Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/89—Polysiloxanes
  • A61K8/891—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q19/00—Preparations for care of the skin
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/58—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing atoms other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur or phosphorus
  • A61K8/585—Organosilicon compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/89—Polysiloxanes
  • A61K8/895—Polysiloxanes containing silicon bound to unsaturated aliphatic groups, e.g. vinyl dimethicone
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
  • A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/04—Polysiloxanes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/14—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/59—Mixtures
• • 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
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/80—Siloxanes having aromatic substituents, e.g. phenyl side groups

Definitions

• the invention concerns a personal care composition, especially a personal care composition comprising silicone elastomer that has improved stability and good sensorial property.
• Silicone elastomers are extensively used in personal care products to provide desired sensorial properties.
• Silicone elastomer as used herein, means cross-linked particles of a silicone polymer that swells significantly in a solvent forming a space filling material which behaves as a visco-elastic soft solid.
• the silicone elastomers are used in a blend of silicone elastomer and solvent, which is a dispersion of the silicone elastomer in the solvent.
• Most conventional silicone elastomers are siloxanes containing neither hydrophilic nor hydrophobic part, which leads to poor compatibility with many organic oils including organic sunscreen agents.
• the present inventors have now found unexpectedly that functional silicone elastomers, which are silicone elastomers modified by grafting hydrophobic and/or hydrophilic groups onto the backbones of elastomers, present better structure benefit than conventional silicone elastomers.
• the functional silicone elastomers used in this invention are alkyl modified, phenyl modified and/or dual (alkyl and phenyl) modified silicone elastomers.
• the dual (alkyl and phenyl) modified silicone elastomer shows the best structuring benefit, providing a personal care composition with enhanced stability and desired sensorial property.
• Solar radiation includes ultraviolet (UV) radiation.
• Important ultraviolet wavelength regions are UV-A region from 320 to 400 nm and UV-B region from 290 to 320 nm.
• UV-B radiation is high energy emission that can cause significant damage to living tissues and cells, especially it is responsible for sunburn, melanoma and formation of wrinkles with prolonged and cumulative exposure.
• UV-A radiation also causes skin damage. UV-A radiation penetrates deeper into the skin than what is known earlier that can cause damage to the elastin fibers located deeper in the skin and thus hasten skin aging. Therefore, it is desirable for people to protect their skin from harmful UV- A and UV-B radiation.
• both UV-A and UV-B sunscreens are included in sunscreen compositions to provide protection over a broad range of UV radiation.
• sunscreen compositions having high sun protection factor (SPF) and UV-A protection factor (UVAPF) one way is to incorporate high levels of UV-A and UV-B sunscreens.
• SPF sun protection factor
• UVAPF UV-A protection factor
• the structure of the blend of silicone elastomer and solvent may collapse which render it ineffective in providing desired sensorial properties.
• the sunscreen composition may further comprise an emollient oil such as caprylic/capric triglycerides to act as a co-solvent for better dispersing UV-A sunscreen agents.
• an emollient oil such as caprylic/capric triglycerides to act as a co-solvent for better dispersing UV-A sunscreen agents.
• caprylic/capric triglycerides is a bad solvent for silicone elastomers that will also cause the structure of the blend of silicone elastomer and solvent to collapse.
• the dual (alkyl and phenyl) modified silicone elastomer shows the best compatibility with organic sunscreen agents, providing a sunscreen composition with enhanced stability and desired sensorial property. Additionally, it has been also found unexpectedly that dual (alkyl and phenyl) modified silicone elastomer also showed excellent compatibility with emollient oils that act as co-solvents.
• the present invention is concerned with a personal care composition
• a personal care composition comprising:
• the solvent is a volatile silicone oil selected from octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, blends of methyl trimethicone and dimethicone and mixtures thereof; and
• silicone elastomer has the chemical structure of formula I,
• each Ri is independently C4-36 alkyl chain, preferably C 8 -is;
• each Pt2 is independently phenyl or CH 3 ;
• each R 3 is independently phenyl
• the present invention is directed to a packaged personal care product comprising the personal care composition of the first aspect of this invention.
• the present invention is directed to a method of using the personal care composition of any embodiment of the first aspect of this invention to provide skin care benefit.
• Alkyl mole content as used herein means the ratio of moles of alkyl substituted dimethicone units to the total moles of dimethicone units per mole of silicone elastomer unit, unless otherwise specified.
