WO2011070050A1 - Uv absorbing dentritic polyether prepared by polymerization of oxetanes - Google Patents
Uv absorbing dentritic polyether prepared by polymerization of oxetanes Download PDFInfo
- Publication number
- WO2011070050A1 WO2011070050A1 PCT/EP2010/069132 EP2010069132W WO2011070050A1 WO 2011070050 A1 WO2011070050 A1 WO 2011070050A1 EP 2010069132 W EP2010069132 W EP 2010069132W WO 2011070050 A1 WO2011070050 A1 WO 2011070050A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polymer
- group
- oxetane
- hyperbranched dendritic
- polyether backbone
- Prior art date
Links
- 239000004721 Polyphenylene oxide Substances 0.000 title claims abstract description 50
- 229920000570 polyether Polymers 0.000 title claims abstract description 50
- 238000006116 polymerization reaction Methods 0.000 title description 6
- 150000002921 oxetanes Chemical class 0.000 title description 2
- 239000000203 mixture Substances 0.000 claims abstract description 56
- 229920000642 polymer Polymers 0.000 claims abstract description 49
- 239000000126 substance Substances 0.000 claims abstract description 32
- 239000004904 UV filter Substances 0.000 claims abstract description 27
- AHHWIHXENZJRFG-UHFFFAOYSA-N oxetane Chemical compound C1COC1 AHHWIHXENZJRFG-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 12
- 238000007151 ring opening polymerisation reaction Methods 0.000 claims abstract description 11
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 31
- -1 p- aminobenzoyl- Chemical group 0.000 claims description 29
- 230000000699 topical effect Effects 0.000 claims description 19
- 229920005862 polyol Polymers 0.000 claims description 18
- 150000003077 polyols Chemical class 0.000 claims description 18
- 239000007858 starting material Substances 0.000 claims description 17
- 150000001875 compounds Chemical class 0.000 claims description 11
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical group CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 9
- NLQMSBJFLQPLIJ-UHFFFAOYSA-N (3-methyloxetan-3-yl)methanol Chemical group OCC1(C)COC1 NLQMSBJFLQPLIJ-UHFFFAOYSA-N 0.000 claims description 8
- KXTAOXNYQGASTA-UHFFFAOYSA-N 2-benzylidenepropanedioic acid Chemical group OC(=O)C(C(O)=O)=CC1=CC=CC=C1 KXTAOXNYQGASTA-UHFFFAOYSA-N 0.000 claims description 4
- 125000003104 hexanoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 125000002947 alkylene group Chemical group 0.000 claims description 3
- 125000003710 aryl alkyl group Chemical group 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 230000004224 protection Effects 0.000 abstract description 6
- 230000009931 harmful effect Effects 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 description 35
- 239000002537 cosmetic Substances 0.000 description 25
- 150000002148 esters Chemical class 0.000 description 14
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 6
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- WFSGQBNCVASPMW-UHFFFAOYSA-N 2-ethylhexanoyl chloride Chemical compound CCCCC(CC)C(Cl)=O WFSGQBNCVASPMW-UHFFFAOYSA-N 0.000 description 5
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- YBJHBAHKTGYVGT-ZKWXMUAHSA-N (+)-Biotin Chemical compound N1C(=O)N[C@@H]2[C@H](CCCCC(=O)O)SC[C@@H]21 YBJHBAHKTGYVGT-ZKWXMUAHSA-N 0.000 description 4
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- 125000004185 ester group Chemical group 0.000 description 4
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- OSCJHTSDLYVCQC-UHFFFAOYSA-N 2-ethylhexyl 4-[[4-[4-(tert-butylcarbamoyl)anilino]-6-[4-(2-ethylhexoxycarbonyl)anilino]-1,3,5-triazin-2-yl]amino]benzoate Chemical compound C1=CC(C(=O)OCC(CC)CCCC)=CC=C1NC1=NC(NC=2C=CC(=CC=2)C(=O)NC(C)(C)C)=NC(NC=2C=CC(=CC=2)C(=O)OCC(CC)CCCC)=N1 OSCJHTSDLYVCQC-UHFFFAOYSA-N 0.000 description 3
- 241000723346 Cinnamomum camphora Species 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
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- BOTWFXYSPFMFNR-PYDDKJGSSA-N phytol Chemical compound CC(C)CCC[C@@H](C)CCC[C@@H](C)CCC\C(C)=C\CO BOTWFXYSPFMFNR-PYDDKJGSSA-N 0.000 description 1
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- DCBSHORRWZKAKO-UHFFFAOYSA-N rac-1-monomyristoylglycerol Chemical compound CCCCCCCCCCCCCC(=O)OCC(O)CO DCBSHORRWZKAKO-UHFFFAOYSA-N 0.000 description 1
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- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/04—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers only
- C08G65/06—Cyclic ethers having no atoms other than carbon and hydrogen outside the ring
- C08G65/16—Cyclic ethers having four or more ring atoms
- C08G65/18—Oxetanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2603—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen
- C08G65/2606—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups
- C08G65/2609—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups containing aliphatic hydroxyl groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/002—Dendritic macromolecules
- C08G83/005—Hyperbranched macromolecules
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/10—Definition of the polymer structure
- C08G2261/13—Morphological aspects
- C08G2261/131—Morphological aspects dendritic
Definitions
- the present invention relates to a polymer comprising a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of at least one oxetane.
- Such polymers are particularly useful as UV-filter substances for example in compositions for the protection of the human skin and/or hair against harmful effects of sunlight.
- UV-filter substances have been developed in the past protecting against the harmful effect of UV-A (320-400 nm) and / or UV-B (290-320 nm) wavelength and even shorter wavelengths (UV-C). These chemicals are usually incorporated either alone or in combination with each other in cosmetic or pharmaceutical preparations which are widely known and used.
- UV-filter substance such as having excellent photostability, toxicological and dermatological acceptability, excellent heat stability, very good solubility in cosmetic solvents or water, processability into cosmetic formulations, compatibility with cosmetic bases, pH stability in the range of 4 to 9, compatibility with other ingredients of cosmetic formulations and with the packaging materials, no staining of textiles, it should be free of color and of neutral or pleasant odor, and it should be free of tackiness and have a low volatility.
- Polymeric UV-filter substances have received increasing attention during the last decade as government authorities place more and more stringent requirements on sunscreens in view of transdermal penetration in order to avoid any systemic exposure. But even though many polymeric UV-filters have been disclosed in the literature, this class still suffers from many disadvantages. At high chromophore loading the polymeric UV-filter substances are often highly viscous, honey-like products which are difficult to process industrially. Furthermore, they often show a lack of photostability as well as solubility, are laborious to prepare and to purify and, incorporated into a topical composition and applied to the skin lead to an unpleasant skin feel. At low chromophore loadings, the polymeric UV-filter substances often do not provide a sufficient sun protection factor (SPF).
- SPPF sun protection factor
- WO2005/092282 relates inter alia to a conjugate comprising a hyperbranched polymer covalently bonded to at least three UV absorbing chromophores having an UV absorption maximum max >270nm, wherein the hyperbranched polymer is obtainable by polycondensation or polyaddition of one ore more building blocks AB 2 .
- the building block AB 2 is glycidol.
- the glycidol based UV-filter substances disclosed in WO2005/092282 are highly viscous oils which renders their handling very difficult. Furthermore, they exhibit a limited solubility in cosmetic oils. Hyperbranched dendritic polymers are known from the prior art and encompasses dendrimers and hyperbranched polymers.
- Dendritic polymers in contrast to linear polymers or ordinarily and randomly branched polymers is the absence of entanglements and the low viscosity in bulk.
- Dendritic polymers are based on for instance AB X monomers and are highly branched macromolecules with a multitude of end-groups. Dendrimers are monodisperse, exact structures where all branch points are utilized. Due to their well defined structure dendrimers are tedious and often expensive to synthesize.
- Hyperbranched polymers are polydisperse and some of the AB X monomers are incorporated in a linear fashion, resulting in a less well defined architecture. Hyperbranched polymers are less complicated to synthesize and, therefore, less expensive which makes them more attractive than dendrimers for large-scale applications.
- polymers comprising a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of at least one oxetane as AB 2 monomer overcome the disadvantages of the prior art outlined above.
- inventive polymers show a good solubility in cosmetic solvents as well as an outstanding skin compatibility and stability (light, heat, moisture).
- the polymers according to the invention are solid and can thus easily be handled even in industrial scale.
