analogue products, polymers, foam stabilizers; electrolytes and especially one or more thickeners.
• alcohols especially lower alcohols, preferably ethanol and/or isopropanol, low diols or polyols and their ethers
• ethers preferably propyleneglycol, glycerine, ethyleneglycol, ethyleneglycol monoethyl- or monobutylether, propylene
• Thickeners that may be used in formulations of the present invention to assist in making the consistency of a product suitable include carbomer, siliciumdioxide, magnesium and/or aluminum silicates, beeswax, stearic acid, stearyl alcohol polysaccharides and their derivatives such as xanthan gum, hydroxypropyl cellulose, polyacrylamides, acrylate crosspolymers preferably a carbomer, such as carbopole® of type 980, 981, 1382, 2984, 5984 alone or mixtures thereof.
• Suitable neutralizing agents which may be included in the composition of the present invention to neutralize components such as e.g.
• an emulsifier or a foam builder/stabilizer include but are not limited to alkali hydroxides such as a sodium and potassium hydroxide; organic bases such as diethanolamine (DEA), triethanolamine (TEA), aminomethyl propanol, and mixtures thereof; amino acids such as arginine and lysine and any combination of any foregoing.
• the neutralizing agent can be present in an amount of about 0.01 wt. % to about 8 wt. % in the composition of the present invention, preferably, 1 wt. % to about 5 wt. %.
• the emulsions/microemulsions of this invention may contain preferably electrolytes of one or several salts including anions such as chloride, sulfates, carbonate, borate and aluminate, without being limited thereto.
• suitable electrolytes can be on the basis of organic anions such as, but not limited to, lactate, acetate, benzoate, propionate, tartrate and citrate.
• cations preferably ammonium, alkylammonium, alkali- or alkaline earth metals, magnesium-, iron- or zinc-ions are selected.
• Electrolytes can be present in an amount of about 0.01 wt. % to about 8 wt. % in the composition of the present invention.
• compositions of the invention are useful as compositions for photoprotecting the human epidermis or hair against the damaging effect of ultraviolet irradiation, as sunscreen compositions.
• Such compositions can, in particular, be provided in the form of a lotion, a thickened lotion, a gel, a cream, a milk, an ointment, a powder or a solid tube stick and can be optionally be packaged as an aerosol and can be provided in the form of a mousse, foam or a spray.
• the cosmetic composition according to the invention when they are provided for protecting the human epidermis against UV radiation or as sunscreen composition, they can be in the form of a suspension or dispersion in solvents or fatty substances, or alternatively in the form of an emulsion or microemulsion (in particular of O/W or W/O type, O/W/O or W/O/W-type), such as a cream or a milk, a vesicular dispersion, in the form of an ointment, a gel, a solid tube stick or an aerosol mousse.
• the emulsions can also contain anionic, nonionic, cationic or amphoteric surfactants.
• reaction mixture was diluted with ethylacetate and washed with 1n NaOH, water and NaCl solution, dried with Na 2 SO 4 , concentrated and recrystallised from hexene to yield 14.3 g (86%) of 2-(4-prop-2-enyloxy-phenyl)-benzoxazole. M.p. 95-96° C., UV (ethanol) 308 nm (26′184).
• a 250 ml round bottom flask, equipped with a reflux condenser and an oil bath with a magnetic stirrer was charged with 4.0 g (22 mmol) triethoxysilane and 5.0 g (20 mmol) of the above 2-(4-allyloxyphenyl)-benzoxazole in 100 ml of toluene under nitrogen atmosphere.
• the reaction mixture was heated to 70° C. and a catalytic amount of divinyl-tetramethyl disiloxane platinum complex was added. After the reaction mixture was heated for 2 hours, another 1.8 g (11 mmol) triethoxysilane were added and the reaction mixture was stirred over night.
• a 250 ml round bottom flask, equipped with a reflux condenser and an oil bath with a magnetic stirrer was charged with 10.0 g (82 mmol) trimethoxysilane and 5.0 g (16.4 mmol) of 2-[[4-(prop-2-enyloxy)benzylidene]-malonic acid diethyl ester in 100 ml of toluene under nitrogen atmosphere.
• the reaction mixture was heated to 70° C. and a catalytic amount of divinyl-tetramethyl disiloxane platinum complex was added.
• a 250 ml round bottom flask, equipped with a reflux condenser and an oil bath with a magnetic stirrer was charged with 2.2 g (18 mmol) trimethoxysilane and 5.0 g (16.5 mmol) of propanedioic acid, [[4-(2-propynyloxy)phenyl]methylene]diethyl ester in 100 ml of toluene under nitrogen atmosphere.
• the reaction mixture was heated to 70° C. and a catalytic amount of divinyl-tetramethyl disiloxane platinum complex was added.
• a 1000 ml round bottom flask, equipped with a reflux condenser and an oil bath with a magnetic stirrer was charged with 72 g (0.44 mol) triethoxysilane and 120 g (0.4 mol) of propanedioic acid [[4-(2-propynyloxy)phenyl]methylene]diethyl ester in 500 ml of toluene under nitrogen atmosphere.
• the reaction mixture was heated to 70° C. and a catalytic amount of divinyl-tetramethyl disiloxane platinum complex was added. After the reaction mixture was heated for 20 hours, another 6.6 g (0.04 mol) triethoxysilane are added and the mixture was stirred for an additional 4 h.
• the obtained powder was incorporated into an emulsion as described in Example 7 yielding an in vitro SPF value of 5.
• W/O sunscreen emulsion % A) Brij 721 2.00 Brij 72 2.00 Cetyl Gaming 2.00 Stearyl Middle (Lanette 18) 1.00 Lanette 22 1.00 Myritol 318 11.20 Tegosoft TN 2.00 Arlamol HD (Isohexadecane) 3.00 BHT 0.05 Phenonip 1.00 B) Aqua 58.50 Glycerin 5.00 Edeta BD 0.10 C) KOH 10% 0.15 D) Sepigel 305 1.00 E) Microcapsules of example 6 10.00 100.00 Heat part A) and B) to 85° C. while stirring. Add part B) to A) under agitation. Cool to about 45° C. while stirring Then add part C). Add part D) at 40° C. Cool to ambient temperature while stirring. Add part E). Homogenize again to achieve a small particle size.

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