• Phenyl mole content as used herein means the ratio of moles of phenyl substituted dimethicone units to the total moles of dimethicone units per mole of silicone elastomer unit, unless otherwise specified.
• a Personal Care Composition as used herein, is meant to include a composition for topical application to the skin of mammals, especially humans. Such a composition may be generally classified as leave-on or rinse off but is preferably of the leave on type.
• the composition is formulated into a product which is applied to a human body specifically for improving appearance but may also be capable of providing cleansing, odor control or general aesthetics.
• the composition of the present invention can be in the form of a liquid, lotion, cream, foam, scrub, gel, or toner, or applied with an implement or via a face mask or a pad.
• Non-limiting examples of such compositions include leave-on skin lotions, creams, antiperspirants, deodorants, lipsticks, foundations, mascara, sunless tanners and sunscreen lotions.
• the composition of the present invention is preferably a leave-on composition.
• “Skin” as used herein is meant to include skin on the face and body (e.g., neck, chest, back, arms, underarms, hands, legs, buttocks and scalp) and especially to the sun exposed parts thereof.
• a Sunscreen Composition is meant to include a composition for topical application to sun-exposed areas of the skin and/or hair of mammals, especially humans. Such a composition may be generally classified as leave-on or rinse off, and includes any product applied to a human body for also improving appearance, cleansing, odor control or general aesthetics. It is preferably a leave-on product.
• the composition of the present invention can be in the form of a liquid, serum, lotion, cream, gel or toner, and may be applied with an implement or via a face mask, pad or patch.
• the composition is in the form of a lotion or cream.
• a particularly preferred example of such a composition is a leave-on skin cream.
• Skin as used herein is meant to include skin on the face and body (e.g. neck, chest, back, arms, underarms, hands, legs, buttocks and scalp) and especially to the sun exposed parts thereof.
• the composition of the invention is also of relevance to applications on any other keratinous substrates of the human body other than skin e.g. hair where products may be formulated with specific aim of providing photoprotection.
• the composition of the invention comprises a UV-A sunscreen agent selected from the group consisting of a dibenzoylmethane derivative, a triazine derivative, a benzophenone derivative and mixtures thereof.
• the UV-A sunscreen agent comprises or is a dibenzoylmethane derivative, for example, butyl methoxydibenzoylmethane (sold under the trade name Parsol 1789).
• the composition comprises 0.1 to 30% by weight of an organic sunscreen agent.
• the sunscreen composition of the present invention comprises from 0.1 to 15% by weight of the UV-A sunscreen agent, more preferably from 0.1 to 10%, most preferably from 1 to 5%, based on the total weight of the sunscreen composition and including all ranges subsumed therein.
• the composition of the invention also comprises a UV-B sunscreen agent.
• Suitable UV-B sunscreen agent of the invention is selected from the group consisting of a benzophenone, an anthranilate, a salicylate, a cinnamate, a camphor, benzylidene malonate, a triazone, and derivatives thereof.
• the UV-B sunscreen agent comprises or is a cinnamate derivative, for example, ethylhexyl methoxycinnamate (sold under the trade name Parsol MCX).
• the sunscreen composition of the present invention comprises from 0.1 to 20% by weight of the UV-B sunscreen agent, more preferably from 0.5 to 18%, most preferably from 1 to 15%, based on the total weight of the sunscreen composition and including all ranges subsumed therein.
• the composition is substantially free of an organic sunscreen agent.
• Silicone elastomer as used herein, means cross-linked particles of a silicone polymer that swells significantly in a solvent forming a space filling material which behaves as a visco- elastic soft solid.
• the silicone elastomers are used in a blend of silicone elastomer and solvent, which is a dispersion of the silicone elastomer in the solvent.
• the blends of silicone elastomer and solvent are cross-linked gels that can be prepared through a hydrosilylation reaction. The reaction involves low levels of catalyst, usually platinum derivatives, and is generally run into an adequate solvent.
• Silicone-hydride (SiH) containing silicone polymers are reacted with di-vinyl materials to link independent silicone chains.
• the solvent suitable for dispersing silicone elastomers is a low molecular weight linear or cyclic silicone oil.
• the elastomer can be swollen with the low molecular weight silicone oil under a shear force.
• the low molecular weight silicone oil is preferably a volatile oil, although non-volatile oils can also be used.