- Compositions comprising a polymer according to the invention furthermore exhibit excellent sensorial properties e.g. in regard of skin feel.
- the invention relates to a polymer comprising a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of at least one oxetane. s preferably a compound of the general formula (I)
- R 1 represents H, a Ci to C 4 alkyl group, an aryl group or an arylalkyl group and
- R 2 represents a Ci to C 4 alkylene group.
- alkyl groups which may be represented by R 1 are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec. -butyl and t-butylgroups of which the preferred groups are methyl and ethyl, especially the methyl groups.
- alkylene groups which may be represented by R 2 include the methylene, ethylene, trimethylene, propylene, tetramethylene, ethylethylene and methyltrimethylene groups of which the methylene and ethylene groups are preferred, the methylene group being the most preferred.
- R 1 is methyl or ethyl and R 2 is methyl.
- the most preferred oxetane in all embodiments of the invention is 3-methyl-3-hydroxymethyl oxetane.
- the hyperbranched dendritic polyether backbone is obtainable by a one step polymerization using oxetane as AB 2 -type monomer i.e. building block.
- the polymerization reaction may be initiated by the oxetane itself or by a polyol starter unit.
- the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of oxetane with the definitions and preferences as given above.
- a polyol starter unit is used in the preparation of the hyperbranched dendritic polyether backbone.
- the hyperbranched dendritic polyether backbone according to the invention has terminal hydroxyl groups which are suitable for the attachment of the at least one UV absorbing chromophore.
- polyol starter units include 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, glycidol, 1 ,3,5-tris(2-hydroxyethyl)cyanuric acid, 1 ,3- bis[tris(hydroxymethyl)methylamino]propane, BIS-TRIS ['2,2-bis(hydroxyethyl)-(iminotris)- (hydroxymethyl)-methane], N,
- the polyol starter unit is preferably selected from pentaerythritol, dipentaerythritol and/ or trimethylolpropane, most preferably the polyol starter unit is trimethylolpropane.
- ring-opening polymerization refers to a form of addition polymerization, in which the terminal end of a polymer acts as a reactive center where further cyclic monomeric building blocks, i.e. the oxetane join to form a larger polymer chain through ionic propagation.
- the reactive center of the propagating chain is a carbocation the polymerization is called cationic ring-opening polymerization and when the active center is a carbanion 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 acid. 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 hydrid.
- preferred catalysts are potassium hydride and/or potassium methylate.
- An exemplary process for the preparation of a hyperbranched dendritic polyether backbone using 3-methyl-3-hydroxymethyl oxetane as starter as well as building block is illustrated below. In basic medium the primary hydroxyl groups of 3-methyl-3-hydroxymethyl oxetane are deprotonated thereby initiating an anionic ring-opening multibranching polymerization (ROMBP).
- ROMBP anionic ring-opening multibranching polymerization
- the hyperbranched dendritic polyether backbone comprises at least one oxetane building block with the preferences and definitions as given above per molecule.
- the hyperbranched dendritic polyether backbone comprises an average number of 2 to 600, more preferably of 2 to 250, most preferably of 3 to 100, in particular of 4 to 25 oxetane building blocks per molecule.
- the hyperbranched dendritic polyether backbone is obtainable by a ring- opening polymerization of only oxetane with the preferences and definitions as given above as building block and wherein either the oxetane itself acts as starter unit or a polyol starter unit is used.
- a polyol starter unit with the definitions and preferences as given above is used.
- the invention relates to a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of oxetane, optionally using a polyol starter unit.
- the oxetane is 3-methyl-3-hydroxymethyl oxetane and/ or 3-ethyl-3-hydroxymethyl oxetane and the polyol starter unit is selected from pentaerythritol, dipentaerythritol and/ or trimethylolpropane, most preferably the oxetane is 3-methyl-3-hydroxymethyl and the polyol starter unit is trimethylolpropane.
- the hyperbranched dendritic polyether backbone is covalently bound to at least one, preferably to at least two, more preferably to at least three, most preferably to at least four, in particular to at least five UV absorbing chromophores.
- all terminal hydroxyl groups of the hyperbranched dendritic polyether backbone can be functionalized with a UV absorbing chromophore.
- the UV absorbing chromophores may be of a different or of the same type. Preferably, all UV absorbing chromophores are identical.
- the UV absorbing chromophores covalently bound via an oxygen bridge to the hyperbranched dendritic polyether backbone comprise all groups which absorb light in the range of wavelengths 400 nm to 320 nm (UV-A) and 320 nm to 290 nm (UV-B) or of even shorter wavelengths (UV-C) and which are or can be used as chemical UV-filter substances.
- the UV absorbing chromophores are derived from chromophores which are known UV-filter substances.
- the UV absorbing chromophores are derived from commercially available UV-filter substances as e.g. listed in the CTFA Cosmetic ingredient Handbook or "The Encyclopedia of Ultraviolet Filters" (ISBN: 978-1- 932633-25-2) by Nadim A. Shaath.
- Suitable UV absorbing chromophores encompass derivatives of acrylates such as e.g. 2- cyano-3,3-diphenylacrylate, of p-aminobenzoates such as e.g. p-dimethylaminobenzoate, of camphor such as e.g. 4-methyl benzylidene camphor, of cinnamates such as e.g. 4- methoxycinnamate, of benzophenones such as e.g.
- preferred groups of UV absorbing chromophores are groups derived from p-aminobenzoic acid such as e.g. p-dimethylaminobenzoic acid, amino substituted hydroxybenzophenones such as e.g. 2-[4-diethylaminobenzoyl]benzoic acid, cinnamic acid such as e.g. 4-methoxycinnamic acid, benzalmalonate such as e.g. [(4- hydroxyphenyl)methylene] propanedioate, in particular groups derived from p-aminobenzoic acid such as p-dimethylaminobenzoic acid.
- p-aminobenzoic acid such as e.g. p-dimethylaminobenzoic acid
- amino substituted hydroxybenzophenones such as e.g. 2-[4-diethylaminobenzoyl]benzoic acid
- cinnamic acid such as
- the at least one UV absorbing chromophore is covalently bound via an oxygen bridge to the hyperbranched dendritic polyether backbone.
- the oxygen atom of the oxygen bridge may either be derived from a hydroxyl group of the UV absorbing chromophore or from the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone.
- the linkage can be in the form of an ether-, an ester-, an urethane-, an amide-, a phenol ether- or a carbonate-group without being limited thereto.
- the linkage is in the form of an ether-or an ester-group, most preferably the linkage is an ester group.
- the polymers according to the present invention may be prepared by reacting the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone with an UV absorbing chromophore as defined above having a functional group capable of reacting with the hydroxyl groups of the hyperbranched dendritic polyether backbone.
- Suitable functional groups include carboxyl-, ester-, acylhalogenide-, halogenide, anhydride, epoxide or isocyanate groups without being limited thereto.
- the attachment can be performed by known method to a person skilled in the art, e.g. by reacting an acid chloride of a UV absorbing chromophore with the terminal hydroxyl groups of the hyperbranched dendritic polyether in the presence of a base such as pyridine.
- An alternative method includes the transesterification of a UV-absorbing chromophore which is an ester such as e.g.
- esters are for example the methyl or the ethyl esters, in particular the methyl esters.
- the oxygen atom of the oxygen bridge is derived from a hydroxyl group of the UV- absorbing chromophore
- the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone must be activated prior to the reaction.
- the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are converted to leaving groups such as e.g. bromides, chlorides, mesylates, tosylates or triflates.
- leaving groups such as e.g. bromides, chlorides, mesylates, tosylates or triflates.
- the terminal hydroxyl groups of the hyperbranched dendritic polyether may be reacted with mesylchloride in the presence of a tertiary amine or with SOCI 2 in order to enhance the leaving group quality of the hydroxyl groups of the hyperbranched dendritic polyether backbone (activation).
- the activated hyperbranched dendritic polyether backbone is reacted e.g. with a deprotonated hydroxyl group of a suitable UV absorbing chromophore in a nudeophilic substitution reaction thereby forming an ether bond.
- the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are reacted with an acid chloride or an ester of a UV absorbing chromophore.
- the UV absorbing chromophore which is reacted with the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone is an ester of p-dimethylaminobenzoic acid such as in particular methyl p-dimethylaminobenzoate, ethyl p-dimethylaminobenzoate, methyl p-diethylaminobenzoate or ethyl p-diethylaminobenzoate most in particular methyl p- dimethylaminobenzoate or ethyl p-dimethylaminobenzoate.
