Title of Invention	A PERSONAL CARE COMPOSITION SUITABLE FOR PACKAGING IN A METAL CAN
Abstract	A personal care composition suitable for packaging in a metal can, the composition including a corrosion-inhibiting additive which is a combination of a benzoate salt and an oxazolidine.

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FORM2 THE PATENTS ACT, 1970 (39 of 1970) COMPLETE SPECIFICATION (See section 10; rule 13) Title of the invention A personal care composition suitable for packaging in a metal can HINDUSTAN LEVER LIMITED, a company incorporated under the Companies Act, 1913 of Hindustan Lever House, 165/166, Backbay Reclamation, Mumbai-400 020, State of Maharashtra, India The following specification (particularly) describes the nature of this invention (and the manner in which it is to be performed) A PERSONAL CARE COMPOSITION SUITABLE FOR PACKGING IN A METAL CAN FIELD OF THE INVENTION The invention concerns sprayable hair treatment such as hair styling mousses and mousse shampoos, dispensed from pressurisable metal cans. BACKGROUND AND PRIOR ART Spray car.s such as pumps or aerosols are widely used as delivery systems for hair treatment products. The problem of can corrosion is becoming particularly apparent as the transition to water-based formulations takes place for cost and environmental reasons. In an attempt to overcome this problem, aluminium cans have been employed. Unfortunately, these materials are not as economical as ordinary tin-plated steel. Furthermore, aluminium cans can also be susceptible to corrosion. Corrosion is manifest as, tor example, unsightly rust and, for aerosol formulations, loss of propellent. Moreover, oxidation car. transform formulation components, such as those constituting the fragrance, with consequential adverse effects on odour. When corrosion is severe enough it, may ultimately cause leaking of the can in addition 10 contamination of the aerosol oroduct inside. In tin-plated cans, some amount of protection against corrosion is afforded by the tin, especially in the absence of any significant amount of water. However, produce forms such as mousses, e.g. styling mousses or aerosol shampoos will typically contain a significant amount of water. Furthermore, even for systems traditionally based on organic solvents rather than water, such as hairsprays, environmental concerns and cost considerations have forced replacement of the organic solvent with, at least in part, water. furthermore, pressurised cans require valves, which are inherently more susceptible to corrosion than the body of the can itself, since the valve material is necessarily highly stressed during the process of assembly, making it a focus for corrosive attack. As described in Boulden, "Corrosion Inhibitors for Water-Based Aerosol Formulations", Spray Technology and Marketing April 1993, the problem of corrosion has been a barrier to the introduction of many water-based aerosol formulations, even in aluminium containers, and there is no generally applicable solution to this problem. Recafort, "Preventing Corrosion, in Aqueous Based Aerosols", Spray Technology and Marketing December 1995, outlines the main approaches to minimising corrosion from fluids inside an aerosol container, of which one is the inclusion of corrosion inhibitors. The article describes some typical examples of the different types cf corrosion inhibitors (ohosphates, silicates, bicarbonates and amines; and gives screening results for a range of inhibitors tested individually. It is mentioned that the "optimum corrosion fix" would involve, Inzer alia, the utilisation of a synergistic combination of inhibitors simultaneously, but there is no specific guidance given on what the chemical constituents of such a combination might be. Examples of systems which have been found to be effective for corrosion inhibition in hairsprays are ammonium hydroxide, and a combination of sodium benzoate and cyclohexamine. Further examples are described in the following patents: U.S. Pat. No. 4,604,226 discloses an inhibitor system comprising a mixture of an amine neutralised phosphate ester and a volatile amine, the latter selected from cyclohexamine, morpholine and isopropylamine. U.S. Pat. No. 4,584,021 describes related technology wherein the inhibitor system is a mixture of nitroalkane and an amine neutralised phosphate ester. U.S. Pat. No. 4,263,275 reports a hydroalcoholic, pressurised hairsoray composition wherein the anticorrosion agent is a phosphate salt cf a quaternary ammonium compound. U.S. Pat. No. 5,343,731 discloses ammonium benzoate as an effective corrosion inhibitor for steel can packages containing