• the volatile silicone oil as per the present invention has a vapor pressure value at 25°C of 2.6 to 1400 Pa.
• Particularly preferred volatile oils are linear siloxanes containing from 3 to 9 silicon atoms, and cyclic siloxanes having from 4 to 6 silicon atoms such as cyclopentasiloxane.
• the solvent is a volatile silicone oil.
• volatile silicone oils that may be used in this invention as a solvent for silicone elastomers include, for example, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, blends of methyl trimethicone and dimethicone and mixtures thereof or the like.
• Examples of commercially available volatile silicone oils include oils having grade designations 344, 345, 244, 245 and 246 from Dow corning Corporation.
• the volatile silicone oil is decamethylcyclopentasiloxane, which is made commercially available, for example, from supplier like Dow Corning Corporation under the trade name DC245.
• the blend of silicone elastomer and solvent is a blend of silicone elastomer and volatile silicone oil.
• the blend of silicone elastomer and solvent comprises from 30% to 96% by weight of the solvent, more preferably from 50% to 94%, and most preferably from 67% to 92%.
• Silicone elastomers suitable for use in the present invention are functional silicone elastomers that are modified by grafting functional groups onto the backbones of elastomers.
• the functional silicone elastomers used in this invention are alkyl modified, phenyl modified and/or dual (alkyl and phenyl) modified silicone elastomers.
• Alkyl modified functional silicone elastomer may be prepared from the reaction of a) a silicone-hydride containing polysiloxane; b) an alkene; and c) a vinyl-terminated dimethylpolysiloxane by using a hydrosilylation catalyst.
• the silicone-hydride containing polysiloxane has the general formula:
• each a is independently an integer from 0 to 300, preferably from 5 to 50; and each b is independently an integer from 2 to 300, preferably from 5 to 30;
• Silicone-hydride content as used herein, means the moles of silicone-hydride groups per gram of polysiloxane. Typically, the silicone-hydride content of the polysiloxane ranges from 0.016 to 16.6 mM/g, more preferably from 1 to 10 mlWg, and most preferably from 3 to 8 mM/g, based on the total weight of the polysiloxane and including all ranges subsumed therein.
• the silicone-hydride containing polysiloxane has a viscosity from 10 to 1000 centistokes (cSt), preferably from 20 to 500 cSt, more preferably from 25 to 150 cSt, and most preferably from 30 to 80 cSt.
• cSt centistokes
• Suitable silicone-hydride containing polysiloxanes which are commercially available include Andisil XL-10, Andisil XL-1 1 , Andisil XL-15 from AB Specialty Silicones.
• the alkene is an unsaturated hydrocarbon that contains at least one carbon-carbon double bond.
• Alkenes have two hydrogen atoms less than the corresponding alkane (with the same number of carbon atoms) with the general formula C n H 2n .
• the alkene suitable for use in the reaction has carbon chain lengths ranging from C 8 to Ci 8 .
• the alkene is octene, dodecene, hexadecene or mixtures thereof.
• he vinyl-terminated dimethylpolysiloxane has the general formula:
• each k is independently an integer from 4 to 1000, preferably from 40 to 500.
• the vinyl-terminated dimethylpolysiloxane contains vinyl side groups which may be available for reaction with silicone-hydride containing polysiloxane.
• Vinyl content as used herein means the moles of vinyl group per gram of the vinyl- terminated dimethylpolysiloxane.
• the vinyl content of the vinyl-terminated dimethylpolysiloxane ranges from 0.05 to 3 mM/g, more preferably from 0.1 to 1 mM/g, and most preferably from 0.2 to 0.8 mM/g, based on the total weight of the vinyl-terminated dimethylpolysiloxane and including all ranges subsumed therein.
• the vinyl-terminated dimethylpolysiloxane has a viscosity from 10 to 1000 cSt, preferably from 20 to 500 cSt, more preferably from 50 to 400 cSt and most preferably from 100 to 250 cSt.
• Suitable vinyl-terminated dimethylsiloxanes which are commercially available include Andisil VS-200 from AB Specialty Silicones.
• the alkene reacts with the silicone-hydride containing polysiloxane to form an alkyl modified polysiloxane, which reacts with the vinyl-terminated dimethylpolysiloxane to form the alkyl modified silicone elastomer.
