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
  • A61K8/34—Alcohols
  • A61K8/345—Alcohols 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
  • A61K8/45—Derivatives containing from 2 to 10 oxyalkylene groups
• • 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
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L101/00—Compositions of unspecified macromolecular compounds
  • C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
  • C08L101/025—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing nitrogen atoms

Definitions

• the invention relates to novel polyglycerol based UV-filters as well as to topical compositions comprising such novel polyglycerol based UV-filters. Furthermore, the invention relates to the use of such novel polyglycerol based UV-filters to enhance the solubility of butyl methoxydibenzoylmethane and/ or bis-ethylhexyloxyphenol methoxyphenyl triazine in cosmetic oils.
• UV-B radiation UV-A radiation
• UVA UV-A radiation
• BMDBM butyl methoxydibenzoylmethane
• BMDBM exhibits only a limited solubility in the conventional cosmetic oils used for the solubilisation of solid UV-filter substances in order to enable their incorporation into cosmetic preparations (such as e.g. the cosmetic oils C12-15 alkyl benzoate, diisopropyl sebacate or dibutyl adipate), which is typically less than 20%.
• cosmetic preparations such as e.g. the cosmetic oils C12-15 alkyl benzoate, diisopropyl sebacate or dibutyl adipate
• sun-care products containing high amounts BMDBM require high amounts of such cosmetic oils in order to solubilize BMDBM and avoid a re-crystallization in the product, which in turn, however, often results in an unpleasant oily gritty and/ or tacky skin feel of the final products and a reduction in UV protection performance.
• the invention relates to novel polyglycerol based UV filters obtainable by a process comprising the steps of
• x is an integer selected in the range from 3-16
• y is an integer selected in the range from 1 -6
• z is an integer selected in the range from 0-10.
• 15 to 100%, more preferably, 30 to 80%, most preferably about 60-75% of the hydroxyl groups of the hyperbranched polyether-polyol backbone are esterified with p-dimethylamino benzoic acid and 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid.
• 7.5 to 40% of hydroxyl groups of the hyperbranched polyether- polyol backbone are esterified with p-dimethylamino benzoic acid and 7.5 to 50% with 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid.
• p-dimethylamino benzoic acid and 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid are used in such an amount that the molar ratio between p-dimethylamino benzoic acid and 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid is in the range of 1 :2 to 2:1 , more in particular in the range of 0.7 to 1 .7, even more in particular in the range of 0.9 to 1 .6 such as in the range of 1 .0 to 1 .5 (i.e. p-dimethylamino benzoic acid:2-(4-diethylamino-2- hydroxybenzoyl)benzoic acid is 1 :1 to 1 .5:1 ).
• the amount of glycidol units x is in particular selected in the range of about 5 to 12, more in particular in the range of about 6 to 9 mol equivalents per mol equivalent of the polyol starter unit.
• x is in particular an integer selected in the range from 5 to 12, more in particular in the range from 6 to 9.
• the amount of propylene oxide is preferably selected in the range from about 1 to 8, in particular in the range from about 1 to 2 X (x+y).
• z is in particular an integer selected in the range from 1 to 8, more in particular in the range from 1 to 2.
• Suitable capping agents include anhydrides or acid chlorides or acid esters of C-i to C 20 linear or branched alkanoic acids such as e.g. acetanhydride, acetylchloride, 2-ethyl hexanoic acid (m)ethyl ester or 2-ethyl hexanoic acid chloride, 3,5,5-trimethylhexanoyl chloride or 3,5,5-trimethylhexanoyl (m)ethylester.
• acetanhydride acetylchloride
• 2-ethyl hexanoic acid (m)ethyl ester or 2-ethyl hexanoic acid chloride
• 3,5,5-trimethylhexanoyl chloride or 3,5,5-trimethylhexanoyl (m)ethylester 3,5,5-trimethylhexanoyl chloride or 3,5,5-trimethylhexanoyl (m)ethy
• the residual hydroxyl groups of the hyperbranched polyether-polyol backbone are capped with acetanhydride, acetyl chloride, 2-ethyl hexanoic acid chloride, 2-ethyl hexanoic acid (m)ethyl ester, 3,5,5-trimethylhexanoyl chloride or 3,5,5-trimethylhexanoyl (m)ethylester as well as mixtures thereof.
• the capping group is a 2-ethyl hexanoyl-, acetyl- and/or a 3,5,5-trimethylhexanoyl- group.
• hydroxyl groups of the hyperbranched polyether-polyol backbone are linked to a p-dimethylamino benzoyl and 2-(4-diethylamino-2-hydroxybenzoyl)benzoyl moiety and the residual hydroxyl groups are linked to a capping group, in particular to an 2-ethylhexanoyl-, an acetyl- and/ or a 3,5,5-trimethylhexanoyl group, in particular to a 2-ethylhexanoyl- or a 3,5,5-trimethylhexanoyl group.
• polyol starter units include C 1-12 -alkohols such as methanol or ethanol, glycidol, glycol, 1 ,4-cyclohexanedimethanol, hydroquinone bis(2-hydroxyethyl) ether, 2,2'- thiodiethanol, N-methyldiethanolamine, N-ethyldiethanolamine, 1 ,4-butanediol, 1 ,5- pentanediol, 1 ,6-hexanediol, 1 ,7-heptanediol, 1 ,8-octanediol, 1 ,9-nonanediol, 2-butene-1 ,4- diol, diethylene glycol, triethylene glycol, hexaethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, tripentaerythritol, 1 ,2,6-hexanetriol,
• the polyol starter unit is preferably selected from pentaerythritol, dipentaerythritol and/ or trimethylolpropane, most preferably the polyol starter unit is trimethylolpropane.
• the hyperbranched polyether-polyol backbone is obtainable by a one pot ring-opening polymerization reaction initiated by a polyol starter unit using glycidol as AB 2 -type monomer i.e. building block followed by chain extension with propylene oxide to form the hyperbranched polyether-polyol backbone carrying free hydroxyl groups.