- Suitable capping agents include anhydrides or acid chlorides or acid esters of Ci to C 20 linear or branched alkanoic acids such as such as e.g. acetanhydride, acetylchloride, 2-ethyl hexanoic acid (m)ethyl ester or 2-ethyl hexanoic acid chloride.
- acetanhydride acetylchloride
- 2-ethyl hexanoic acid (m)ethyl ester or 2-ethyl hexanoic acid chloride The skilled person is aware of further suitable capping agents which can be used to introduce the corresponding capping groups.
- the residual hydroxyl groups of the hyperbranched dendritic polyether according to the invention are capped, preferably with acetanhydride, acetyl chloride and/ or 2-ethyl hexanoic acid chloride or ester, most preferably with 2-ethyl hexanoic acid chloride or ester.
- the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are linked to a UV absorbing chromophore and the residual terminal hydroxyl groups are linked to a capping group, in particular to a 2-ethyl hexanoyl-group.
- the invention relates to a polymer consisting of a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of oxetane, optionally and preferably in the presence of a polyol starter unit, in particular trimethylolpropane and wherein 30 - 100%, most preferably 70 - 90% of the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are linked to a UV absorbing chromophore and the residual terminal hydroxyl groups are linked to a capping group, in particular to a 2- ethyl hexanoyl-group.
- the oxetane is 3-methyl-3- hydroxymethyl oxetane
- the polyol starter unit is trimethylolpropane
- 70-90% of the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are linked to the same UV absorbing chromophore and the residual hydroxyl groups are linked to a 2-ethyl hexanoyl-group.
- the polymer according to the invention has a number average molecular weight M n within the range of from 500 to 50,000 g mol "1 , more preferably 750 to 25,000 g mol "1 , most preferably 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 DI N 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 polymers according to the present invention are particularly useful as UV filters 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 polymers according to the 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. photoaging.
- the polymers according to the present invention are also suitable to protect natural or artificial hair color.
- the polymers in accordance with the invention are colorless or light yellowish, liquid, crystalline or semi-liquid substances. They are distinguished by high photostability, good solubility in organic solvents, especially cosmetic solvents, and a short and economical synthetic route.
- the polymers of the invention can be incorporated well into oil- and/ or fat-containing topical compositions.
- the polymers of the invention in accordance with the invention are superior to comparable glycidol based UV-filter substances referred to earlier as the polymers of the invention fulfill the criteria which are required in the present instance, namely a high solubility in cosmetic solvents such as e.g.
- C12-15 alkyl benzoate e.g., FINSOLV TN [Finetex Inc.]
- isopropyl myristate e.g., DELTYL EXTRA, [Givaudan Roure Vernier, Switzerland]
- PPG 15-stearyl ether e.g., ARLAMOL E, [ICI Surfactants Everberg 1 Belgium]
- cocoyl capylate/caprate e.g., CETIOL LC, [sold by Henkel KGaA, Dusseldorf Germany]
- diisopropyl adipate e.g., CRODAMOL DA, [Croda Universal Ltd., North Humberside, England]
- the polymers according to the invention are therefore suitable for the incorporation as UV- filter substances in topical compositions such as in cosmetic, pharmaceutical and veterinary medical preparations.
- the polymers can be used both in dissolved form and in the micronized state.
- compositions preferably to topical compositions comprising a polymer according to the invention and a cosmetically acceptable carrier.
- the amount of the polymer according to the invention 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 are incorporated.
- topical 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.
- the topical compositions according to the present invention are 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 C7W- or W/O-type), PIT-emulsion, multiple emulsion (e. g. C7W/0- 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 composition is or comprises an emulsion it can also contain one or more anionic, nonionic, cationic or amphoteric surfactant(s).
- Preferred topical compositions according to the invention are skin care preparations, decorative preparations, light protection preparations and functional preparations.
- Examples of skin care preparations are, in particular, body oils, body lotions, body gels, treatment creams, skin protection ointments, shaving preparations, such as shaving foams or gels, skin powders such as baby powder, moisturizing gels, moisturizing sprays, revitalizing body sprays, cellulite gels, face and/or body moisturizers, facial and/or body cleansers, face masks, anti acne preparations and/or peeling preparations.
- Examples of decorative preparations are, in particular, lipsticks, eye shadows, mascaras, dry and moist make-up formulations, rouges, powders, and/or suntan lotions.
- 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.
- Topical compositions in accordance with the invention can be in the form of a liquid, lotion, a thickened lotion, a gel, a cream, a milk, an ointment, a paste, a powder, a make-up, or a solid tube stick and can be optionally be packaged as an aerosol and can be provided in the form of a mousse such as a aerosol mousse, a foam or a spray foam, a spray, a stick, a plaster, a cleanser, a soap or a wipe.
- a mousse such as a aerosol mousse, a foam or a spray foam, a spray, a stick, a plaster, a cleanser, a soap or a wipe.
- the topical composition contains at least one polymer according to the invention, optionally in combination with further ingredients such as ingredients for skin lightening; tanning prevention; treatment of hyperpigmentation; preventing or reducing acne, wrinkles, lines, atrophy and/or inflammation; as well as topical anesthetics; antimicrobial and/or antifungal agents; chelators and/or sequestrants; anti- cellulites agents (e.g. phytanic acid) and/or further UV-filter substances and carriers and/or excipients or diluents conventionally used in topical compositions. If nothing else is stated, the excipients, additives, diluents, etc. mentioned in the following are suitable for topical compositions according to the present invention.
- the necessary amounts of the cosmetic and dermatological adjuvants and additives can, based on the desired product, easily be determined by the skilled person.
- the cosmetically active ingredients useful herein can in some instances provide more than one benefit or operate via more than one mode of action.
- cosmetically active ingredients 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), iodopropyl butylcarbamate, glycerol, urea, guanidine (e.g.
- peptides e.g., MatrixylTM [pentapeptide derivative]
- oligopeptides e.g., wax-based synthetic peptides (e.g., octyl palmitate and tribehenin and sorbitan isostearate and palmitoyl-oligopeptide), iodopropyl butylcarbamate, glycerol, urea, 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,
- cosmetically active ingredients are vitamin C (ascorbic acid) and/or its derivatives (e.g. ascorbyl phosphate such as Stay C (sodium ascorbyl monophosphate) from DSM Nutritional Products Ltd.), 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 , biotin, co-enzyme Q10, EGCG, hydroxytyrosol and/or olive extract.
- vitamin C ascorbic acid
- its derivatives e.g. ascorbyl phosphate such as Stay C (sodium ascorbyl monophosphate) from DSM Nutritional Products Ltd.
- vitamin A and/or its derivatives e.g., retinoid derivatives such as retinyl palmitate or retinyl propionate
- the topical cosmetic 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, sunscreens, antifoaming agents, moisturizers, 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, antifoaming agents, pigments or nanopigments, e.g.
- cosmetic adjuvants and additives such as preservatives/ antioxidants, fatty substances/ oils, water, organic solvents, silicones, thickeners, softeners, emulsifiers, sunscreens, antifoaming agents, moisturizers, aesthetic components such as fragrances, surfactants
- cosmetic ingredients those suited for providing a photoprotective effect by physically blocking out ultraviolet radiation, or any other ingredients usually formulated into cosmetic compositions.
- 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 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.
- 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.
- cosmetic compositions for the skin are light-protective preparations, such as sun milks, lotions, creams, oils, sunblocks or tropicals, pretanning preparations or after-sun preparations, also skin-tanning preparations (i.e. compositions for the artificial/sunless tanning and/or browning of human skin), for example self-tanning creams.
- skin-tanning preparations i.e. compositions for the artificial/sunless tanning and/or browning of human skin
- self-tanning creams for example self-tanning creams.
- sun protection creams sun protection lotions
- sun protection milk and sun protection preparations in the form of a spray are special importance as cosmetic compositions for the hair.
- preparations for hair treatment especially hair-washing preparations in the form of shampoos, hair conditioners, hair-care preparations, e.g.
- pretreatment preparations hair tonics, styling creams, styling gels, pomades, hair rinses, treatment packs, intensive hair treatments, hair- straightening preparations, liquid hair-setting preparations, hair foams and hairsprays.
- hair-washing preparations in the form of shampoos.