• the alkyl mole content of the alkyl modified silicone elastomer is typically in the range from 0.01 to 0.99, more preferably from 0.02 to 0.20.
• the alkyl modified functional silicone elastomer has the general formula: wherein:
• each R 4 is independently C4-36 alkyl chain, preferably Cs-is;
• Phenyl modified functional silicone elastomer may be prepared from the reaction of a) a silicone-hydride containing polysiloxane; and b) a vinyl-terminated dimethyl phenyl polysiloxane by using a hydrosilylation catalyst.
• the silicone-hydride containing polysiloxane is the same as described above.
• the vinyl-terminated dimethyl phenyl polysiloxane has the general formula: wherein:
• each R 5 is independently phenyl or CH 3 ;
• each R 6 is independently phenyl
• each f is independently an integer from 4 to 1000, preferably from 40 to 500; and each g is independently an integer from 1 to 100, preferably from 5 to 30.
• the vinyl-terminated dimethyl phenyl polysiloxane contains vinyl side groups which may be available for reaction with silicone-hydride containing polysiloxane.
• Phenyl mole content as used herein, means the ratio of moles of phenyl substituted dimethicone units to the total moles of dimethicone units of the vinyl-terminated dimethyl phenyl polysiloxane.
• the phenyl mole content of the vinyl-terminated dimethyl phenyl polysiloxane ranges from 1 to 50%, more preferably from 3 to 30% and most preferably from 7 to 15%.
• the vinyl-terminated dimethyl phenyl polysiloxane has a viscosity from 100 to 10000 cSt, preferably from 500 to 8000 cSt, more preferably from 800 to 5000 cSt and most preferably from 1000 to 2000 cSt.
• Suitable vinyl-terminated dimethyl phenyl polysiloxane which are commercially available include Andisil SF-2430 from AB Specialty Silicones.
• the silicone-hydride containing polysiloxane and the vinyl-terminated dimethyl phenyl polysiloxane are present in the reaction mixture in a weight ratio from 1 :200 to 200:1 , more preferably from 1 :50 to 50:1 , most preferably from 1 :30 to 30:1 .
• the phenyl mole content of the phenyl modified silicone elastomer is typically in the range from 0.01 to 0.50, preferably from 0.03 to 0.34.
• the phenyl modified functional silicone elastomer has the general formula:
• each R 7 is independently phenyl or CH 3 ;
• each R 8 is independently phenyl
• Dual (alkyl and phenyl) modified silicone elastomer may be prepared from the reaction of a) a silicone-hydride containing polysiloxane; b) an alkene; and c) a vinyl-terminated dimethyl phenyl polysiloxane by using a hydrosilylation catalyst.
• the silicone-hydride containing polysiloxane, the alkene and the vinyl-terminated dimethyl phenyl polysiloxane are the same as described above.
• the dual modified silicone elastomer may be prepared through a two-step synthesis by combining the reactants.
• the alkene reacts with the silicone-hydride containing polysiloxane to form an alkyl modified polysiloxane.
• the left unsubstituted silicone-hydride groups on the alkyl modified polysiloxane react with the vinyl side groups on the vinyl-terminated dimethyl phenyl polysiloxane to form the dual modified silicone elastomer.
• the temperature of the reaction mixture may be any suitable temperature at which the silicone-hydride containing polysiloxane and the alkene can react to form the alkyl modified polysiloxane.
• the temperature of the reaction mixture is from 5 °C to 100 °C, more preferably from 10 °C to 80 °C and most preferably from 20 °C to 60 °C.
• the reaction time for the first step is at least 5 mins, more preferably at least 10 mins, most preferably from 20 to 60 mins.
• the temperature of the reaction mixture may be any suitable temperature at which the alkyl modified polysiloxane and the vinyl-terminated dimethyl phenyl polysiloxane can react to form the dual modified silicone elastomer.
• the temperature of the reaction mixture is from 10 °C to 120 °C, more preferably from 20 °C to 100 °C and most preferably from 40 °C to 80 °C.
• the reaction time for the second step is at least 1 hour, more preferably at least 2 hours, most preferably from 3 hours to 6 hours.
• the alkyl mole content of the dual (alkyl and phenyl) modified silicone elastomer is typically in the range from 0.01 to 0.99, more preferably from 0.02 to 0.20.
• the phenyl mole content of the dual (alkyl and phenyl) modified silicone elastomer is typically in the range from 0.01 to 0.50, preferably from 0.03 to 0.34.