• the theoretical amount of the free hydroxyl groups ((x+y) mol equivalents) in the hyperbranched polyether-polyol backbone can be calculated on the basis of the molar equivalents of hydroxyl groups per polyol starter unit (y) to the molar equivalents of glycidol building blocks used (x) as every glycidol unit adds one additional free hydroxyl group to the hyperbranched polyether-polyol backbone.
• ring-opening polymerization refers to a form of addition polymerization, in which an initiator (i.e. a polyol starter unit) and/or the terminal end of a polymer acts as a reactive center where further cyclic monomeric building blocks, i.e. the glycidol join to form a larger polymer chain through ionic propagation.
• an initiator i.e. a polyol starter unit
• the terminal end of a polymer acts as a reactive center where further cyclic monomeric building blocks, i.e. the glycidol join to form a larger polymer chain through ionic propagation.
• the reactive center propagating chain is a cation the polymerization is called cationic ring-opening polymerization and when the active center is an anion the reaction is an anionic ring-opening polymerization.
• the ring-opening polymerization is performed using an effective amount of at least one catalyst, such as e.g. a base or an
• Suitable catalysts are e.g. Lewis acids such as AICI 3 , FeCI 3 , SnCI 4 , and BF 3 and/ or Bronsted acids such as naphthalene sulphonic acid, para-toluene sulphonic acid, methane sulphonic acid, trifluoromethane sulphonic acid, trifluoroacetic acid, sulphuric acid and/or phosphoric acid, and/or onium salts, alcoholates such as e.g. potassium tert.- butylate or potassium methylate without being limited thereto.
• Further catalysts are alkali metals such as potassium or sodium, and alkali metal hydrides such as potassium hydride and sodium hydride.
• an anionic ring-opening polymerization using potassium hydride and/or potassium methylate as catalyst is used.
• the esterification of the hydroxyl groups of the hyperbranched polyether-polyol backbone with p-dimethylamino benzoic acid and 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid can be performed by known method to a person skilled in the art, e.g. by transforming the acid into an acid chloride and subsequent reaction of the acid chloride with the hydroxyl groups of the hyperbranched polyether-polyol backbone in the presence of a base.
• An alternative method includes the transesterification of an ester of p-dimethylamino benzoic acid and an ester of 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid with the terminal hydroxyl groups of the hyperbranched polyether-polyol backbone in the presence of a base.
• the p-dimethylamino benzoic acid and the 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid can be coupled directly as mixture in one step or as separate compounds in two consecutive steps as outlined in the examples.
• Suitable esters are for example the methyl or the ethyl esters, in particular the methyl esters.
• Suitable bases according to the invention encompass alcoholates such as e.g.
• potassium tert.-butylate or potassium methylate alkali metals such as potassium or sodium as well as alkali metal hydrides such as potassium hydride and sodium hydride as well as amines such as 1 ,8-diazabicyclol[5.4.0]undec-7-ene or pyridine.
• alkali metals such as potassium or sodium as well as alkali metal hydrides such as potassium hydride and sodium hydride as well as amines
• 1 ,8-diazabicyclol[5.4.0]undec-7-ene or potassium tert.-butylate is used.
• esterification is performed by transesterification of an ester of p-dimethylamino benzoic acid and an ester of 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid such as in particular dimethylamino benzoic acid (m)ethyl ester and 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid (m)ethyl ester.
• the polyglycerol based UV filters according to the invention have a number average molecular weight M n in the range of about 500 to 50,000 g mol "1 , more preferably of about 750 to 25,000 g mol "1 , most preferably of about 1 ,000 to 10,000 g mol "1 .
• the number average molecular weight Mn can be determined by Gel Permeation Chromatography (GPC) as described in the DIN 55672-1 using e.g. polystyrene standards.
• the photostability of the polymer according to the present invention may be measured according to G. Berset et al. International Journal of Cosmetic Science 1996, 18(3), 167- 177.
• the polyglycerol based UV filters according to the present invention are useful to enhance the solubility of solid, oil soluble UV-filter substances such as BMDBM, bis- ethylhexyloxyphenol methoxyphenyl triazine, benzophenone-3, drometrizole trisiloxane, ethylhexyl triazone, diethylhexyl butamido triazone, 4-methyl benzylidene camphor or 2-(4- Diethylamino-2-hydroxy-benzoyl)-benzoic acid hexylester in cosmetic oils suitable as solvents for such solid, oil soluble UV-filter substances and suitable for the preparation of topical compositions such as in particular in C 2- 15 alkyl benzoate or diisopropyl sebacate.
• BMDBM bis- ethylhexyloxyphenol methoxyphenyl triazine
• benzophenone-3 drometrizole trisiloxane
• polyglycerol based UV filters according to the present invention are useful to enhance the solubility of BMDBM or bis-ethylhexyloxyphenol methoxyphenyl triazine as well as mixtures thereof in cosmetic oils suitable as solvents for BMDBM or bis- ethylhexyloxyphenol methoxyphenyl triazine such as in particular in C12-15 alkyl benzoate or diisopropyl sebacate.
• the polyglycerol based UV filters according to the invention are useful as UV filter substances, i.e. for protecting ultraviolet-sensitive organic materials, in particular the skin and hair of humans and animals from the harmful effects of UV radiation.
• the polyglycerol based UV filters according to the present invention are not only suitable for "immediate protection from acute sun damage” such as sun burn (sun erythema), but also protect against damages through sunlight-induced oxidative stress and/or immune suppression and/or their consequences, i.e. photo aging.
• the polyglycerol based UV filters according to the present invention are also suitable to protect natural or artificial hair color.
• the polyglycerol based UV filters according to the present invention also lead to a synergistic UV-light absorption if used in combination with at least one further UV- filter substance. Furthermore, the polyglycerol based UV filters according to the present invention are suitable to reduce the stickiness e.g. of sand on the skin as well as to enhance the water resistance.
• the polyglycerol based UV filters according to the present invention are colorless or yellowish, liquid, crystalline or semi-liquid substances. They are distinguished by high photostability, good solubility in organic solvents, especially cosmetic solvents such as in particular in C12-15 alkyl benzoate (e.g., FINSOLV TN [Finetex Inc.]) or diisopropyl sebacate, and a short and economical synthetic route.
• C12-15 alkyl benzoate e.g., FINSOLV TN [Finetex Inc.]