sprayble heir treacent products particularly hairsoravs. The ammonium benzoate is oreferably employed in combination with ammonium hydroxide, since this combination is said to deliver-more than just an additive effect. US Pat. Mo. 4,573,569 describes a mousse hair product which comprises a long chain nonionic ester which is said to reduce corrosivity when used in combination with corrosion inhibitors. US Pat. No. 5,462,727 describes an aqueous hair spray composition having a corrosion inhibitor consisting essentially of C.05-5% of an alkyl benzoate and O.Cl-5% of an organic borate. WO 95/14528 discloses the use of certain bis-oxazolidine compounds as corrosion inhibitors. We have now found that a combination of a benzoate salt and an oxazolidine provides exceptionally effective corrosion inhibition. Surprisingly, the combination delivers more than just an additive effect. SUMMARY OF THE INVENTION The present invention provides a personal care composition suitable for packaging in a metal can, the composition including a corrosion-inhibiting additive which is a combination of a benzoate salt and an oxazolidine. DETAILED DESCRIPTION Benzoate Salt Examples of suitable benzoate salts according to the invention include alkali metal, alkaline earth metal and ammonium salts, and mixtures thereof. Sodium benzoate is particularly preferred. Amounts of the benzoate salt may range from 0.01 to 5%, preferably from 0.05 to 2%, optimally from 0.1 co i% by-weight based on total weight of the personal care composition. Oxazoiidine Compositions of the present invention contain a further corrosion inhibitor in the form of an oxazoiidine. Oxazolidines are produced when aldehydes are reached with primary amino alcohols. Examples of suitable oxazolidines according to the invention include monocyclic oxazolidines such as 4,4-dimethyl-l, 3-oxazolidine and 3, 4, 4-trimethyl-l,3-oxazolidine, bicyclic oxazolidines such as l-aza-3,7-dioxa-5-ethylbicycic (3.3.0) cccane, and mixtures thereof. Particularly preferred is -.,-.-dimethyl-1,3-oxatoiidine. The above materials are all available commercially from ANGUS Chemie GmbH under the tradenames CXA3AN®-A, E:03AX£ C5-1135, 0XA3AN®-E and 3IOBAN® C5-124 6. Particularly preferred is OXA3AN®-A, which is an aqueous solution of 4,4-dimethyl-1,3-oxazolidine. Amounts of the oxazolidine may range from 0.001 to 5%, preferably from 0.005 to 1%, optimally from 0.05 to 0.2% by weight based on total weight of the personal care composition. Product Form Compositions of the present invention can be formulated into a wide variety cf product types, including mousses, gels, lotions, tonics, sprays, shampoos, conditioners, rinses, hand and body lotions, facial moisturisers, sunscreens, anti-acne preparations, shaving foams, topical analgesics, mascaras, and the like. Shamcco Comoositions ■ ■ -The corrcsion-inhibiting additive of the present invention is particularly useful with shampoo compositions. Such compositions are generally characterised by containing at least one surfactant, to provide a cleansing benefit. Surfactant may also be present as emuisifier for amulsified conditioning agents which may be present in the shampoo, such as silicones. Further surfactant(s) will be present as an additional cleansing ingredient if sufficient for cleansing purposes i not provided as the emulsifier for the emulsified conditioning agents. This further cleansing surfactant may be the same surfactant as the emulsifier, or may be different. Suitable emulsifiers are well known in the art and include anionic and nonionic surfactants. Examples of anionic surfactants used as emulsifiers are alkylarylsulphonates, e.g., sodium dodecylbenzene sulphonate, alkyl sulphates e.g., sodium lauryl sulphate, alkyl ether sulphates, e.g., sodium lauryl ether sulphate nEO, where n is from 1 to 20 alkylphenol ether sulphates, e.g., octylphenol ether sulphate nEO where n is from 1 to 20, and sulphosuccinates, e.g., sodium dioctylsulphosuccinate. Examples of nonionic surfactants used as emulsifiers are alkylphenol ethoxylates, e.g., nonylphenol ethoxylate nEO, where, n is from 1 to, 50,. alcahal ethoxyiates, e...g,.., lauryl alcohol nEO, where n is from 1 to 50, ester ethoxyiates, e.g., polyoxyethylene monostearate where the number of oxyethylene units is from 1 to 30. Cleansing surfactants are typically selected from anionic, nonicnic, amphoteric and zwitterionic surfactants, and mixtures thereof. Suitable anionic cleansing surfactants for compositions of the invention include, the alkyl sulphates, alkyl ether sulphates, alkaryl sulphonates, alkanoyl isethionates, alkyl succinates, alkyl sulphosuccinates, N-alkoyl