• the dual (alkyl and phenyl) modified silicone elastomer has the general formula: wherein:
• each Ri is independently C4-36 alkyl chain, preferably Cs-is;
• each R 2 is independently phenyl or CH 3 ;
• each R 3 is independently phenyl
• the blend of silicone elastomer and solvent preferably comprises from 1 to 70% by weight of silicone elastomer, more preferably from 5 to 50%, and most preferably from 8 to 30%.
• the blend of silicone elastomer and solvent preferably comprises the silicone elastomer and the solvent in a weight ratio from 1 :20 to 2:1 , more preferably from 1 :15 to 1 :1 , and most preferably from 1 :1 1 to 1 :2.
• the personal care composition of the present invention comprises the blend of silicone elastomer and solvent in an amount of from 0.1 to 60%, more preferably from 1 to 40%, most preferably from 5 to 30%, based on the total weight of the personal care composition and including all ranges subsumed therein.
• the personal care composition of the present invention may further comprise an emollient oil that act as a co-solvent.
• Suitable emollient oils include, for example, ester of alkoxylated aromatic alcohol with fatty carboxylic acid, esters of polyglycols or diols with fatty carboxylic acid such as caprylic/capric triglyceride, ester of fatty alcohol and fatty acid, alkoxylated derivative of benzyl alcohol and mixtures thereof.
• the emollient oil is caprylic/capric triglyceride.
• the personal care composition of the present invention comprises co-solvent in an amount from 0.01 to 10%, more preferably from 0.1 to 8%, most preferably from 1 to 6%, based on the total weight of the personal care composition and including all ranges subsumed therein.
• the personal care composition of the invention comprises a cosmetically acceptable carrier.
• the carrier may be a liquid or solid material.
• carrier is present in an amount ranging from 10 to 99.9%, more preferably from 20 to 95%, most preferably from 40 to 85% by total weight of the personal care composition including all ranges subsumed therein.
• the cosmetically acceptable carrier includes water. Water is preferably included in an amount from 30 to 90%, more preferably from 30 to 85%, most preferably from 30 to 80% by total weight of the personal care composition.
• suitable carrier classes include silicones, polyhydric alcohols, hydrocarbons, triglycerides and thickening powders.
• the personal care composition of the invention may be in any form including toners, lotions, creams, mousses, scrub, serum or gel that is suitable for topical application to the skin.
• the personal care composition can be either a leave-on product such as skin lotions, creams, antiperspirants, deodorants, lipsticks, foundations, mascara, sunless tanners and sunscreen lotions or a rinse-off product such as shampoos, conditioners, shower gels and toilet bars. It is preferred that the personal care composition is a skin lotion or a cream.
• the personal care composition may additionally comprise other sunscreen agents such as inorganic sunscreens.
• sunscreen agents such as inorganic sunscreens.
• inorganic sunscreens zinc oxide, titanium dioxide, iron oxide, silica such as fumed silica.
• the amount of such sunscreen agents is preferably incorporated from 0.1 to 5% by total weight of the personal care composition.
• a skin lightening agent may also be incorporated into the composition of the invention.
• Suitable skin lightening agents include vitamin B3 and its derivatives (e.g. niacin, nicotinic acid, niacinamide), kojic acid, arbutin, tranexamic acid, placental extract, ascorbic acid and its derivatives (e.g.
• the skin lightening agent is present in an amount from 0.1 to 10%, more preferably from 0.2 to 5%, most preferably from 0.3 to 3% by total weight of the personal care composition including all ranges subsumed therein.
• the personal care composition may also comprise other ingredients which are common in the art to enhance physical properties and performance. Suitable ingredients include but are not limited to humectants, thickeners, opacifiers, binders, colorants and pigments, pH adjusting agents, preservatives, optics, perfumes, viscosity modifiers, biological additives, buffering agents, conditioners, natural extracts, essential oils and skin benefit agents including anti-inflammatory agents, cooling agents, antiperspirant agents, anti-aging agents, anti-acne agents, anti-microbial agents and antioxidants.
• the invention is further concerned with a method of using the personal care composition to provide enhanced skin care benefit.
• This example demonstrates the structuring benefit of functional silicone elastomers.
• the base formulation used is listed in table 1 . All ingredients are expressed by weight percent by the total formulation, and as level of active ingredient.