- a shampoo may, for example, have the following composition: from 0.01 to 5 % by weight of a polymer according to the 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 fatty substances can be an oil or a wax, or mixture 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. degree. 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.sub.12 -C.sub.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.sub
- Exemplary waxy compounds are paraffin wax, carnauba wax, beeswax or hydrogenated castor oil.
- exemplary organic solvents include the lower alcohols and polyols having at most 8 carbon atoms.
- the thickeners are advantageously selected, in particular, from among the crosslinked polyacrylic acids or modified or unmodified guar gums and celluloses, such as hydroxypropylated guar gum, methylhydroxyethylcellulose and hydroxypropylmethylcellulose.
- UV-A and/or UV-B and/ or broad spectrum UV-filter substances may be added into the topical compositions of the invention.
- the combination of UV-filter substances may show a synergistic effect.
- additional UV-filter substances are advantageously selected from among the compounds listed below without being limited thereto:
- UV-B or broad spectrum filter substances i.e. substances having absorption maximums between about 290 nm and 340 nm may be organic or inorganic compounds.
- Organic UV-B or broadband screening agents are e.g. 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 methoxycin
- 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 (Uvasorb HEB) and the like.
- salicylate derivatives such as isopropylbenzyl salicylate, benzyl salicylate, butyl salicylate, ethylhexyl salicylate (PARSOL ® EHS, Neo Heliopan OS), isooctyl salicylate or homomenthyl salicylate (homosalate, PARSOL ®
- Encapsulated UV-filters such as encapsulated ethylhexyl methoxycinnamate (Eusolex UV- pearls) or microcapsules loaded with UV-filters as e.g. dislosed in EP 1471995 and the like;
- Examples of broad spectrum or UV A screening agents i.e. substances having absorption maximums between about 320 nm and 400 nm may be organic or inorganic compounds 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; bis-ethylhexyloxyphenol methoxyphenyl triazine (Tinosorb S) 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) (Neoheliopan AP); amino substituted hydroxy
- microparticulated refers to a particle size from about 5 nm to about 200 nm, particularly from about 15 nm to about 100 nm.
- the particles 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 term "conventional UV-A screening agent” also refers to dibenzoylmethane derivatives such as e.g. PARSOL ® 1789 stabilized by, e.g. 3,3-Diphenylacrylate derivatives as described in the European Patent Publications EP 0 514 491 B1 and EP 0 780 1 19 A1 ; Benzylidene camphor derivatives as described in the US Patent No. 5,605,680; Organosiloxanes containing benzmalonate groups as described in the European Patent Publications EP 0358584 B1 , EP 0538431 B1 and EP 0709080 A1.
- dibenzoylmethane derivatives such as e.g. PARSOL ® 1789 stabilized by, e.g. 3,3-Diphenylacrylate derivatives as described in the European Patent Publications EP 0 514 491 B1 and EP 0 780 1 19 A1 ; Benzylidene camphor derivatives as described in the US Patent
- the UV-filter substances are generally present in the compositions according to the invention in proportions ranging from 0.1 to 20 wt.-%, preferably ranging from 0.2 to 15 wt- %, most preferably ranging from 0.5 to 10 wt.-% with respect to the total weigh of the composition.
- compositions according to the invention are preferably formulated an oil-in-water or water-in-oil emulsion.
- the cosmetic and/ or dermatological compositions according to the invention have a pH in the range of 3-10, preferably in the range of pH of 4-8, most preferred in the range of pH 4- 6.
- the polymeric filter showed an E ⁇ -value of 812 in THF at 308 nm.
- the solubility in Finsolv TN (C-12-15 alkyl benzoate) was determined to be at least 25% (w/w).
- the Mn has been determined by GPC using polystyrene standards to be 1700 g/mol.
- Polyglycerol was prepared according to Sunder, A.; Mijlhaupt, R.; Frey, H. Macromolecules, 2000, 33, 309-314.
- the polymeric filter showed an E ⁇ -value of 805 in THF at 310 nm.
- the product showed a solubility of less than 5wt.-% in Finsolv TN at 50°C.
- the Mn has been determined by GPC using polystyrene standards to be 1670 g/mol.
- the solubility was measured by adding to a mixture of 50 mg of the polymeric UV filter and 150 mg of Finsolv TN in 5 minutes intervals subsequently additional 100 mg portions of Finsolv TN at 50°C until the polymer has been completely dissolved. After each solvent addition the sample was cooled to room temperature and the solubility was checked. The solution remains clear and transparent when the polymer is completely solved. Insoluble polymers result in a cloudy liquid, which separates on standing in a polymer and a solvent phase.
- the compound according to the invention shows a higher solubility at equal chromophore loading and molecular weight compared to the respective glycidol based UV-filter substance.
- the in vitro SPF (Sun Protection Factor) of the following topical composition was determined according to the COLIPA protocol as described in the Guideline "Method for the in vitro determination of UVA protection provided by sunscreen products" to give an in vitro SPF of 8.
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Abstract
The present invention relates to a polymer comprising a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of at least one oxetane. Such polymers are particularly useful as UV-filter substances for example in compositions for the protection of the human skin and/or hair against harmful effects of sunlight.
Description
UV ABSORBING DENTRITIC POLYETHER PREPARED BY POLYMERIZATION OF
OXETANES
The present invention relates to a polymer comprising a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of at least one oxetane. Such polymers are particularly useful as UV-filter substances for example in compositions for the protection of the human skin and/or hair against harmful effects of sunlight.
Many UV-filter substances have been developed in the past protecting against the harmful effect of UV-A (320-400 nm) and / or UV-B (290-320 nm) wavelength and even shorter wavelengths (UV-C). These chemicals are usually incorporated either alone or in combination with each other in cosmetic or pharmaceutical preparations which are widely known and used.
There are many requirements on a UV-filter substance such as having excellent photostability, toxicological and dermatological acceptability, excellent heat stability, very good solubility in cosmetic solvents or water, processability into cosmetic formulations, compatibility with cosmetic bases, pH stability in the range of 4 to 9, compatibility with other ingredients of cosmetic formulations and with the packaging materials, no staining of textiles, it should be free of color and of neutral or pleasant odor, and it should be free of tackiness and have a low volatility.
Polymeric UV-filter substances have received increasing attention during the last decade as government authorities place more and more stringent requirements on sunscreens in view of transdermal penetration in order to avoid any systemic exposure. But even though many polymeric UV-filters have been disclosed in the literature, this class still suffers from many disadvantages. At high chromophore loading the polymeric UV-filter substances are often highly viscous, honey-like products which are difficult to process industrially. Furthermore, they often show a lack of photostability as well as solubility, are laborious to prepare and to purify and, incorporated into a topical composition and applied to the skin lead to an
unpleasant skin feel. At low chromophore loadings, the polymeric UV-filter substances often do not provide a sufficient sun protection factor (SPF).
Therefore, there is an ongoing need for novel polymeric UV-filter substances which meet the above mentioned requirement and which are in particular industrial processible even at a high chromophore loading.
WO2005/092282 relates inter alia to a conjugate comprising a hyperbranched polymer covalently bonded to at least three UV absorbing chromophores having an UV absorption maximum max >270nm, wherein the hyperbranched polymer is obtainable by polycondensation or polyaddition of one ore more building blocks AB2. Preferably, the building block AB2 is glycidol. The glycidol based UV-filter substances disclosed in WO2005/092282, however, are highly viscous oils which renders their handling very difficult. Furthermore, they exhibit a limited solubility in cosmetic oils. Hyperbranched dendritic polymers are known from the prior art and encompasses dendrimers and hyperbranched polymers. The most characteristic feature of dendritic polymers in contrast to linear polymers or ordinarily and randomly branched polymers is the absence of entanglements and the low viscosity in bulk. Dendritic polymers are based on for instance ABX monomers and are highly branched macromolecules with a multitude of end-groups. Dendrimers are monodisperse, exact structures where all branch points are utilized. Due to their well defined structure dendrimers are tedious and often expensive to synthesize. Hyperbranched polymers are polydisperse and some of the ABX monomers are incorporated in a linear fashion, resulting in a less well defined architecture. Hyperbranched polymers are less complicated to synthesize and, therefore, less expensive which makes them more attractive than dendrimers for large-scale applications.
Surprisingly, it has been found that polymers comprising a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of at least one oxetane as AB2 monomer overcome the disadvantages of the prior art outlined above. In particular the inventive
polymers show a good solubility in cosmetic solvents as well as an outstanding skin compatibility and stability (light, heat, moisture). Furthermore, at high chromophore loading, the polymers according to the invention are solid and can thus easily be handled even in industrial scale. Compositions comprising a polymer according to the invention furthermore exhibit excellent sensorial properties e.g. in regard of skin feel.