sarcosinates, alkyl phosphates, alkyl ether phosphates, alkyl ether carboxylates, alpha-olefin sulphonates and acyl methyl taurates, especially their sodium, magnesium ammonium and mono-, di- and triethanolamine salts. The alkyl and acyl groups generally contain from 8 10 18 carbon atoms and may be unsaturated. The alkyl ether sulphates, alkyl ether phosphates and alkyl ether carboxyiates may contain from one to 10 ethylene oxide or propylene oxide units per molecule, and preferably contain 2 to 3 ethylene oxide units per molecule. Examples of suitable anionics include sodium lauryl sulphate, sodium lauryl ether sulphate, ammonium lauryl sulphosuccinate, ammonium lauryl sulphate, ammonium lauryl ether sulphate, sodium dodecylbenzene sulphonate, triethanolamine dodecylbenzene sulphonate, sodium cocoyl isethionate, sodium lauroyl isethionate, and sodium N-lauryl sarcosinate. Mcnionic cleansing surfactants suitable for use in shampoo compositions of the invention may include condensation products of aliphatic (C8-C18) primary cr secondary linear cr branched chain alcohols or phenols with alkylene oxides, usually ethylene oxide and generally having from 6 to 3D ethylene oxide croups. Other suitable nonionics include alkylpolycosides and mono- or di-alkyl alkanolamides. Examples of the latter ncr.icnics include coco mono- or di-ethanolamide and coco -mono-isopropanolamide. Amphoteric and zwitterzonic cleansing surfactants suitable for use in compositions of the invention may include alkyl amine oxides, alkyl betaines, alkyl amidopropyl betaines, alkyl sulphobetaines (sultaines), alkyl glycinates, alkyl carboxyglycinates, alkyl amphopropionates, alkylamphoglycinates and alkyl amidopropyl hydroxysultaines. Examples include lauryl amine oxide, eoeodimethyl suiphcpropyl betaine and preferably lauryl betaine, cocamidopropyl betaine and sodium cccamphopropionate. The total amount of surfactant (including any used as emuisifier for the conditioning agent) is generally from 1 to 50%, preferably from 5 to 30%, more preferably from 10% to 25%, by total weight cf surfactant based on total weight of the shampoo composition. r The shampoo composition will typically comprise a predominantly aqueous carrier, water forming the continuous phase in which any particles of water-insoluble conditioning agent are dispersed. Water is generally present in an amount of from 10 to 99%, preferably from 20 to 80%, more preferably from 4 0 to 75%, by total weight cf water based on total weight of the shampoo composition. A particularly preferred product form according- to the invention is an aerosol shampoo mousse based on surfactant and water as described above and further containing an aerostl orooeliant. This agent is responsible for excelling the other materials from the container and forming the mousse character. The propellant gas can be any liquefiable gas conventionally used for aerosol containers. Examples of suitable propellents include dimethyl ether, propane, n-butane and isobutane, used singly or admixed. Other examples of propellents are nitrogen, carbon dioxide, compressed air and fluorohydrocarbons such as the material sold by Du Pone under the trade name DYMEL® 152a. The amount of the propellent gases is governed by normal factors well known in the aerosol art. For mousses the level of propellent is generally from about 1 to about 15%, optimally from about 2 to about 10% for creamy foam and good sensory feel. Hair Stvlina Compositions The corrosion-inhibiting additive of the present invention is also particularly useful with hair styling compositions. These compositions are characterised by containing at least one hair styling polymer. Hair styling polymers are well known articles of commerce and many such polymers are available commercially which contain moieties which render the polymers cat ionic, anionic, amphoteric or nonionic in nature. The polymers may be synthetic or naturally derived. The amount of the polymer may range from 0.5 to 10%, preferably 0.75 to 6% by weight of the total composition. Examples of anionic hair scyling polymers are: copolymers of vinyl acetate and crotonic acid; terpolymers of vinyl acetate, crotonic acid and a vinyl ester of an alpha-branched saturated aliphatic monocarboxylic acid such as vinyl neodecanoate; copolymers of methyl vinyl ether and maleic anhydride (molar ratio about 1:1) wherein such copolymers are 50% esterified with a saturated alcohol containing from 1 to 4 carbon atoms such as ethanol or butanol; acrylic copolymers containing acrylic acid or methacrylic acid as the anionic radical-containing moiety-with other monomers such as: esters