SUNCARE COMPOSITIONS AND METHODS

Abstract

The disclosure relates to compositions and methods for providing UV protection to the skin which are capable of also improving the appearance of the skin. Compositions comprise at least one thermoplastic elastomer, at least one adhesive polymer, at least one filler, and at least one UV protection agent. Methods comprise applying the compositions to the skin to tighten the skin or hide skin imperfections, while providing UV protection, by forming a film on the skin.

Claims

1.-63. (canceled)

64. A suncare composition comprising: a. at least one thermoplastic elastomer; b. at least one adhesive polymer; c. at least one filler; and d. at least one UV protection agent, wherein the at least one thermoplastic elastomer has at least two glass transition temperatures (T.sub.g).

65. The suncare composition of claim 64, wherein the at least one thermoplastic elastomer has a first T.sub.g below about 0 C., and a second T.sub.g greater than about 25 C.

66. The suncare composition of claim 64, wherein the at least one thermoplastic elastomer is chosen from diblock, triblock, multiblock, radial, and star copolymers.

67. The suncare composition of claim 64, wherein the at least one thermoplastic elastomer comprises at least one styrene block and at least one block comprising units selected from butadiene, ethylene, propylene, butylene, isoprene, or mixtures thereof.

68. The suncare composition of claim 64, wherein the at least one thermoplastic elastomer is chosen from: diblock copolymers chosen from styrene-ethylene/propylene copolymers, styrene-ethylene/butadiene copolymers, styrene-ethylene/butylene copolymers, styrene-butadiene, or styrene-isoprene copolymers; triblock copolymers chosen from styrene-ethylene/propylene-styrene copolymers, styrene-ethylene/butadiene-styrene copolymers, copolymers of styrene-isoprene-styrene, or copolymers of styrene-butadiene-styrene; and mixtures thereof.

69. The suncare composition of claim 64, wherein the at least one thermoplastic elastomer has a first T.sub.g greater than about 40 C., and a second T.sub.g less than about 50 C.

70. The suncare composition of claim 64, wherein the at least one thermoplastic elastomer is chosen from semicrystalline block copolymers.

71. The skin tightening film of claim 70, wherein the semicrystalline block copolymers comprise at least one moiety corresponding to formula (I) and/or at least one moiety corresponding to formula (II): ##STR00004## wherein: 1) R.sup.1, R.sup.2, R.sup.3 and R.sup.4, which may be identical or different, represent a group chosen from: (a) linear, branched or cyclic, saturated or unsaturated, C.sub.1 to C.sub.40 hydrocarbon-based groups, possibly containing in their chain one or more oxygen, sulphur and/or nitrogen atoms, and possibly being partially or totally substituted with fluorine atoms, (b) C.sub.6 to C.sub.10 aryl groups, optionally substituted with one or more C.sub.1 to C.sub.4 alkyl groups, (c) polyorganosiloxane chains possibly containing one or more oxygen, sulphur and/or nitrogen atoms; 2) X, which may be identical or different, represents a linear or branched C.sub.1 to C.sub.30 alkylenediyl group, possibly containing in its chain one or more oxygen and/or nitrogen atoms; 3) Y is a saturated or unsaturated, C.sub.1 to C.sub.50 linear or branched divalent alkylene, arylene, cycloalkylene, alkylarylene or arylalkylene group, optionally comprising one or more oxygen, sulphur and/or nitrogen atoms, and/or optionally substituted with one of the following atoms or groups of atoms: fluorine, hydroxyl, C.sub.3 to C.sub.8 cycloalkyl, C.sub.1 to C.sub.40 alkyl, C.sub.5 to C.sub.10 aryl, phenyl optionally substituted with one to three C.sub.1 to C.sub.3 alkyl, C.sub.1 to C.sub.3 hydroxyalkyl, and C.sub.1 to C.sub.6 aminoalkyl groups; 4) G, which may be identical or different, represents a group chosen from ester, amide, sulphonamide, carbamate, thiocarbamate, urea, thiourea groups, and combinations thereof; 5) m is an integer ranging from 1 to 1,000; and 6) n is an integer ranging from 2 to 500; ##STR00005## wherein: R.sup.1 and R, which may be identical or different, are as defined above for formula R.sup.7 represents a group as defined above for R.sup.1 and R.sup.3, or represents a group of formula X-G-R.sup.9 in which X and G are as defined above for formula (I) and R.sup.9 represents a hydrogen atom or a linear, branched or cyclic, saturated or unsaturated, C.sub.1 to C.sub.50 hydrocarbon-based group optionally comprising in its chain one or more atoms chosen from O, S and N, optionally substituted with one or more fluorine atoms and/or one or more hydroxyl groups, or a phenyl group optionally substituted with one or more C.sub.1 to C.sub.4 alkyl groups, R.sup.8 represents a group of formula X-G-R.sup.9 in which X, G and R.sup.9 are as defined above, m.sub.1 is an integer ranging from 1 to 998, and m.sub.2 is an integer ranging from 2 to 500.