Thus, the invention relates to a polymer comprising a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of at least one oxetane. s preferably a compound of the general formula (I)
R1 represents H, a Ci to C4 alkyl group, an aryl group or an arylalkyl group and
R2 represents a Ci to C4 alkylene group.
Examples of alkyl groups which may be represented by R1 are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec. -butyl and t-butylgroups of which the preferred groups are methyl and ethyl, especially the methyl groups. Examples of alkylene groups which may be represented by R2 include the methylene, ethylene, trimethylene, propylene, tetramethylene, ethylethylene and methyltrimethylene groups of which the methylene and ethylene groups are preferred, the methylene group being the most preferred. In all embodiments of the invention preferably R1 is methyl or ethyl and R2 is methyl. The most preferred oxetane in all embodiments of the invention is 3-methyl-3-hydroxymethyl oxetane.
The hyperbranched dendritic polyether backbone is obtainable by a one step polymerization using oxetane as AB2-type monomer i.e. building block. The polymerization reaction may be initiated by the oxetane itself or by a polyol starter unit. In particular, the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of oxetane with the definitions and preferences as given above. In all embodiment of the invention
preferably a polyol starter unit is used in the preparation of the hyperbranched dendritic polyether backbone. The hyperbranched dendritic polyether backbone according to the invention has terminal hydroxyl groups which are suitable for the attachment of the at least one UV absorbing chromophore. Examples of polyol starter units include 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, glycidol, 1 ,3,5-tris(2-hydroxyethyl)cyanuric acid, 1 ,3- bis[tris(hydroxymethyl)methylamino]propane, BIS-TRIS ['2,2-bis(hydroxyethyl)-(iminotris)- (hydroxymethyl)-methane], N,N,N',N'-tetrakis(2-hydroxyethyl) ethylenediamine, triethanolamine, diglycerol, glucose, fructose, sucrose, galactose, lactose, maltose, mannitol, dulcitol, threitol, sorbitol. In all embodiments of the invention the polyol starter unit is preferably selected from pentaerythritol, dipentaerythritol and/ or trimethylolpropane, most preferably the polyol starter unit is trimethylolpropane.
The term ring-opening polymerization refers to a form of addition polymerization, in which the terminal end of a polymer acts as a reactive center where further cyclic monomeric building blocks, i.e. the oxetane join to form a larger polymer chain through ionic propagation. When the reactive center of the propagating chain is a carbocation the polymerization is called cationic ring-opening polymerization and when the active center is a carbanion 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 acid. Suitable catalysts are e.g. Lewis acids such as AICI3, FeCI3, SnCI4, and BF3 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 hydrid. In all embodiments of the invention preferred catalysts are potassium hydride and/or potassium methylate.
An exemplary process for the preparation of a hyperbranched dendritic polyether backbone using 3-methyl-3-hydroxymethyl oxetane as starter as well as building block is illustrated below. In basic medium the primary hydroxyl groups of 3-methyl-3-hydroxymethyl oxetane are deprotonated thereby initiating an anionic ring-opening multibranching polymerization (ROMBP).
An exemplary process for the preparation of the hyperbranched dendritic polyether backbone using trimethylol propane as polyol starter unit and 3-methyl-3-hydroxymethyl oxetane as building block is depicted below:
Further information on the preparation of hyperbranched dendritic oxetane based polyether backbones suitable for the subsequent coupling of UV-filter substances are e.g. disclosed in WO0056802 or J. Polym. Sci. Part. A.: Polym. Chem., 36, 1685 (1998) which are enclosed herein by reference.
In all embodiments of the invention the hyperbranched dendritic polyether backbone comprises at least one oxetane building block with the preferences and definitions as given above per molecule. Preferably the hyperbranched dendritic polyether backbone comprises an average number of 2 to 600, more preferably of 2 to 250, most preferably of 3 to 100, in particular of 4 to 25 oxetane building blocks per molecule. In a particular preferred
embodiment the hyperbranched dendritic polyether backbone is obtainable by a ring- opening polymerization of only oxetane with the preferences and definitions as given above as building block and wherein either the oxetane itself acts as starter unit or a polyol starter unit is used. Preferably, a polyol starter unit with the definitions and preferences as given above is used.
Thus, in a specific embodiment the invention relates to a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of oxetane, optionally using a polyol starter unit. In a particular preferred embodiment the oxetane is 3-methyl-3-hydroxymethyl oxetane and/ or 3-ethyl-3-hydroxymethyl oxetane and the polyol starter unit is selected from pentaerythritol, dipentaerythritol and/ or trimethylolpropane, most preferably the oxetane is 3-methyl-3-hydroxymethyl and the polyol starter unit is trimethylolpropane. The hyperbranched dendritic polyether backbone is covalently bound to at least one, preferably to at least two, more preferably to at least three, most preferably to at least four, in particular to at least five UV absorbing chromophores. If desirable, all terminal hydroxyl groups of the hyperbranched dendritic polyether backbone can be functionalized with a UV absorbing chromophore. When more than one UV absorbing chromophore is present in the polymer according to the invention, the UV absorbing chromophores may be of a different or of the same type. Preferably, all UV absorbing chromophores are identical.
The UV absorbing chromophores covalently bound via an oxygen bridge to the hyperbranched dendritic polyether backbone comprise all groups which absorb light in the range of wavelengths 400 nm to 320 nm (UV-A) and 320 nm to 290 nm (UV-B) or of even shorter wavelengths (UV-C) and which are or can be used as chemical UV-filter substances. Preferably, the UV absorbing chromophores are derived from chromophores which are known UV-filter substances. Most preferably, the UV absorbing chromophores are derived from commercially available UV-filter substances as e.g. listed in the CTFA Cosmetic ingredient Handbook or "The Encyclopedia of Ultraviolet Filters" (ISBN: 978-1- 932633-25-2) by Nadim A. Shaath.
Suitable UV absorbing chromophores encompass derivatives of acrylates such as e.g. 2- cyano-3,3-diphenylacrylate, of p-aminobenzoates such as e.g. p-dimethylaminobenzoate, of
camphor such as e.g. 4-methyl benzylidene camphor, of cinnamates such as e.g. 4- methoxycinnamate, of benzophenones such as e.g. the 2,4-dihydroxybenzophenone or 4- amino-2 hydroxybenzophenone, of benzalmalonates, of 2-(4-ethoxy anilinomethylene)propanoates, of imidazole, of salicylates, of triazones, of triazols such as e.g. 2-hydroxyphenyl-benzotriazols, of dibenzoylmethanes such as e.g. of the t-butyl- dibenzoylmethane, of phenyl-benzimidazoles, of anthranilates, of phenyl-benzoxazoles, of 1 ,4-dihydropyranes and of others representing state of the art and known to those skilled in the art to be highly active.
In all embodiments of the invention, preferred groups of UV absorbing chromophores are groups derived from p-aminobenzoic acid such as e.g. p-dimethylaminobenzoic acid, amino substituted hydroxybenzophenones such as e.g. 2-[4-diethylaminobenzoyl]benzoic acid, cinnamic acid such as e.g. 4-methoxycinnamic acid, benzalmalonate such as e.g. [(4- hydroxyphenyl)methylene] propanedioate, in particular groups derived from p-aminobenzoic acid such as p-dimethylaminobenzoic acid. The at least one UV absorbing chromophore is covalently bound via an oxygen bridge to the hyperbranched dendritic polyether backbone. The oxygen atom of the oxygen bridge may either be derived from a hydroxyl group of the UV absorbing chromophore or from the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone. The linkage can be in the form of an ether-, an ester-, an urethane-, an amide-, a phenol ether- or a carbonate-group without being limited thereto. Preferably, the linkage is in the form of an ether-or an ester-group, most preferably the linkage is an ester group.
If the oxygen atom of the oxygen bridge is derived from the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone, the polymers according to the present invention may be prepared by reacting the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone with an UV absorbing chromophore as defined above having a functional group capable of reacting with the hydroxyl groups of the hyperbranched dendritic polyether backbone. Suitable functional groups include carboxyl-, ester-, acylhalogenide-, halogenide, anhydride, epoxide or isocyanate groups without being limited thereto.