of acrylic or methacrylic acid with one or more saturated alcohols having from 1 to 22 carbon atoms (such as methyl methacrylate, ethyl acrylate, ethyl methacrylate* n-butyl, acrylate, t-butylacrylate, t-butyl methacrylate, n-butyl methacrylate, n-hexyl acryla-e, n-octyl acrylate, lauryl methacrylate and behenyl acrylate); glycols having from 1 to 5 carbon acorns (such as hydroxypropyl methacrylate and hydroxyethyl acrylate); styrene; vinyl caprolactam; vinyl acetate; acrylamide; alkyl acrylamides and methacrylamides having 1 to 3 carbon acorns in the alkyi group (such as nethacrylamide, t-butyl acrylamids and n-octyl acrvlamide and other compasilelium, unsaturated monomers. The polymer may also contain grafted silicone, such as Dolydimethyisiloxane. Specific examples of suitable anionic hair styling polymers are: RESYN® 28-2930 available from National Starch (vinyl acetate/crotonic acid/vinyl neodecanoate copolymer); ULTRAKOLD® 3 available from BASF (CTFA designation Acrylates/acrylamide copolymer); the GANTRZZ® ES series available from IS? Corporation esterified copolymers of methyl vinyl ether and maleic anhydride). Other suitable anionic hair styling polymers include carboxylated polyurethanes . Carboxylated poiyurethane resins are linear, hydroxyl-terminated copolymers having pendant carboxyl groups. They may be ethoxylated and/or propoxylated at least a- one terminal end. The carboxyl group can be a carcoxylic acid group or an ester group, wherein the alkyl moiety of the ester group contains one to three carbon atoms. The carboxylated poiyurethane resin can also be a copolymer of polyvinylpyrrolidone and poiyurethane, having a CTFA designation PV?/pciycarbamyi polyglycol ester. Suitable carboxylated poiyurethane resins are disclosed in FP 0 619 111 A1 and US Patent Mo. 5,000,955. Other suitable hydrophtiic poiyurethanes are disclosed in US Patent Nos. 3,822,233; 4,156,066; 4,156,067; 4,255,550; and 4,74 3,573. Amphoteric polymers which can contain cationic groups derived from monomers such as t-butyl aminoethyl methacryiate as well as carboxyl groups derived from monomers such as acrylic acid or methacrylic acid can also be used in the present invention. One specific example of an amphoteric hair styling polymer is Amphomer® (Octylacrylamide/acrylates/butylaminoethyl methacryiate copolymer) sold by the National Starch and Chemical . Corporation. Examples of nonionic hair styling polymers are homopolymers of N- vinyipyrrolidone and copolymers of N-vinylpyrrolicone with compatible nonionic monomers such as vinyl acetate. Nonionic polymers containing N- vinyipyrrolidone in various weight average molecular weights are available commercially from ISP Corporation - specific examples of such materials are homopolymers of N-vinylpyrrolidone having an average molecular weight of about 630,000 sold under the name PVP K- 90'and are homopoiymers of N-vinylpyrrolidone having an average molecular weight of about 1,000,000 sold under the name of PVP K-120. Other suitable nonionic hair styling polymers are cross-linked silicone resins or gums. Specific examples include rigid silicone polymers such as those described in Ir-A-243 35C and cross-linked silicone gums such as those describee in WO 96/31188. Examples of cationic hair styling polymers are copolymers of amir.o-functional acrylate monomers such as lower alkyl aminoalkyl acryiate, or methacrylate monomers such as dimethyiaminoethyi methacrylate, with compatible monomers such as N-vinylpyrrolidone, vinyl caprolactam, alkyl methacryiates (such as methyl methacrylate and ethyl methacrylate) and alkyl acrylates (such as ethyl acryiate and n-butyl acryiate). Specific examples of suitable cationic polymers are: copolymers of N-vinylpyrrolidone and dimethyiaminoethyl methacrylate, available from ISP Corporation as Copolymer 845, Copolymer 937 and Copolymer 95S; copolymers of N-vinyipyrrolidone and dimethylaminopropylacrylamide or methacrylamide, available from ISP Corporation as Styleze® CC10; copolymers of vinylcaprciactam, N-vinylpyrrolidone and dimethylaminoethylmethacrylate; Polyquaternium-4 (a copolymer of diaiiyidimonium chloride and hydroxyethylcellulcse); aminoethyimethacrylate) , available from IS? as Gafquat® 734, 755 anci 7 5 5N, and from BASF as Luviquat® PQ11; Polyquaternium-16 (formed from metnylvinylimidazolium chloride and vinyipyrroiidone), available from BASF as Luviquat@FC 37 0, FC 550, FC 90 5 and HM-552; Polyquaternium-4 6 (prepared by the reaction of vinylcaprolactam and vinyipyrroiidone with methylvinylimidazolium methosulphate), available from BASF as Luviquat®Hold. Examples of suitable naturally derived polymers