• diisopropyl sebacate e.g., FINSOLV TN [Finetex Inc.]
• the present invention also relates to compositions, preferably to topical compositions comprising a polyglycerol based UV filter according to the present invention and a cosmetically or pharmaceutically acceptable carrier.
• the amount of the polyglycerol based UV filter in the compositions according to the invention is not critical. Preferably an amount of at least 0.01 wt.-% is used. More preferably an amount of 0.5 to 20 wt.-%, in particular 1 to 10 wt.-% such as e.g. from about 2 to 5 wt.- % based on the total weight of the composition is incorporated into the compositions.
• compositions according to the invention further comprise an additional amount of an oil soluble, solid UV-filter substance.
• oil soluble, solid UV-filter substances are in particular butyl methoxydibenzoylmethane (BMDBM), bis- ethylhexyloxyphenol methoxyphenyl triazine (BEMT, Tinosorb ® S), benzophenone-3, drometrizole trisiloxane, ethylhexyl triazone, diethylhexyl butamido triazone, 4-methyl benzylidene camphor or 2-(4-Diethylamino-2-hydroxy-benzoyl)-benzoic acid hexylester as well as mixtures thereof.
• BDBM butyl methoxydibenzoylmethane
• BEMT bis- ethylhexyloxyphenol methoxyphenyl triazine
• benzophenone-3 drometrizole trisiloxane
• the topical composition according to the invention comprises BMDBM as oil soluble, solid UV-filter substance in an amount of at least 0.01 wt.-%.
• the topical composition comprises BMDBM in an amount of 0.5 to 5 wt.-%, most in particular in an amount of 2 to 5 wt.-% based on the total weight of the composition.
• the topical composition according to the invention further comprises bis-ethylhexyloxyphenol methoxyphenyl triazine in an amount of at least 0.01 wt.-%.
• the topical composition comprises bis-ethylhexyloxyphenol methoxyphenyl triazine in an amount of 0.5 to 5 wt.-%, most in particular in an amount of 1 to 3 wt.-% based on the total weight of the composition.
• the topical composition according to the present invention comprises as solid UV absorbers BMDBM and bis-ethylhexyloxyphenol methoxyphenyl triazine in the amounts given above.
• BMDBM is incorporated in an amount of 2 to 5 wt.-% and bis-ethylhexyloxyphenol methoxyphenyl triazine in an amount of 1 to 3 wt.-% based on the total weight of the composition.
• UV-filter substances may show a synergistic effect.
• additional UV-filter substances are advantageously selected from among acrylates such as 2-ethylhexyl 2-cyano-3,3-diphenylacrylate (octocrylene, PARSOL ® 340), ethyl 2-cyano-3,3-diphenylacrylate and the like; camphor derivatives such as 4-methyl benzylidene camphor (PARSOL ® 5000), 3-benzylidene camphor, camphor benzalkonium methosulfate, polyacrylamidomethyl benzylidene camphor, sulfo benzylidene camphor, sulphomethyl benzylidene camphor, therephthalidene dicamphor sulfonic acid and the like; cinnamate derivatives such as ethylhexyl methoxycinnamate (PARSOL ® 5000), 3-benzylidene camphor, camphor benzalkonium m
• 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.
• salicylate derivatives such as isopropylbenzyl salicylate, benzyl salicylate, butyl salicylate, ethylhexyl salicylate (PARSOL ® EHS, Neo Heliopan ® OS), isooctyl salicylate or homomenthyl salicylate (homosalate, PARSOL ® HMS, Neo Heliopan ® HMS) and the like; triazine derivatives such as ethylhexyl triazone (Uvinul ® T-150), diethylhexyl butamido triazone ethylhexyl triazone (Uvinul ® T-150), diethylhexyl butamido triazone (Uvasorb ® HEB), 2,4,6-Tris-(biphenyl)1 ,3,5- triazine and the like, merocyanines as
• encapsulated UV-filters such as encapsulated ethylhexyl methoxycinnamate (Eusolex ® UV-pearls) or microcapsules loaded with UV-filters as e.g.
• dibenzoylmethane derivatives such as 4-tert.-butyl-4'-methoxydibenzoyl-methane (PARSOL ® 1789), dimethoxydibenzoylmethane, isopropyldibenzoylmethane and the like
• benzotriazole derivatives such as 2,2'-methylene-bis-(6-(2H-benzotriazole-2-yl)-4-(1 , 1 ,3,3,- tetramethylbutyl)-phenol (Tinosorb ® M) and the like
• phenylene-1 ,4-bis-benzimidazolsulfonic acids or salts such as 2,2-(1 ,4-phenylene)bis-(1 H-benzimidazol-4,6-disulfonic acid)
• microparticulated refers to a particle size from about 5 nm to about 200 nm, particularly from about 15 nm to about 100 nm.
• the pigments may also be coated by other metal oxides such as e.g. aluminum or zirconium oxides or by organic coatings such as e.g. polyols, methicone, aluminum stearate, alkyl silane. Such coatings are well known in the art.
• the pigments (ZnO, Ti0 2 ) can be used in the form of commercially available oily or aqueous pre- dispersions. These pre-dispersions may further contain a dispersing aid and/ or solubilisator.
• UV-filter substances to be used in combination with a polyglycerol based UV filter according to the present invention are the commercially available and widely used UV-filter substances octocrylene (PARSOL ® 340), 4-methyl benzylidene camphor (PARSOL ® 5000), ethylhexyl methoxycinnamate (PARSOL ® MCX), ethylhexyl triazone (Uvinul ® T-150), diethylhexyl butamido triazone (Uvasorb ® HEB), 2,2'- methylene-bis-(6-(2H-benzotriazole-2-yl)-4-(1 , 1 ,3,3,-tetramethylbutyl)-phenol (Tinosorb ® M), bis-ethylhexyloxyphenol methoxyphenyl triazine (Tinosorb ® S), 2,2-(1 ,4-phenylene)bis-(1 H
• the additional UV-filter substances are generally present in the compositions according to the invention in proportions ranging from 0.1 to 30 wt.-%, preferably ranging from 0.2 to 15 wt.-%, most preferably ranging from 0.5 to 10 wt.-% with respect to the total weight of the composition.