72. The skin tightening film of claim 70, wherein the semicrystalline block copolymers comprise at least one moiety corresponding to formula (III) and/or at least one moiety corresponding to formula (IV): ##STR00006## wherein: (a) R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are the same or different and may be selected from the group consisting of methyl, ethyl, propyl, isopropyl, a siloxane chain, and phenyl; (b) X is a linear or branched chain alkylene having 1-30 carbons; (c) Y is selected from the group consisting of linear or branched chain alkylenes having 1-40 carbons; (d) m is a number between 1 and 700; and (e) n is a number between 1 and 500.

73. The suncare composition of claim 64, wherein the at least one thermoplastic elastomer is present in the composition in an amount ranging from about 5% to about 25% by weight, relative to the total weight of the composition.

74. The suncare composition of claim 64, wherein the at least one adhesive polymer has a T.sub.g greater than about 25 C.

75. The suncare composition of claim 64, wherein the at least one adhesive film-forming polymer is chosen from polymer particles of C.sub.1-C.sub.4 alkyl(methacrylate)polymer, stabilized in a non-aqueous dispersion.

76. The suncare composition of claim 64, wherein the at least one adhesive polymer is chosen from polymer particles comprising about 80% to about 100%, by weight, of C.sub.1-C.sub.4 alkyl (meth)acrylate and of about 0% to about 20%, by weight, of ethylenically unsaturated acid monomer of C.sub.1-C.sub.4 alkyl(methacrylate) polymer in an oil dispersion.

77. The suncare composition of claim 76, wherein the polymer of the particles is chosen from: polymers consisting of at least one C.sub.1-C.sub.4 alkyl(methacrylate)polymer; and polymers consisting essentially of a copolymer of C.sub.1-C.sub.4 (meth)acrylate and of (meth)acrylic acid or maleic anhydride.

78. The suncare composition of claim 76, wherein the C.sub.1-C.sub.4 alkyl(methacrylate)polymer is chosen from methyl(meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, and tert-butyl (meth)acrylate polymers.

79. The suncare composition of claim 76, wherein the polymer particles are stabilized in the oil dispersion by at least one stabilizer chosen from isobornyl acrylate homopolymers, statistical copolymers of isobornyl acrylate/methyl acrylate, statistical copolymers of isobornyl acrylate/methyl acrylate/ethyl acrylate, and statistical copolymers of isobornyl methacrylate/methyl acrylate.

80. The suncare composition of claim 64, wherein the at least one adhesive polymer is chosen from aliphatic or cycloaliphatic hydrocarbon polymers selected from aliphatic or cycloaliphatic hydrocarbon resins.

81. The suncare composition of claim 64, wherein the at least one adhesive polymer is chosen from aliphatic hydrocarbon resins, aromatic modified aliphatic hydrocarbon resins, hydrogenated polycyclopentadiene resins, polycyclopentadiene resins, gum resins, gum resin esters, wood resins, wood resin esters, tall oil resins, tall oil resin esters, polyterpenes, aromatic modified polyterpenes, terpene phenolics, aromatic modified hydrogenated polycyclopentadiene resins, hydrogenated aliphatic resin, hydrogenated aliphatic aromatic resins, hydrogenated terpenes and modified terpenes, hydrogenated rosin acids, hydrogenated rosin esters, polyisoprene, partially or fully hydrogenated polyisoprene, polybutenediene, partially or fully hydrogenated polybutenediene, and hydrogenated styrene/methyl styrene/indene copolymers.

82. The suncare composition of claim 64, wherein the adhesive polymer has a T.sub.g less than about 25 C.

83. The suncare composition of claim 84, wherein the at least one adhesive polymer is chosen from hyperbranched polyacids, said hyperbranched polyacids comprising at least two carboxyl groups.

84. The suncare composition of claim 83, wherein the hyperbranched polyacids have a molecular weight (Mw) ranging from about 500 to about 25,000, a viscosity at 210 F. ranging from 0.01 Pas to 10 Pas, and/or an acid number ranging from about 20 to about 400 mg/KOH.

85. The suncare composition of claim 83, wherein the hyperbranched polyacids are chosen from C.sub.30+ olefin/undecylenic acid copolymers.

86. The suncare composition of claim 64, wherein the at least one adhesive polymer is chosen from acrylic type film formers.

87. The suncare composition of claim 64, wherein the at least one adhesive polymer is chosen from copolymers containing at least one apolar monomer, at least one olefinically unsaturated monomer, and at least one vinylically functionalized monomer.

88. The suncare composition of claim 64, wherein the at least one adhesive polymer is present in the composition in an amount ranging from about 5% to about 25% by weight, relative to the total weight of the composition.

89. The suncare composition of claim 64, wherein the at least one filler is chosen from fillers having a particle size greater than about 100 nm, and/or a specific surface area greater than about 200 m.sup.2/g.