include shellac, alginates, gelatins, pectins, starch, cellulose derivatives and chitosan or salts and derivatives thereof. Commercially available examples include Kytamer® (ex Amerchol) and Amaze® (ex National Starch). With certain of the above-described polymers it may be necessary to neutralise some acidic groups to promote soiubiiity/dispersibility. Examples of suitable neutralising- agents include 2-amino-2- methyi-1, 3-propanediol (AMPD); 2-amino-2-ethyl-l,3-propanediol (A2PD); 2-amino-2-methyl-l-propancl (AM?) ; 2-amir.o-l-butanol (AB) ; monoethanolamine (MEA); ciethanciamine (DEA); triethanolamine (TEA); moncisopropanoiamine (MIPA); diiscpropancl-amir.e (DIPA); triisopropanoiamine (TIPA) ; and dimethyl stearamiae (DMS) . A long chain amine neutralising agent such as stearamidoprpyl dimethylamine or lauramidoprocyl dimethyliamine may be employed, as is described in US 4,874,604. Also suitable are inorcanic neutralisers, examples of which include sodium, hydroxide, parassium hydroxide and borax. Mixtures of any of "he above neutralising agents may be used. Amounts of the neutralising agents will range from about C.001 to about 10% bv weight of the total composition. Hair styling compositions are typically formulated as sprays, mousses, lotions or gels and can be in aerosol or nonaerosol forms. If an aerosol product form is desired, a propellant must be included in the composition. Suitable propellants are described above in the context of aerosol shampoo mousses. For hairsprays the level of propellant is generally from 3 to 80%, preferably from 5 to 60%, optimally from 30% to 50% by weight of propellant based on total weight of the hairspray. Other Ingredients Compositions according- to the present invention may contain any other ingredient normally used in personal care compositions, and depending on the intended use of the composition. These other ingredients nay include bacteriostats (such as triclosan) for deodorants, perspiration inhibitors (such as aluminium or zirconium salts) for antiperspirants, conditioning agents (such as emollients, lubricants and moisturisers), for skin or hair ctnditioning products such as post-wash hair conditioners, hair or body conditioning shampoos and shaving foams, colouring agents, antifoam agents, antioxidants, fragrances, antimicrobials, solvents for components such as hair stylinc Dolymers, and sunscreens. Each cf these ingredients will be present ir. ar. amount effective to accomplish its purpose. Examples of preferred optional ingredients in compositions of this invention are adjuvants suitable for hair care. Generally such ingredients are included individually at a level of up to 2%, preferably up to 1%, by weight of the total composition. Among suitable hair care adjuvants, are: (i) natural hair root nutrients, such as amino acids, sugars and vitamins. Examples of suitable amino acids include arginine, cysteine, giutamine, glutamic acid, isoleucine, leucine, methionine, serine and valine, and/or precursors ana derivatives thereof. The amino acids may be added singly, in mixtures, or in the form of peptides, e.g. di- and tripeptides. The amino acids may also be added in the form of a protein hydroiysate, such as a keratin or collagen hydroiysate. Suitable sugars are glucose, dextrose and fructose. These may be added singly or in the form of, e.g. fruit extracts. A particularly preferred combination of natural hair root nutrients for inclusion in compositions of the invention is isoleucine and glucose. A particularly preferred amino acid nutrient is arginine. (ii) hair fibre benefit agents. Examples are: ceramides, for moisturising the fibre and maintaining cuticle integrity. Ceramides are available by extraction from natural sources, or as synthetic ceramides and pseudcceramides. A preferred ceramide is Ceramide II, ex Quest. Mixtures of ceramides may also be suitable, such as Ceramides L3, ex Laboratoires Serobiologiques. fatty acids, for cuticle repair and damage prevention. Examples are branched chain fatty acids such as 1S-methyieicosanoic acid and other homologues of this series, straight chain fatty acids such as stearic, myristic and palmitic acids, and unsaturated fatty acids such as oleic acid, linoleic acid, linolenic acid and arachidonic acid. .