• the invention also relates to topical compositions according to the invention which next to a dibenzoylmethane derivative such as in particular BMDBM also contain an effective amount of a stabilizer.
• effective amount of a stabilizer refers to an amount suitable for the photostabilization of a dibenzoylmethane derivative. The amount may vary from stabilizer to stabilizer (e.g. based on the mode of action) and can easily been determined by a person skilled in the art with normal trials, or with the usual considerations regarding the formulation of cosmetic composition.
• Suitable amounts may range from 0.01 to 1 wt.-% as well as from 0.5 to 20 wt.-%, such as 1 to 10 wt.-% with respect to the total weight of the composition.
• Suitable stabilizers include octocrylene, diethylhexyl-2,6-naphthalate, polyester-8, diethylhexyl syringylidenemalonat, butyloctyl salicylate, polysilicone-15, tris(tetramethylhydroxypiperidinol)citrate, benzotriazolyl dodecyl p-cresol, benzophenone-3, 4-methylbenzylidene camphor, Methoxycrylene (Solastay S1 ) and/ or bis ethylhexyloxyphenol methoxyphenyl triazine. Particularly suitable as stabilizer is octocrylene.
• the invention also relates to a topical composition
• a topical composition comprising a polyglycerol based UV filter according to the invention, BMDBM and octocrylene or methoxycrylene, in particular octocrylene, preferably the polyglycerol based UV filter is used in an amount of 0.5 to 20 wt.-%, BMDBM in an amount of 2 to 5 wt.-% and octocrylene in an amount of 2 to 10 wt.-%.
• topical compositions according to the present invention are free of p-methylbenzylidene camphor.
• the topical compositions according to the present invention furthermore contain one or more preservatives such as e.g. Methylparabene, Ethylparabene, Propylparabene or Butylparabene, Isobutylparabene, Benzoic Acid and its salts (e.g. Sodium Benzoate), Sorbic Acid and its salts (e.g.
• preservatives such as e.g. Methylparabene, Ethylparabene, Propylparabene or Butylparabene, Isobutylparabene, Benzoic Acid and its salts (e.g. Sodium Benzoate), Sorbic Acid and its salts (e.g.
• Potassium Sorbate Dehydracetic Acid and its salts, Bronopol, Triclosan, Imidazolidinyl Urea, Phenoxyethanol, Benzyl Alcohol, Methylchloroisothiazolinone, Methylisothiazolinone, Chlorphenesin, Ethylhexylglycerin, lodopropinylbutylcarbamate or Pentylene Glycol as well as mixtures thereof and without being limited thereto.
• a total content of about 0.01 to 2 wt.-%, such as in particular 0.05 to 1 wt.-% of preservatives with respect to the total weight of the composition is preferred.
• the topical compositions according to the present invention may in particular contain further ingredients such as moisturizers; anti-oxidants; insect repellents; ingredients for skin lightening, tanning prevention and/ or treatment of hyperpigmentation; tanning agents, ingredients for preventing or reducing wrinkles, lines, atrophy and/or inflammation; as well as topical anesthetics.
• further ingredients such as moisturizers; anti-oxidants; insect repellents; ingredients for skin lightening, tanning prevention and/ or treatment of hyperpigmentation; tanning agents, ingredients for preventing or reducing wrinkles, lines, atrophy and/or inflammation; as well as topical anesthetics.
• moisturizers for the incorporation into the topical compositions according to the invention are glycerin, lactic acid and/ or lactates, in particular sodium lactate, butylene glycol, propylene glycol, biosaccaride gum-1 , glycine soja, ethylhexyloxyglycerin, pyrrolidoncarboxy acid, hydroxyethylurea and urea.
• polymeric moisturizer such as water soluble or water gelifiable polysaccharides.
• advantageous are e.g.
• the moisturizers can also be used as anti-ageing ingredients such as e.g. for the treatment of photo-aged skin.
• the topical compositions according to the invention preferably contain at least one moisturizer in an amount (in total) of 0.1 to 20 wt.-%, preferably 0.5 to 10 wt.-% based on the total weight of the composition.
• Particularly suited antioxidants for the topical compositions according to the invention encompass vitamin E and its derivatives such as particularly tocopheryl acetate.
• Tocopheryl acetate may be present in the topical compositions in an amount from about 0.05 wt.-% to about 25 wt.-%, in particular 0.05 wt.-% to 5 wt.-%.
• Another vitamin E derivative of interest is tocopheryl linoleate.
• Tocopheryl linoleate may be present in the topical composition in an amount from about 0.05 wt.-% to about 25 wt.-% in particular 0.05 wt.-% to 5 wt.-%.
• Another suitable antioxidant is vitamin A and/or its derivatives.
• retinoid derivatives such as retinyl palmitate or retinyl propionate is used in the topical compositions according to the invention in an amount of 0.01 - 5 wt.-%, in particular 0.01 - 0.3 wt.-%.
• the vitamin A and/ or its derivatives can also be used in an encapsulated form.
• Another suitable antioxidant is Vitamin C (ascorbic acid) and/or its derivatives.
• ascorbyl phosphate such as Stay C (sodium ascorbyl monophosphate) is used in the topical compositions according to the invention in an amount of 0.1 - 5 wt.-% in particular 0.1 - 2 wt.-%.
• Suitable insect repellents include N,N-Diethyl-3-methylbenzamid (Meta-delphene, "DEET”), Dimethylphtalat (Palatinol M, DMP), 1-Piperidincarbonsaure-2-(2-hydroxyethyl)-1- methylpropylester as well as particularly 3-(N-n-Butyl-N-acetyl-amino)-propionic acid (available as Insect Repellent ® 3535 at Merck) as well as mixtures thereof.
• DEET N,N-Diethyl-3-methylbenzamid
• DMP Dimethylphtalat
• 1-Piperidincarbonsaure-2-(2-hydroxyethyl)-1- methylpropylester as well as particularly 3-(N-n-Butyl-N-acetyl-amino)-propionic acid (available as Insect Repellent ® 3535 at Merck) as well as mixtures thereof.