• Silicone elastomer/DC245 blend is selected from in-house prepared non-functional silicone elastomer (NSE)/DC245 blend and dual modified (alkyl and phenyl) silicone elastomer (DSE)/DC245 blend.
• Silicone-hydride containing polysiloxane (Andisil XL-10), vinyl-terminated dimethylpolysiloxane (Andisil VS-200), vinyl-terminated dimethyl diphenyl polysiloxane (Andisil SF-2430) were purchased from AB Specialty Silicones. Decamethylcyclopentasiloxane (DC245) was purchased from Dow Corning Corporation. Platinum catalyst is platinum (0)-1 ,3-divinyl-1 ,1 ,3,3-tetramethyldisiloxane complex solution- in xylene from Sigma Aldrich. All the chemicals were used as received without further purification.
• Solid content refers to the weight percentage of silicone elastomers in the blend of silicone elastomer and solvent.
• the gelled mixtures (blends of silicone elastomer and solvent) were diluted to a solid content of 14.5%. Samples were prepared by adding different blends of silicone elastomer and solvent of the same amount and different amounts of thickener agent in the base formulation.
• Stability Test Stability refers to the composition maintaining its appearance, odor and main structure without phase separation. Samples were poured into plastic bottles and filled up to 2/3 of the bottles. Then the samples were stored at 50 °C in an oven. For stability test, samples were checked daily. The appearance of samples were observed and recorded. The observation was taken when the samples were still warm and then the samples were left in the oven for 24 hours before another observation was taken.
• the storage modulus and loss modulus represent the viscoelastic property.
• the storage modulus (initial G') represents the elasticity.
• the acceptable range of the storage modulus (initial G') was from 800 Pa to 4000 Pa in personal care application.
• This example demonstrates the structuring benefit of functional silicone elastomers with the presence of an organic sunscreen agent.
• the base formulation used is listed in table 3. All ingredients are expressed by weight percent by the total formulation, and as level of active ingredient.
• DC245 is a commercial decamethylcyc opentasiloxane from Dow Corning.
• Silicone elastomer/DC245 blend is selected from in-house prepared non-functional silicone elastomer (NSE)/DC245 blend and dual modified (alkyl and phenyl) silicone elastomer (DSE)/DC245 blend.
• Parsol MCX is ethylhexyl methoxycinnamate.
• the sensorials delivered by the composition of the invention was compared to that of a composition outside the invention in a QDA (qualitative descriptive analysis) test.
• the evaluation was done by trained female respondents with good sensitivity.
• IMD Spreadability, Thickness, Oily, Drag IMD, and Oily IMD
• IMD/5min Silky smooth IMD, Sticky tacky IMD, Drag 5min, Oily 5min, Silky smooth 5min, Sticky tacky 5min
• This example demonstrates the compatibility of silicone elastomers and organic sunscreen agents.
• the base formulation used is listed in table 5. All ingredients are expressed by weight percent by the total formulation, and as level of active ingredient.
• DC245 is a commercial decamethylcyc opentasiloxane from Dow Corning.
• Silicone elastomer/DC245 blend is selected from in-house prepared non-functional silicone elastomer (NSE)/DC245 blend, alkyl modified silicone elastomer (ASE)/DC245 blend, phenyl modified silicone elastomer (PSE)/DC245 blend and dual modified (alkyl and phenyl) silicone elastomer (DSE)/DC245 blend.
• NSE non-functional silicone elastomer
• ASE alkyl modified silicone elastomer
• PSE phenyl modified silicone elastomer
• DSE dual modified (alkyl and phenyl) silicone elastomer
• Parsol MCX is ethylhexyl methoxycinnamate.
• Silicone-hydride containing polysiloxane (Andisil XL-10), vinyl-terminated dimethylpolysiloxane (Andisil VS-200), vinyl-terminated dimethyl diphenyl polysiloxane (Andisil SF-2430) were purchased from AB Specialty Silicones. Decamethylcyclopentasiloxane (DC245) was purchased from Dow Corning Corporation. Platinum catalyst is platinum (0)-1 ,3-divinyl-1 ,1 ,3,3-tetramethyldisiloxane complex solution- in xylene from Sigma Aldrich. All the chemicals were used as received without further purification.
• Solid content refers to the weight percentage of silicone elastomers in the blend of silicone elastomer and solvent.