The attachment can be performed by known method to a person skilled in the art, e.g. by reacting an acid chloride of a UV absorbing chromophore with the terminal hydroxyl groups of the hyperbranched dendritic polyether in the presence of a base such as pyridine. An
alternative method includes the transesterification of a UV-absorbing chromophore which is an ester such as e.g. an ester of p-aminobenzoate, an ester of 2-cyano-3,3- diphenylacrylate, an ester of 2-[4-(diethylamino)-2-hydroxybenzoyl]-benzoic acid or an ester of 2-methoxycinnamate with the terminal hydroxyl groups of the hyperbranched dendritic polyether. Suitable esters are for example the methyl or the ethyl esters, in particular the methyl esters.
If the oxygen atom of the oxygen bridge is derived from a hydroxyl group of the UV- absorbing chromophore, then the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone must be activated prior to the reaction. In this case the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are converted to leaving groups such as e.g. bromides, chlorides, mesylates, tosylates or triflates. The procedures to convert a hydroxyl group in a leaving group are known to one skilled in this art. For example, the terminal hydroxyl groups of the hyperbranched dendritic polyether may be reacted with mesylchloride in the presence of a tertiary amine or with SOCI2 in order to enhance the leaving group quality of the hydroxyl groups of the hyperbranched dendritic polyether backbone (activation). Afterwards, the activated hyperbranched dendritic polyether backbone is reacted e.g. with a deprotonated hydroxyl group of a suitable UV absorbing chromophore in a nudeophilic substitution reaction thereby forming an ether bond.
In all embodiments of the invention, preferably the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are reacted with an acid chloride or an ester of a UV absorbing chromophore. Most preferably in all embodiments of the invention the UV absorbing chromophore which is reacted with the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone is an ester of p-dimethylaminobenzoic acid such as in particular methyl p-dimethylaminobenzoate, ethyl p-dimethylaminobenzoate, methyl p-diethylaminobenzoate or ethyl p-diethylaminobenzoate most in particular methyl p- dimethylaminobenzoate or ethyl p-dimethylaminobenzoate. If not all terminal hydroxyl groups of the hyperbranched polyether backbone are reacted with a UV absorbing chromophore the residual hydroxyl groups may remain present in the polymer according to the invention. If desired, the residual hydroxyl groups can be reacted with suitable capping agents. Suitable capping agents include anhydrides or acid chlorides
or acid esters of Ci to C20 linear or branched alkanoic acids such as such as e.g. acetanhydride, acetylchloride, 2-ethyl hexanoic acid (m)ethyl ester or 2-ethyl hexanoic acid chloride. The skilled person is aware of further suitable capping agents which can be used to introduce the corresponding capping groups. In all embodiments of the invention preferably the residual hydroxyl groups of the hyperbranched dendritic polyether according to the invention are capped, preferably with acetanhydride, acetyl chloride and/ or 2-ethyl hexanoic acid chloride or ester, most preferably with 2-ethyl hexanoic acid chloride or ester.
In all embodiments of the invention preferably 30 - 100%, most preferably 70 - 90% of the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are linked to a UV absorbing chromophore and the residual terminal hydroxyl groups are linked to a capping group, in particular to a 2-ethyl hexanoyl-group.
Thus, in a particular embodiment, the invention relates to a polymer consisting of a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of oxetane, optionally and preferably in the presence of a polyol starter unit, in particular trimethylolpropane and wherein 30 - 100%, most preferably 70 - 90% of the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are linked to a UV absorbing chromophore and the residual terminal hydroxyl groups are linked to a capping group, in particular to a 2- ethyl hexanoyl-group. In a particular preferred embodiment, the oxetane is 3-methyl-3- hydroxymethyl oxetane, the polyol starter unit is trimethylolpropane, 70-90% of the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are linked to the same UV absorbing chromophore and the residual hydroxyl groups are linked to a 2-ethyl hexanoyl-group.
Preferably in all embodiments of the invention the polymer according to the invention has a number average molecular weight Mn within the range of from 500 to 50,000 g mol"1 , more preferably 750 to 25,000 g mol"1, most preferably 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 DI N 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 polymers according to the present invention are particularly useful as UV filters 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 polymers according to the 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. photoaging. Furthermore, the polymers according to the present invention are also suitable to protect natural or artificial hair color.
The polymers in accordance with the invention are colorless or light yellowish, liquid, crystalline or semi-liquid substances. They are distinguished by high photostability, good solubility in organic solvents, especially cosmetic solvents, and a short and economical synthetic route.
Due to their good lipophilicity the polymers of the invention can be incorporated well into oil- and/ or fat-containing topical compositions.
With respect to the lipophilicity the polymers of the invention in accordance with the invention are superior to comparable glycidol based UV-filter substances referred to earlier as the polymers of the invention fulfill the criteria which are required in the present instance, namely a high solubility in cosmetic solvents such as e.g. C12-15 alkyl benzoate (e.g., FINSOLV TN [Finetex Inc.]), isopropyl myristate (e.g., DELTYL EXTRA, [Givaudan Roure Vernier, Switzerland]), PPG 15-stearyl ether (e.g., ARLAMOL E, [ICI Surfactants Everberg 1 Belgium]), cocoyl capylate/caprate (e.g., CETIOL LC, [sold by Henkel KGaA, Dusseldorf Germany]) or diisopropyl adipate (e.g., CRODAMOL DA, [Croda Universal Ltd., North Humberside, England]) which is further illustrated in the examples.
The polymers according to the invention are therefore suitable for the incorporation as UV- filter substances in topical compositions such as in cosmetic, pharmaceutical and veterinary
medical preparations. The polymers can be used both in dissolved form and in the micronized state.
Thus, the present invention also relates to compositions, preferably to topical compositions comprising a polymer according to the invention and a cosmetically acceptable carrier.
The amount of the polymer according to the invention 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 are incorporated.
The term "topical composition" as used herein refers in particular to a cosmetic composition that can be topically applied to mammalian keratinous tissue, particularly human skin and hair.
The term "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), 4th edition, 1992. Preferably, the topical compositions according to the present invention are 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 C7W- or W/O-type), PIT-emulsion, multiple emulsion (e. g. C7W/0- 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. If the topical composition is or comprises an emulsion it can also contain one or more anionic, nonionic, cationic or amphoteric surfactant(s).
Preferred topical compositions according to the invention are skin care preparations, decorative preparations, light protection preparations and functional preparations.
Examples of skin care preparations are, in particular, body oils, body lotions, body gels, treatment creams, skin protection ointments, shaving preparations, such as shaving foams
or gels, skin powders such as baby powder, moisturizing gels, moisturizing sprays, revitalizing body sprays, cellulite gels, face and/or body moisturizers, facial and/or body cleansers, face masks, anti acne preparations and/or peeling preparations.
Examples of decorative preparations are, in particular, lipsticks, eye shadows, mascaras, dry and moist make-up formulations, rouges, powders, and/or suntan lotions.
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.
Topical compositions in accordance with the invention can be in the form of a liquid, lotion, a thickened lotion, a gel, a cream, a milk, an ointment, a paste, a powder, a make-up, or a solid tube stick and can be optionally be packaged as an aerosol and can be provided in the form of a mousse such as a aerosol mousse, a foam or a spray foam, a spray, a stick, a plaster, a cleanser, a soap or a wipe.
In accordance with the present invention, the topical composition contains at least one polymer according to the invention, optionally in combination with further ingredients such as ingredients for skin lightening; tanning prevention; treatment of hyperpigmentation; preventing or reducing acne, wrinkles, lines, atrophy and/or inflammation; as well as topical anesthetics; antimicrobial and/or antifungal agents; chelators and/or sequestrants; anti- cellulites agents (e.g. phytanic acid) and/or further UV-filter substances and carriers and/or excipients or diluents conventionally used in topical compositions. If nothing else is stated, the excipients, additives, diluents, etc. mentioned in the following are suitable for topical compositions according to the present invention. The necessary amounts of the cosmetic and dermatological adjuvants and additives can, based on the desired product, easily be determined by the skilled person.
The cosmetically active ingredients useful herein can in some instances provide more than one benefit or operate via more than one mode of action.