• Suitable skin lightening (depigmentation) agents to be used in the topical compositions according to the invention encompass alpha-arbutin, resveratrol, hydroquinone, azelaic acid, kojic acid as well as ascorbyl phosphates such as Magnesium-/, -ascorbyl-2- phosphate (MAP) or sodium ascorbyl monophosphate.
• ascorbyl phosphates such as Magnesium-/, -ascorbyl-2- phosphate (MAP) or sodium ascorbyl monophosphate.
• Suitable tanning agents are dihydroxyacetone, erythrulose and/ or melanine derivates in an amount of 1 to 10 wt.-% based on the total weight of the composition according to the invention.
• cosmetically active ingredients suitable to be used in the topical composition according to the invention comprise peptides (e.g., MatrixylTM [pentapeptide derivative]), oligopeptides, wax-based synthetic peptides (e.g., octyl palmitate and tribehenin and sorbitan isostearate and palmitoyl-oligopeptide), glycerol, alpha-glycosylrutin, natural or synthetic flavanoids or isoflavanoids, creatine, creatinine, guanidine (e.g.
• vitamin C ascorbic acid
• vitamin A e.g., retinoid derivatives such as retinyl palmitate or retinyl propionate
• vitamin E e.g., tocopherol acetate
• vitamin B 3 e.g. niacinamide
• vitamin B 5 e.g. panthenol
• vitamin B 6 and vitamin B 12 biotin, folic acid
• anti-acne actives or medicaments e.g. resorcinol, salicylic acid, and the like
• antioxidants e.g. phytosterols, lipoic acid
• flavonoids e.g.
• isoflavones, phytoestrogens skin soothing and healing agents such as aloe vera extract, allantoin and the like; agents suitable for aesthetic purposes such as essential oils, fragrances, skin sensates, opacifiers, aromatic compounds (e.g., clove oil, menthol, camphor, eucalyptus oil, and eugenol), desquamatory actives, hydroxy acids such as AHA acids, poly unsaturated fatty acids, radical scavengers, farnesol, antifungal actives in particular bisabolol, alkyldiols such as 1 ,2-pentanediol, hexanediol or 1 ,2-octanediol, phytol, polyols such as phytanetriol, ceramides and pseudoceramides, amino acids, protein hydrolysates, polyunsaturated fatty acids, plant extracts like kinetin, DNA or RNA and their fragmentation products, carbohydrates,
• the additional cosmetically active ingredient is typically included in an amount of at least 0.001 wt. % based on the total weight of the topical composition. Generally, an amount of about 0.001 wt. % to about 30 wt. %, preferably from about 0.001 wt. % to about 10 wt. % of an additional cosmetically active agent is used.
• Particularly preferred examples of ingredients to be used in the compositions according to the invention are vitamin C (ascorbic acid) and/or its derivatives (e.g.
• vitamin A and/or its derivatives e.g., retinoid derivatives such as retinyl palmitate or retinyl propionate
• vitamin E and/or its derivatives e.g., tocopherol acetate
• vitamin B 6 vitamin B 12
• the topical cosmetic compositions of the invention can also contain usual cosmetic or pharmaceutical adjuvants and additives, such as preservatives, film forming agents, antioxidants, fatty substances/ oils and/ or waxes, water, organic solvents, silicones, thickeners, softeners, emulsifiers, antifoaming agents, aesthetic components such as fragrances, surfactants, fillers, sequestering agents, anionic, cationic, nonionic or amphoteric polymers or mixtures thereof, propellants, acidifying or basifying agents, dyes, colorings/colorants, abrasives, absorbents, essential oils, skin sensates, astringents, perfumes or any other ingredients usually formulated into cosmetic compositions such as alcohols, polyols or electrolytes.
• cosmetic adjuvants and additives such as preservatives, film forming agents, antioxidants, fatty substances/ oils and/ or waxes, water, organic solvents, silicones, thickeners, softeners, emulsifiers
• Such cosmetic ingredients commonly used in the skin care industry, which are suitable for use in the compositions of the present invention are e.g. described in the CTFA Cosmetic Ingredient Handbook, Second Edition (1992) without being limited thereto.
• the necessary amounts of the cosmetic and pharmaceutical adjuvants and additives can - based on the desired product form- easily be chosen by a skilled person in this field and will be illustrated in the examples, without being limited hereto.
• the usual cosmetic adjuvants and additives such as e.g. emulsifiers, thickeners, surface active ingredients and film formers can show synergistic effects which can be determined by the expert in the field with normal trials, or with the usual considerations regarding the formulation of cosmetic composition.
• the fatty substances can be an oil or a wax, or mixtures thereof.
• oil is intended a compound which is liquid at ambient temperature.
• wax is intended a compound which is solid or substantially solid at ambient temperature and for which the melting point is generally greater than 35° C.
• oils are mineral oils (liquid paraffin); vegetable oils (sweet almond, macadamia, blackcurrant seed or jojoba oil); synthetic oils, such as perhydrosqualene, fatty alcohols, acids or esters (such as the C 12- 15 alkyl benzoate marketed under the trademark "Finsolv TN" by Finetex, octyl palmitate, isopropyl lanolate or triglycerides, including those of capric/caprylic acids), or oxyethylenated or oxypropylenated fatty esters and ethers; silicone oils (cyclomethicone, polydimethylsiloxanes or PDMS); fluorinated oils; polyalkylenes and their mixtures.
• mineral oils liquid paraffin
• vegetable oils sweet almond, macadamia, blackcurrant seed or jojoba oil
• synthetic oils such as perhydrosqualene, fatty alcohols, acids or esters (such as the C 12- 15 alkyl benzoate marketed under
• the oils used in the compositions according to the invention are selected from the list of polar oils such as the lecitines and fatty acid triglycerides, namely triglycerinester of saturated or unsaturated, branched or linear alkanoic acids with a chain length of 8 to 24, particularly 12 to 18C-atoms.
• the fatty acid triglycerides may preferably be selected from the group of synthetic, semi synthetic and natural oils such as e.g. cocoglyceride, olive oil, sunflower oil, soy bean oil, peanut oil, palm oil, sweet almond oil macadamia oil, coconut oil etc. Further particularly suitable are natural waxes such as bees wax, shea butter, and/ or lanolin.