• Samples were prepared by adding different blends of silicone elastomer and solvent of the same amount and different amounts of sunscreen agent Parsol MCX in the base formulation.
• Sample 1 comprised non-functional silicone elastomer (NSE).
• Sample 2 comprised alkyl modified silicone elastomer (ASE).
• Sample 3 comprised phenyl modified silicone elastomer (PSE).
• Sample 4 comprised dual modified (alkyl and phenyl) silicone elastomer (DSE).
• Stability refers to the composition maintaining its appearance, odor and main structure without phase separation. Samples were poured into plastic bottles and filled up to 2/3 of the bottles. Then the samples were stored at 50 °C in an oven. For stability test, samples were checked daily. The appearance of samples were observed and recorded. The observation was taken when the samples were still warm and then the samples were left in the oven for 24 hours before another observation was taken.
• Sample 7 comprising non-functional silicone elastomer showed bad compatibility with sunscreen agents.
• sunscreen agents were added in an amount higher than 10 wt%, the formulation became unstable with slightly oil leakage.
• Sample 10 comprising dual modified silicone elastomer showed the best compatibility with sunscreen agents among all the samples. The formulation maintained good stability even when 15 wt% of sunscreen agents were added.
• Thin film transmittance measurements were carried out using LabSphere UV-2000S SPF meter.
• Poly(methyl methacrylate) (PMMA) plates were used as substrates. Samples were uniformly applied onto the PMMA substrates with a density of 2 mg/cm 2 . After drying for 15 mins, the sample plates were exposed under standard UV lamp and transmittance scan was carried out for the sample plates. Nine different spots were scanned for each sample plate. The same sample was tested three times. The reference transmittance was obtained using a blank PMMA plate coated with glycerine with a density of 1 .3 mg/cm 2 . The transmittance values were converted to SPF values using the LabSphere software provided with the instrument.
• Sample 10 comprising dual modified silicone elastomer provides higher SPF values compared to Samples 7 and 9. Table 4 further showed that the SPF values of Sample 10 increased with an increase of the amount of sunscreen agents in the formulation.
• compositions comprising dual modified (alkyl and phenyl) silicone elastomer. All ingredients are expressed by weight percent by the total formulation, and as level of active ingredient.
• Parsol 1789 is butyl methoxydibenzoylmethane.
• Samples were prepared by adding different blends of silicone elastomer and solvent (with a solid content of 14.5%) of the same amount in the formulation. The same protocol was used to measure the in vitro SPF values of the compositions as described in Example 4.
• This example demonstrates the effect of the concentration of a blend of dual modified silicone elastomer and solvent in the composition on the sunscreen performance. All ingredients are expressed by weight percent by the total formulation, and as level of active ingredient.
• DC245 a Balance Balance Balance Balance
• Samples were prepared by adding different amounts of the blend of dual modified silicone elastomer and solvent (with a solid content of 14.5%) in the formulation. The same protocol was used to measure the viscosities and in vitro SPF values of the compositions as described in Examples 3 and 4.
• samples comprising lower amount of a blend of dual modified silicone elastomer and solvent showed higher SPF values.
• Sample 15 comprising 10.5% by weight of a blend of dual modified silicone elastomer and solvent showed superior sunscreen performance to other samples.
• Example 7 This example demonstrates the compatibility of silicone elastomers and co-solvent caprylic/capric triglycerides (GTCC). All ingredients are expressed by weight percent by the total formulation, and as level of active ingredient.
• GTCC co-solvent caprylic/capric triglycerides
• Samples were prepared by adding different blends of silicone elastomer and solvent (with a solid content of 14.5%) of the same amount in the formulation. The same protocol was used to measure the viscosities and stability of the compositions as described in Example 3.
• samples comprising dual-modified silicone elastomer showed much better compatibility with co-solvent caprylic/capric triglycerides than those comprising nonfunctional silicone elastomer.
• Sample 16 comprising GTCC in an amount higher than 5 wt% still maintained good viscosity, indicating the blend of silicone elastomer and solvent maintained its structure.
• sunscreen agents were added into the compositions, samples comprising dual modified silicone elastomer showed much better compatibility with co- solvent caprylic/capric triglycerides than those comprising non-functional silicone elastomer.
• Sample 28 was stable for 67 days while Sample 29 became unstable after 2 hours.

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• 2017
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