Examples of cosmetically active ingredients to be used in the topical composition according to the invention comprise peptides (e.g., Matrixyl™ [pentapeptide derivative]), oligopeptides,
wax-based synthetic peptides (e.g., octyl palmitate and tribehenin and sorbitan isostearate and palmitoyl-oligopeptide), iodopropyl butylcarbamate, glycerol, urea, guanidine (e.g. amino guanidine); vitamins and derivatives thereof such as vitamin C (ascorbic acid), vitamin A (e.g., retinoid derivatives such as retinyl palmitate or retinyl propionate), vitamin E (e.g., tocopherol acetate), vitamin B3 (e.g. niacinamide) and vitamin B5 (e.g. panthenol), vitamin B6 and vitamin B12, 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, conjugated fatty acids, carnitin, carnosine, biochinonen, phytofluen, phytoen, and their corresponding derivatives, co-enzyme Q10/ubiquinone), anti-oxidants [preferably (-)-epigallocatechin galate (EGCG), hydroxytyrosol, and/or olive extract without being limited thereto. Preferred examples of cosmetically active ingredients are vitamin C (ascorbic acid) and/or its derivatives (e.g. ascorbyl phosphate such as Stay C (sodium ascorbyl monophosphate) from DSM Nutritional Products Ltd.), 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 B6, vitamin B12, biotin, co-enzyme Q10, EGCG, hydroxytyrosol and/or olive extract.
The topical cosmetic 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, sunscreens, antifoaming agents, moisturizers, 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, antifoaming agents, pigments or nanopigments,
e.g. those suited for providing a photoprotective effect by physically blocking out ultraviolet radiation, or any other ingredients usually formulated into cosmetic compositions. 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 dermatological adjuvants and additives can - based on the desired product - 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.
Which amount of the topical composition has to be applied, depends on the concentration of the active ingredient(s) in the product and the desired cosmetic effect(s). 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 cm2 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).
By "'leave-on' 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.
Of special importance as cosmetic compositions for the skin are light-protective preparations, such as sun milks, lotions, creams, oils, sunblocks or tropicals, pretanning preparations or after-sun preparations, also skin-tanning preparations (i.e. compositions for the artificial/sunless tanning and/or browning of human skin), for example self-tanning creams. Of particular interest are sun protection creams, sun protection lotions, sun protection milk and sun protection preparations in the form of a spray.
Of special importance as cosmetic compositions for the hair are preparations for hair treatment, especially hair-washing preparations in the form of shampoos, hair conditioners, hair-care preparations, e.g. pretreatment preparations, hair tonics, styling creams, styling gels, pomades, hair rinses, treatment packs, intensive hair treatments, hair- straightening preparations, liquid hair-setting preparations, hair foams and hairsprays. Of special interest are hair-washing preparations in the form of shampoos.
A shampoo may, for example, have the following composition: from 0.01 to 5 % by weight of a polymer according to the 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 fatty substances can be an oil or a wax, or mixture thereof. By the term "oil" is intended a compound which is liquid at ambient temperature. By the term "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. degree. C.
Exemplary 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.sub.12 -C.sub.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.
Exemplary waxy compounds are paraffin wax, carnauba wax, beeswax or hydrogenated castor oil.
And exemplary organic solvents include the lower alcohols and polyols having at most 8 carbon atoms.
The thickeners are advantageously selected, in particular, from among the crosslinked polyacrylic acids or modified or unmodified guar gums and celluloses, such as hydroxypropylated guar gum, methylhydroxyethylcellulose and hydroxypropylmethylcellulose.
Where convenient, other conventional UV-A and/or UV-B and/ or broad spectrum UV-filter substances may be added into the topical compositions of the invention. The combination of
UV-filter substances may show a synergistic effect. These additional UV-filter substances are advantageously selected from among the compounds listed below without being limited thereto:
Examples of UV-B or broad spectrum filter substances, i.e. substances having absorption maximums between about 290 nm and 340 nm may be organic or inorganic compounds. Organic UV-B or broadband screening agents are e.g. 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® MCX), ethoxyethyl methoxycinnamate, diethanolamine methoxycinnamate (PARSOL® Hydro), isoamyl methoxycinnamate and the like as well as cinnamic acid derivatives bond to siloxanes; p- aminobenzoic acid derivatives, such as p-aminobenzoic acid, 2-ethylhexyl p- dimethylaminobenzoate, N-oxypropylenated ethyl p-aminobenzoate, glyceryl p- aminobenzoate; benzophenones such as benzophenone-3, benzophenone-4, 2, 2', 4,4'- tetrahydroxy-benzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone and the like; esters of benzalmalonic acid such as di-(2-ethylhexyl) 4-methoxybenzalmalonate; esters of 2-(4-ethoxy-anilinomethylene)propandioic acid such as 2-(4-ethoxy anilinomethylene) propandioic acid diethyl ester as described in the European Patent Publication EP 0895 776; organosiloxane compounds containing benzmalonate groups as described in the European Patent Publications EP 0358584 B1 , EP 0538431 B1 and EP 0709080 A1 such as PARSOL® SLX; drometrizole trisiloxane (Mexoryl XL); imidazole derivatives such as e.g. 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, diethanolamine salts and the like; 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 (Uvasorb HEB) and the like.
Encapsulated UV-filters such as encapsulated ethylhexyl methoxycinnamate (Eusolex UV- pearls) or microcapsules loaded with UV-filters as e.g. dislosed in EP 1471995 and the like; Examples of broad spectrum or UV A screening agents i.e. substances having absorption maximums between about 320 nm and 400 nm may be organic or inorganic compounds 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; bis-ethylhexyloxyphenol methoxyphenyl triazine (Tinosorb S) 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) (Neoheliopan AP); amino substituted hydroxybenzophenones such as 2-(4-Diethylamino-2-hydroxy-benzoyl)- benzoic acid hexylester (Uvinul A plus) as described in the European Patent Publication EP 1046391 ; Ionic UV-A filters as described in the International Patent Publication WO2005080341 A1 ; Pigments such as microparticulated ZnO and the like. The term "microparticulated" refers to a particle size from about 5 nm to about 200 nm, particularly from about 15 nm to about 100 nm. The particles 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.
As dibenzoylmethane derivatives have limited photostability it may be desirable to photostabilize these UV-A screening agents. Thus, the term "conventional UV-A screening agent" also refers to dibenzoylmethane derivatives such as e.g. PARSOL® 1789 stabilized by, e.g. 3,3-Diphenylacrylate derivatives as described in the European Patent Publications EP 0 514 491 B1 and EP 0 780 1 19 A1 ; Benzylidene camphor derivatives as described in the US Patent No. 5,605,680; Organosiloxanes containing benzmalonate groups as described in the European Patent Publications EP 0358584 B1 , EP 0538431 B1 and EP 0709080 A1.
The UV-filter substances are generally present in the compositions according to the invention in proportions ranging from 0.1 to 20 wt.-%, preferably ranging from 0.2 to 15 wt- %, most preferably ranging from 0.5 to 10 wt.-% with respect to the total weigh of the composition.
Of course, one skilled in this art will take care to select the above mentioned optional additional compound or compounds and/or their amounts such that the advantageous
properties intrinsically associated with the combination in accordance with the invention are not, or not substantially, detrimentally affected by the envisaged addition or additions.
The compositions according to the invention are preferably formulated an oil-in-water or water-in-oil emulsion.
The cosmetic and/ or dermatological compositions according to the invention have a pH in the range of 3-10, preferably in the range of pH of 4-8, most preferred in the range of pH 4- 6.
The following examples are provided to further illustrate the compounds and compositions of the present invention. These examples are illustrative only and are not intended to limit the scope of the invention in any way.
Example 1
1. Preparation of the hyperbranched dendritic polyether Polv-(methyl-3-oxetanmethanol)
A mixture of 1 , 1 , 1 -trimethylolpropane (5.4g, 40 mmol) and a 3.7 M potassium methylate solution in methanol (3.5 ml.) was heated to 60°C and methanol was removed under vacuum. The temperature was raised to 95°C and residual methanol was removed under high vacuum. 3-methyl-3-oxetanmethanol (36.8 g, 360 mmol) was added drop wise (0.05 mL/min). The reaction mixture was stirred at 150°C for 24h and at 185°C for another 24h. The reaction process was continuously followed by GPC analysis (Rl detection). After cooling to room temperature the resulting polymer was solved in methanol (200 ml.) and neutralized by ion exchange chromatography (Amberlite CG-120, H+ form). Evaporation under vacuum afforded 33 g poly-(methyl-3-oxetanmethanol) as highly viscous oil. Characterization of the product by GPC and 1H NMR revealed the complete consumption of monomers.
. Attachment of p-dimethylamino benzoyl-qroups to Polv-(methyl-3-oxetanmethanol).