• suitable polar oils according to the present invention may be selected from the group of esters of saturated or unsaturated, branched or linear alkanoic acids with a chain length of 3 to 30 C-atoms and saturated or unsaturated, branched or linear alcohols with a chain length of 3 to 30C-atoms as well as from the group of esters from aromatic carbonic acids and saturated or unsaturated, branched or linear alcohols with a chain length of 3 to 30C-atoms.
• ester oils are particularly selected from the group of phenylethylbenzoate, octylpalmitate, octylcocoate, octylisostearate, octyldodeceylmyristate, octyldodecanol, cetearylisononanoate, isopropylmyristate, isopropylpalmitate, isopropylstearate, isopropyloleate, n-butylstearate, n-hexyllaurate, n-decyloleate, isooctylstearate, isononylstearate, isononylisononanoate, 2-ethylhexylpalmitate, 2- ethylhexyllaurate, 2-hexyldecylstearate, 2-octyldodecylpalmitate, stearylhept
• suitable oils may be selected from the group of dialkyl ether and dialkylcarbonates such as particularly dicaprylylether (Cetiol OE) and/ or dicaprylylcarbonate, (e.g. available as Cetiol CC at Cognis).
• dialkyl ether and dialkylcarbonates such as particularly dicaprylylether (Cetiol OE) and/ or dicaprylylcarbonate, (e.g. available as Cetiol CC at Cognis).
• oils may be selected from the group of isoeikosan, neopentylglykoldiheptanoate, propylenglykoldicaprylaet caprylate/dicaprate, caprylic/ capric/ diglyceryl succinate, butylene glyckol dicaprylate/dicaprate, Ci 2 -13-Alkyllactate, D1-C12-13- alkyltartrate, triisostearin, dipentaerythrityl hexacaprylate hexacaprate, propylenglykolmonoisostearate, tricaprylin and dimethylisosorbid.
• oil phase of the topical compositions according to the invention contains an amount of Ci 2 -i5-alkylbenzoate or consists essentially thereof.
• oily components are e.g. butyloctylsalicylate (e.g. Hallbrite BHB from CP Hall), hexadecylbenzoate and butyloctylbenzoate as well as mixtures therof (e.g. Hallstar AB).
• butyloctylsalicylate e.g. Hallbrite BHB from CP Hall
• hexadecylbenzoate e.g. Hallbrite BHB from CP Hall
• butyloctylbenzoate e.g. Hallstar BHB from CP Hall
• mixtures therof e.g. Hallstar AB
• the topical compositions according to the present invention may also contain apolar oils such as e.g. branched or linear hydrocarbons and waxes, in particular mineral oil, vaseline (Petrolatum), paraffin oil, squalan and squalen, polyolefins, hydrogenated polyisobutenes, C 13-16 isoparaffin and isohexadecan. Within the group of polyolefins polydecenes are preferred.
• apolar oils such as e.g. branched or linear hydrocarbons and waxes, in particular mineral oil, vaseline (Petrolatum), paraffin oil, squalan and squalen, polyolefins, hydrogenated polyisobutenes, C 13-16 isoparaffin and isohexadecan.
• apolar oils such as e.g. branched or linear hydrocarbons and waxes, in particular mineral oil, vaseline (Petrolatum), paraffin oil, squalan and squal
• Exemplary waxy compounds in particular suitable for the use in the compositions according to the invention are paraffin wax, carnauba wax, beeswax or hydrogenated castor oil.
• Exemplary organic solvents in particular suitable for the use in the compositions according to the invention include the lower alcohols and polyols having at most 8 carbon atoms.
• the compositions according to the invention comprise ethanol in an amount of 5 to 40 wt.-% based on the total weight of the composition.
• the thickeners are advantageously selected, in particular, from among the cross linked polyacrylic acids or modified or unmodified guar gums and celluloses, such as hydroxypropylated guar gum, methylhydroxyethylcellulose and hydroxypropylmethylcellulose.
• Suitable film forming agents include polymers in the basis of PVP such as in particular copolymers of polyvinylpyrrolidon e.g. PVP hexadecen copolymer and PVP eicosen copolymer which are available as Antaron V216 and Antaron V220 at GAF Chemicals corporations.
• Further suitable film forming agents include polymeric film formers such as sodiumpolystyrenesulfonate (e.g. Flexan 130 from National Starch and Chemical Corp.) and/ or polyisobuten (e.g. Rewopal PIB1000 from Rewo). Further suitable polymers are e.g.
• polyacrylamide (Seppigel 305), polyvinylalkohole, PVP, PVP/VA copolymers, polyglycols and acrylate/octylacralymid copolymers (e.g. Dermacryl 79).
• hydrated castor oil dimerdilinoleat (CAS 646054-62-8, I NCI Hydrogenated Castor Oil Dimer Dilinoleate), or PPG-3 Benzylethermyristate (CAS 403517-45-3).
• compositions according to the invention may further comprise one or several compounds from the group of siloxanes elastomers listed in order to enhance the water resistance and/ or enhance the light protection factor such as in particular siloxanes elastomers in the form of spherical powders with the I NCI nomenclature Dimethicone/Vinyl Dimethicone Crosspolymer, such as e.g. DOW CORNING 9506 Powder (by Dow corning)
• siloxane elastomer is used in combination with hydrocarbon oils, synthetic oils, synthetic esters, synthetic ether or mixtures thereof.
• composition refers in particular to a cosmetic composition that can be topically applied to mammalian keratinous tissue, particularly human skin and hair.
• cosmetic preparation or “cosmetic composition” as used in the present application refers to cosmetic compositions as defined under the heading "Kosmetika” in Rompp Lexikon Chemie, 10th edition 1997, Georg Thieme Verlag Stuttgart, New York as well as to cosmetic compositions as disclosed in A. Domsch, "Cosmetic Preparations", Verlag fur chemische Industrie (ed. H. Ziolkowsky), 4 th edition, 1992.
• Preferred topical compositions according to the invention are skin care preparations, hair care preparations, decorative preparations, and functional preparations.