90. The suncare composition of claim 64, wherein the at least one filler is chosen from silica particles, hydrophobic silica aerogel particles, or aerogel particles of hydrophobic silica surface-modified with trimethylsilyl groups.

91. The suncare composition of claim 64, wherein the at least one filler is present in the composition in an amount ranging from about 0.1% to about 20% by weight, relative to the weight of the composition.

92. The suncare composition of claim 64, wherein the at least one UV protection agent is chosen from organic and inorganic sunfilters.

93. The suncare composition of claim 64, further comprising at least one additional component chosen from solvents, silicone elastomers, humectants, water, and colorants.

94. The suncare composition of claim 64, wherein the at least one thermoplastic elastomer, at least one adhesive polymer, and at least one filler are present in a combined amount of greater than about 10% by weight, relative to the weight of the composition.

95. The suncare composition of claim 64, wherein the ratio of the at least one thermoplastic elastomer to the at least one adhesive polymer is in the range of about 1:10 to 10:1.

96. The suncare composition of claim 64, wherein the composition has a consistency G* of greater than about 100 Pa (at 10% strain) and a phase angle below about 45.

97. A method for protecting the skin from UV rays, said method comprising forming a film on the skin by applying a composition comprising: a. at least one thermoplastic elastomer; b. at least one adhesive polymer; c. at least one filler; and d. at least one UV protection agent, wherein the at least one thermoplastic elastomer has at least two glass transition temperatures (T.sub.g), and wherein the film has a Young Modulus of greater than about 500 kPa.

Description

EXAMPLE

[0160] The following Example is provided for illustrative purposes only, and is not intended to be limiting.

[0161] In the following example, the amounts of components given are in terms of active material (AM).

Dynamic Mechanical Analysis (DMA)

[0162] The determination of Young Modulus of the films for all Examples was as follows. The film was made by using a draw down bar at 8 to cast the solution on a Teflon plate and dried the film at 40 C. in an oven overnight. The DMA Q800FR from TA instruments was used to measure the stress-strain response of the dried film. The deformation was applied from 0% strain to 200% strain at a rate of 100% strain/min at 32 C. Then the Young Modulus of the film was determined from the slope of the stress-strain curve in the linear viscoelastic regime.

Haze and Transparency-BYK Haze-Guard

[0163] The film was made by using a draw down bar at 8 to cast the solution on a transparent plastic film and dried on bench for 3 hours. The BYK Haze-Guard instrument was used to measure the transparency and the haze of the film.

In-Vitro SPF

[0164] Samples are tested for in-vitro SPF properties on the LABSPHERE UV2000S. The formulations were pulled with a draw-down bar 37 micron.

Example 1

Evaluation of Sunfilters in Films

[0165] A thermoplastic elastomer, Kraton (25%), was dispersed in isoparaffin oil with a mechanical stirrer and heated to 90 C. Stirring continued at 90 C. for 1-2 hours until all Kraton polymer was dissolved and the polymer solution became clear. The desired amounts of oil dispersion (49% in isododecane), silica silylate, and UV protection agents were added into the Kraton/isoparaffin oil solution at the specified ratios in a plastic container, and the solution was mixed with a high speed mixer at 2500 rpm/min for 5 minutes. The final solution was kept at room temperature and sealed to avoid the evaporation of solvents.

[0166] The following Table 1 shows the comparison of the film formed from a composition prepared according to the disclosure with UV protection agents (Ex. 1a, organic; Ex. 1b, inorganic), and comparative compositions (Ex. 1C-1; Ex. 1C-2; Ex. 1C-3).

TABLE-US-00001 TABLE 1 Addition of sunfilters to film compositions Organic sunfilter Inorganic sunfilter Ex. 1a Ex. 1C-1 Ex. 1C-2 Ex. 1b Ex. 1C-3 HYDROGENATED .sup.11% 11% .sup.11% 11% STYRENE/BUTADIENE COPOLYMER C28-52 5.50% 5.50%.sup. 2.80% 2.80%.sup. OLEFIN/UNDECYLENIC ACID COPOLYMER (Polyacid) ISODODECANE (AND) DIMETHICONE CROSSPOLYMER SILICA SILYLATE 3% 3% 3% 3% C8-9 ISOPARAFFIN .sup.33% 33% .sup.33% 33% ISODODECANE 44.50% 47.50% 49.30% 50.30% BUTYL 1.00% 1% 1.00% METHOXYDIBENZOYLMETH- ANE OCTOCRYLENE 2.00% 2% 2.00% TITANIUM DIOXIDE 0.83 1 (and) ALUMINUM HYDROXIDE 0.9 (and) STEARIC ACID 0.8 Silicone resin (DC670) 5% Isododecane Qs Total percentage 100% 100% 100% 100% 100% Aspect Transparent Transparent, Transparent Translucent Transparent soft focus soft focus soft focus Soft focus SPF 54.31 0 2 330 0

[0167] The films were evaluated as set out above. From the results, it is seen that the addition of sunfilters in low amounts provides good UV protection.