To a solution of poly-(methyl-3-oxetanmethanol) (2.0 g, 22.8 mmol OH) in pyridine (30 mL) was added p-dimethylamino benzoic acid chloride (2.9 g, 16.0 mmol, 70% loading) and the reaction mixture was stirred at 1 15°C for 12h. The reaction mixture was cooled to 80°C and 2-ethyl hexanoic acid chloride (2.2 g, 13.7 mmol) was added. The reaction mixture was stirred at 1 15°C for 4h and evaporated to dryness. The residue was dissolved in ethyl acetate (100 mL) and extracted with an aqueous potassium carbonate solution (10%, 2 x 75 mL), with an aqueous citric acid solution (5%, 75 mL), and brine (50 mL). The organic layer was dried over sodium sulfate, filtered, and evaporated to dryness. After removal of residual solvents at 80°C under high vacuum for 12h 5.1 g product was obtained as a glassy solid polymeric UVB filter, which could be ground to powder.
The polymeric filter showed an E^-value of 812 in THF at 308 nm. The solubility in Finsolv TN (C-12-15 alkyl benzoate) was determined to be at least 25% (w/w). The Mn has been determined by GPC using polystyrene standards to be 1700 g/mol.
Comparative example:
Preparation of a polymeric UV-filter by attaching p-dimethylamino benzoic acid to Polyqlycerol.
Polyglycerol was prepared according to Sunder, A.; Mijlhaupt, R.; Frey, H. Macromolecules, 2000, 33, 309-314.
To a solution of polyglycerol (2.3 g, 33.8 mmol OH) in pyridine (30 mL) was added p- dimethylamino benzoic acid chloride (4.3 g, 23.7 mmol, 70% loading) and the reaction mixture was stirred at 1 15°C for 12h. The reaction mixture was cooled to 80°C and 2-ethyl hexanoic acid chloride (3.3 g, 20.3 mmol) was added. The reaction mixture was stirred at 1 15°C for 6h. After cooling to room temperature water was added (50 mL) and the mixture was stirred at 25°C for 12h and evaporated to dryness. The residue was dissolved in toluene (100 mL) and extracted with an aqueous potassium carbonate solution (10%, 2 x 50 mL), with an aqueous citric acid solution (5%, 50 mL), and brine (20 mL). The organic layer was dried over sodium sulfate, filtered, and evaporated to dryness. After removal of residual solvents at 80°C under high vacuum for 12h 6.5 g product was obtained as a highly viscous polymeric UVB filter.
The polymeric filter showed an E^-value of 805 in THF at 310 nm. The product showed a solubility of less than 5wt.-% in Finsolv TN at 50°C. The Mn has been determined by GPC using polystyrene standards to be 1670 g/mol.
The solubility was measured by adding to a mixture of 50 mg of the polymeric UV filter and 150 mg of Finsolv TN in 5 minutes intervals subsequently additional 100 mg portions of Finsolv TN at 50°C until the polymer has been completely dissolved. After each solvent addition the sample was cooled to room temperature and the solubility was checked. The solution remains clear and transparent when the polymer is completely solved. Insoluble polymers result in a cloudy liquid, which separates on standing in a polymer and a solvent phase.
Results:
As can be seen from the table, the compound according to the invention shows a higher solubility at equal chromophore loading and molecular weight compared to the respective glycidol based UV-filter substance.
Example 2:
The in vitro SPF (Sun Protection Factor) of the following topical composition was determined according to the COLIPA protocol as described in the Guideline "Method for the in vitro determination of UVA protection provided by sunscreen products" to give an in vitro SPF of 8.
Compound name INCI name %
Estol 3650 Glyceryl Myristate 2.0
Butylated Hydroxytoluene BHT 0.05
Brij 72 Steareth-2 2.0
Brij 721 Steareth-21 2.0
Lanette O Cetearyl Alcohol 2.0
Finsolv TN C12-15 Alkyl Benzoate 18.0
Phenonip Phenoxyethanol & Methylparabene 0.8
PABA-Polyoxetane Example 1 8.0
EDTA BD Disodium EDTA 0.1
Glycerin Glycerin 4.0
Potassium Hydroxide 10% Potassium Hydroxide 0.12
Water Aqua 59.93
Polyacrylamide & C13-14
Sepigel 305 1.0
Isoparabene
Claims
Patent claims:
A polymer comprising a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of at least one oxetane.
A polymer as in claim 1 , characterized in that the oxetane is a compound of the general formula (I)
(I)
wherein
R1 represents H, a Ci to C4 alkyl group, an aryl group or an arylalkyl group and
R2 represents a Ci to C4 alkylene group.
3. A polymer as in claim 1 , wherein the oxetane is 3-methyl-3-hydroxymethyl oxetane.
4. A polymer as in anyone of claims 1 to 3, wherein a polyol starter unit is present.
5. A polymer as in claim 4, wherein the polyol starter unit is trimethylolpropane. 6. A polymer as in anyone of claims 1 to 5, wherein the UV absorbing chromophore is a p- aminobenzoyl-, amino substituted hydroxybenzophenone-, cinnamoyl- and/ or a benzalmalonate group.
7. A polymer as in anyone of claims 1 to 6 wherein the UV absorbing chromophore is a p-dimethylaminobenzoyl-group.
8. A polymer as in anyone of claims 1 to 7, wherein 70 - 90% of the terminal hydroxyl groups of the hyperbranched dendritic polyether backbone are linked to a UV absorbing chromophore and the residual terminal hydroxyl groups are linked to a capping group.
9. A polymer as in claim 8, wherein the capping group is a 2-ethyl hexanoyl-group.
10. A topical composition comprising a polymer as in anyone of claims 1 to 9 and cosmetically acceptable carrier.
1 1 . Use of a polymer as in anyone of claims 1 to 9 as UV-filter substance.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010800563887A CN102656208A (en) | 2009-12-09 | 2010-12-08 | UV absorbing dentritic polyether prepared by polymerization of oxetanes |
EP10787768A EP2510041A1 (en) | 2009-12-09 | 2010-12-08 | Uv absorbing dentritic polyether prepared by polymerization of oxetanes |
US13/505,832 US20120282200A1 (en) | 2009-12-09 | 2010-12-08 | Uv absorbing dentritic polyether prepared by polymerization of oxetanes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09178478.5 | 2009-12-09 | ||
EP09178478 | 2009-12-09 |
Publications (1)
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WO2011070050A1 true WO2011070050A1 (en) | 2011-06-16 |
Family
ID=43432428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/069132 WO2011070050A1 (en) | 2009-12-09 | 2010-12-08 | Uv absorbing dentritic polyether prepared by polymerization of oxetanes |
Country Status (4)
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US (1) | US20120282200A1 (en) |
EP (1) | EP2510041A1 (en) |
CN (1) | CN102656208A (en) |
WO (1) | WO2011070050A1 (en) |
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WO2014004477A3 (en) * | 2012-06-28 | 2014-11-27 | Johnson & Johnson Consumer Companies, Inc. | Sunscreen compositions containing an ultraviolet radiation-absorbing polymer |
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US9469725B2 (en) | 2012-06-28 | 2016-10-18 | Johnson & Johnson Consumer Inc. | Ultraviolet radiation absorbing polymers |
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EP3290021A1 (en) * | 2016-09-02 | 2018-03-07 | Unilever N.V. | Compostion for topical application comprising a photochromic agent |
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US10874603B2 (en) | 2014-05-12 | 2020-12-29 | Johnson & Johnson Consumer Inc. | Sunscreen compositions containing a UV-absorbing polyglycerol and a non-UV-absorbing polyglycerol |
EP3290021A1 (en) * | 2016-09-02 | 2018-03-07 | Unilever N.V. | Compostion for topical application comprising a photochromic agent |
US10596087B2 (en) | 2016-10-05 | 2020-03-24 | Johnson & Johnson Consumer Inc. | Ultraviolet radiation absorbing polymer composition |
US10874597B2 (en) | 2016-10-05 | 2020-12-29 | Johnson & Johnson Consumer Inc. | Ultraviolet radiation absorbing polymer composition |
CN112358624A (en) * | 2020-11-09 | 2021-02-12 | 中国科学院化学研究所 | Polymer electrolyte capable of working in wide temperature range and preparation method thereof |
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CN102656208A (en) | 2012-09-05 |
EP2510041A1 (en) | 2012-10-17 |
US20120282200A1 (en) | 2012-11-08 |
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