• skin care preparations are, in particular, light protective preparations, anti- ageing preparations, preparations for the treatment of photo-ageing, body oils, body lotions, body gels, treatment creams, skin protection ointments, skin powders, moisturizing gels, moisturizing sprays, face and/or body moisturizers, skin-tanning preparations (i.e. compositions for the artificial/sunless tanning and/or browning of human skin), for example self-tanning creams as well as skin lightening preparations.
• care preparations are hair-washing preparations in the form of shampoos, hair conditioners, hair-care preparations such as e.g. pretreatment preparations, hair tonics, styling creams, gels such as styling gels, pomades, hair rinses, treatment packs, intensive hair treatments, hair- straightening preparations, liquid hair-setting preparations, hair foams (hair mousses) and hairsprays.
• hair-washing preparations in the form of shampoos, hair conditioners, hair-care preparations such as e.g. pretreatment preparations, hair tonics, styling creams, gels such as styling gels, pomades, hair rinses, treatment packs, intensive hair treatments, hair- straightening preparations, liquid hair-setting preparations, hair foams (hair mousses) and hairsprays.
• Examples of decorative preparations are, in particular, lipsticks, eye shadows, mascaras, dry and moist make-up formulations, rouges and/or powders.
• Examples of functional preparations are cosmetic or pharmaceutical compositions containing active ingredients such as hormone preparations, vitamin preparations, vegetable extract preparations, anti-ageing preparations, and/or antimicrobial (antibacterial or antifungal) preparations without being limited thereto.
• the topical compositions according to the invention are light- protective preparations, such as sun protection milks, sun protection lotions, sun protection creams, sun protection oils, sun blocks or tropical's or day care creams with a SPF (sun protection factor).
• sun protection creams, sun protection lotions, sun protection milks and sun protection preparations in the form of a spray or aerosol are light- protective preparations, such as sun protection milks, sun protection lotions, sun protection creams, sun protection oils, sun blocks or tropical's or day care creams with a SPF (sun protection factor).
• SPF sun protection factor
• topical compositions are hair-washing preparations in the form of shampoos or hair treatment preparations intended to be left in the hair (and not washed out) such as hair-setting preparations, hairsprays, gels, pomades, styling creams or hair foams (hair mousses), particularly hairsprays, gels or hair foams (hair mousses).
• a shampoo may, for example, have the following composition: from 0.01 to 5 % by weight of a polyglycerol based UV filter according to the present invention, 12.0 % by weight of sodium laureth-2-sulfate, 4.0 % by weight of cocamidopropyl betaine, 3.0 % by weight of sodium chloride, and water ad 100%.
• the topical compositions according to the present invention may be in the form of a suspension or dispersion in solvents or fatty substances, or alternatively in the form of an emulsion or micro emulsion (in particular of O/W- or W/O-type, Si/W- or W/Si-type), PIT- emulsion, multiple emulsion (e. g. 0/W/O- or W/O/W-type), pickering emulsion, hydrogel, alcoholic gel, lipogel, one- or multiphase solution or vesicular dispersion or other usual forms, which can also be applied by pens, as masks or as sprays.
• the topical compositions are in the form of an emulsion or dispersion.
• the topical compositions according to the invention are in the form of an O/W emulsion.
• the topical composition according to the invention contains advantageously at least one O/W- or Si/W-emulsifier selected from the list of glycerylstearatcitrate, glycerylstearate (self emulsifying), stearic acid, salts of stearic acid, polyglyceryl-3-methylglycosedistearate, ceteareth-20, steareth-2, steareth-12, PEG-40 stearate,
• Further suitable emulsifiers are phosphate esters and the salts thereof such as cetyl phosphate (Amphisol ® A), diethanolamine cetyl phosphate (Amphisol ® DEA), potassium cetyl phosphate (Amphisol ® K), sodiumcetearylsulfat, sodium glyceryl oleate phosphate, hydrogenated vegetable gly
• emulsifiers are sorbitan oleate, sorbitan sesquioleate, sorbitan isostearate, sorbitan trioleate, Lauryl Glucoside, Decyl Glucoside, Sodium Stearoyl Glutamate, Sucrose Polystearate and Hydrated Polyisobuten.
• one or more synthetic polymers may be used as an emulsifier.
• the at least one O/W emulsifier is preferably used in an amount of about 0.001 to 10 wt.-%, more preferably in an amount of 0.1 to 7 wt.-% with respect to the total weight of the composition.
• topical composition contains advantageously at least one co-emulsifier selected from the list of alkyl alcohols such as Cetyl Alcohol (Lorol C16, Lanette 16) Cetearyl Alcohol (Lanette O), Stearyl Alcohol (Lanette 18), Behenyl Alcohol (Lanette 22), Glyceryl Monostearate, Glyceryl Myristate (Estol 3650), Hydrogenated Coco- Glycerides (Lipocire Na10) without being limited to this and mixtures thereof.
• the topical compositions according to the invention are W/O emulsions.
• the topical composition according to the invention is a W/O emulsion, then it contains advantageously at least one W/O- or W/Si-emulsifier selected from the list of polyglyceryl-2-dipolyhydroxystearat, PEG-30 dipolyhydroxystearat, cetyl dimethicone copolyol, polyglyceryl-3 diisostearate polyglycerol esters of oleic/isostearic acid, polyglyceryl-6 hexaricinolate, polyglyceryl-4-oleate, polygylceryl-4 oleate/PEG-8 propylene glycol cocoate, magnesium stearate, sodium stearate, potassium laurate, potassium ricinoleate, sodium cocoate, sodium tallowate, potassium castorate, sodium oleate, and mixtures thereof.
• W/O- or W/Si-emulsifier selected from the list of polyglyceryl-2-dipolyhydroxystearat, PEG-30
• W/Si-emulsifiers are Lauryl Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone and/or PEG-9 Polydimethylsiloxyethyl Dimethicone.
• the at least one W/O emulsifier is preferably used in an amount of about 0.001 to 10 wt.-%, more preferably in an amount of 0.2 to 7 wt.-% with respect to the total weight of the composition.
• the topical compositions according to the invention particularly exhibit a pH in the range of 3-10, preferably in the range of pH of 5-8, most preferred in the range of pH 4-6 which can be adjusted with conventional acids, bases or buffering solutions.
• a typical "leave- on" composition like a skin care emulsion or light-protective preparation, for example, is usually applied in an amount of about 0.5 to about 2mg per cm 2 skin.
• the applied amount is normally not critical, and the desired effect(s) may be achieved by using more of the composition, repeating the application of the composition and/or applying a composition which contains more of the active ingredient(s).
• a topical composition as used herein a topical composition is meant which after having applied to the skin, is not removed intentionally. It is preferably left on the skin for a period of at least about 15 minutes, more preferably at least about 30 minutes, even more preferably at least about 1 hour, most preferably for at least several hours, e. g. up to about 12 hours.
• compositions according to the invention are in particular used for the protection against skin ageing (in particular photo ageing) and as sunscreen.
• Poly(glycerol-0-propylene oxide) was prepared according to Sunder, A.; Mijlhaupt, R.; Frey, H. Macromolecules, 2000, 33, 309-314.
• Poly(glycerol-0-propylene oxide) was prepared according to Sunder, A.; Mijlhaupt, R.; Frey, H. Macromolecules, 2000, 33, 309-314.
• the melt is cooled to 100°C and dissolved in pyridine.
• the solution is cooled to room temperature and 3,5,5-trimethylhexanoyl chloride (1 .6 g, 9 mmol) is added dropwise.
• the reaction mixture is stirred at 25°C for 4h. Excess of acid chloride is destroyed by the addition of water.
• the reaction mixture is evaporated to dryness and the residue solved in toluene.
• the organic phase is extracted with 10% aqueous citric acid, saturated aqueous sodium carbonate, dried over sodium sulfate, filtered, and evaporated to dryness.
• a highly viscous polymeric broadband UV filter is obtained, which shows typically an E ⁇ -value in THF of about 400 at 308 nm and about 390 at 352 nm.
• the solubility in dibutyl adipate is determined to be at least 50% (w/w).
• BMDBM butyl Methoxydibenzoylmethane, Parsol ® 1789
• BEMT bis- ethylhexyloxyphenol methoxyphenyl triazine, Tinosorb ® S
• solubility values 14 respectively 13 wt.-% which are in line with the values given by the suppliers (Merck/ CIBA).
• PG-UVAB1 and PG-UVAB2 are due to their high viscosity not free flowing and can therefore not be used as solvent for other solid UV absorbers such as BMDBM and BEMT itself.
• the solubility of BMDBM in a 1 :1 (w/w) mixture of C12-15 alkyl benzoate/ PG-UVAB1 of example 1 respectively PG-UVAB2 of example 2 was determined by saturation of the mixture with BMDBM and determination of the content of BMDBM in the supernatant by HPLC resulting in a solubility of 250mg/g, respectively 249mg/g.
• the solubility of BEMT in a 1 :1 (w/w) mixture of C12-15 alkyl benzoate/ PG-UVAB1 of example 1 was determined by dissolving 200 mg of BEMT in 800 mg of this mixture. Afterwards the solution was stored for 1 month at RT during which time no re-crystallization occurred resulting in a solubility of at least 20 wt.-% for BEMT.
• the solubility of BMDBM, respectively BEMT in C12-15 alkyl benzoate can be significantly enhanced by the use of PG-UVAB1 , respectively PG- UVAB2 as solubility enhancer.
• Example 3 Reduction of solvent necessary to dissolve solid UV-filter a.) 2.0 g of diisopropyl sebacate are necessary to solubilize 0.5 g BMDBM. However, only 1.4 g of a 1 :1 (w/w) mixture of PG-UVAB1 of example 1 and diisopropyl sebacate is needed to dissolve 0.5 g BMDBM resulting in a reduction of the cosmetic solvent necessary to dissolve BMDBM of 65%.
• Hybrane® S1200 (WO 99/16810) was supplied from DSM Hybrane (Geleen, The Netherlands) with a Mn of about 1200 g/mol as determined by GPC.
• Hybrane® S1200 (5.0 g, 4.2 mmol, 33.0 mmol OH), 2-(4-diethylamino-2- hydroxybenzoyl)benzoic acid methyl ester (3.6 g, 1 1 mmol), 1 ,8-diazabicyclol[5.4.0]undec- 7-ene (0.5 g, 3 mmol), and diglyme (2.5 g) is stirred at 160°C for 3 hours while argon is flushed continuously through the reaction mixture. 4-(dimethylamino)benzoyl chloride (2.2 g, 12 mmol) is added and the reaction mixture is stirred at 160°C for another 2 hours.
• Hybrane® S1200 (WO 99/16810) was supplied from DSM Hybrane (Geleen, The Netherlands) with a Mn of about 1200 g/mol as determined by GPC.
• Hybrane® D2000 (WO 99/16810) was supplied from DSM Hybrane (Geleen, The Netherlands) with a Mn of about 2000 g/mol as determined by GPC.
• Triethylamine (4.0 mL, 29.0 mmol) and DMAP (50 mg) is added to a solution of Hybrane® D2000 (5.0 g, 2.5 mmol, 20.0 mmol OH) in DCM (75 mL) under Argon at 0°C.
• a solution of 4-(dimethylamino)benzoyl chloride (4.5 g, 24 mmol) in DCM (25 mL) is added dropwise keeping the temperature below 5°C.
• the reaction mixture is stirred at room temperature for 48 h. Excess acid chloride is hydrolyzed by addition of water (100 mL) and stirring for another 12 h at room temperature.
• the solubility of BMDBM in a 1 :1 (w/w) mixture of C12-15 alkyl benzoate and a polymeric, respectively a solid UV-filter i.e. Polysilicone-15 (P-15), HY-B1 , HY-B2, HY-AB, BEMT or Ethylhexyltriazone (EHT)
• P-15 Polysilicone-15
• HY-B1 HY-B2
• HY-AB HY-AB
• BEMT Ethylhexyltriazone
• the solubility of BMDBM in C12-15 alkyl benzoate can neither be enhanced by a silicone based polymeric UV-filter (polysilicone-15), a Hybrane based UV-filter (HY-AB, HY-B1 , HY-B2) nor a solid UV-filter (BEMT or EHT).

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