-. preferred fatty acid is oleic acid. The fatty acids may be added singly, as mixtures, or in the form of blends derived from extracts of, e.g. lanolin. Mixtures of any of the above active ingredients may also be used. The invention is further illustrated by way of the following non-limitative examples, in. which all-percentages, quoted., are. by weight based on total weight unless otherwise stated: Packaging Compositicns according to the present invention are suitable for packaging in containers made from any material, especially aluminium, tin-plate, and including mixtures or other combinations of these. Tin-plate, is particularly oreferred for aerosol cans for cost reasons. Preferably, for metal containers, the interior surface of the metal container (and the valve, in the case of pressurised metal. cans provided with such) is laminated with a plastic material or coated with a lacquer or with a varnish, to further protect the interior surface from corrosion, preferred materials for lamination and lacquers or varnishes for coating are Micoflex®, epoxyphenolic, PAM, PET, ??, Ferrolite® or a combination thereof. The invention will nov; be further illustrated by the following, non-limiting Examples: EXAMPLES Control Formulation A mousse shampoo base was made up having the following ingredients: Ingredient % (wt) Scdiu.TL laureth sulphate Cocamidopropyl betaine Sodium cocoyl isethionate Silicone Emulsion ex Dow Corning (dimethiconol in anionic surfactant, 25% a.i.) Sodium benzoate DMDM Kydantoin, Iodopropynyl butyicarbamate Guar hydroxypropyltrimonium chloride Perfume PPG-9 Water, minors 17.143 6.67 2.000 6.0000 0.5000 0.2000 0.1000 0.5000 0.0010 q.s. Corrosion Testing Formulations were made up from the control formulation described above, using various corrosion inhibitors, as fellows: Test Formula Formulation Control Control formulation only A Control formulation + 1.0% CRODASINIC® LS30 (Sodium lauryl sarcosinate, ex Croda Chemicals Ltd) B Control formulation +1.0% CRODASINIC® 0 (Oleoyl sarcosine, ex Croda Chemicals Ltd) C Control formulation + 1.0% DEHYQUART® SP (Quaternium-52, ex Kenkel) D Control formulation +1.0% WITCONOL® 14 (Poiyglyceryl-4 oieate, ex Witco) E Control formulation + l.G% 0XA3AN®A (Dimethyl oxazolidone ex Angus Chemie GmbH) The corrosion test involved immersing a valve cup in the test formula and storage testing at 50°C. The valve cup was tin-plate having an epoxypnenolic external lacquer and a 200 micron P? laminate on the interior. The results showed significant corrosion of the valve cup after 2 weeks storage for all :he test formulas except test formula E. The valve cup immersed in -est formula E showed no signs of corrosion even afcer 5 weeks s-orage under the same conditions. A further corrosion test was conducted using the control and test formula E. Steel-based can components having various types of coating were immersed in the test formula and soaked for 3 months at room temperature. The results are shown in the following table: Coding for corrosion results: 5 Perfect - no visible change 4 Some colour change apparent 3 Marked colour change apparent 2 Visible points of corrosion i Obvious corrosion It was noted that in all the tests using the control, the formula became discoloured (rust coloured) and lost viscosity, whereas in ail the tests using test formula E, the test formula did not show discoloration and maintained viscosity. A third test was conducted using a pressurised system. A tin-plate can with a PET laminate body and Ferrolite© components was filled with test formula and charged with propellant (4.0% Drivosol© 2.7, ex Huls). The test formulas used were the control and a test formula F, corresponding to the control formula with the addition of 0.10% OXABAN0A. The cans were stored for 3 months in a horizontal position at 37°C and 50°C respectively. After this period, visual signs of corrosion were seen in one of the components in the presence of the control formula. In contrast, no such change was evident in the presence of test formula F. WE CLAIM: 1. A personal care composition suitable for packaging in a metal can, the composition including a corrosion-inhibiting additive which is a combination of a benzoate salt and an oxazolidine. 2. A composition according to claim 1, in which the level of benzoate salt ranges from 0.01 to 5% by weight based on total weight of the composition. 3. A composition according to claim 1 or 2, in which the benzoate salt is sodium benzoate. 4. A composition according to any one of claims 1 to 3, in which the level of oxazolidine ranges from 0.001 to 5% by weight based on total weight of the composition. 5. A composition according to any one of claims i to 4, in which the oxazolidine is 4,4-dimethyi-l,3-cxazclidir.e. 6. A composition according to any of claims 1 to 5, which is in the form of an aerosol shampoo mousse comprising from 5 to 30% surfactant, by weight based on total weight, and from 20 to 80% water, by weight based on total weight. 7. A composition according to any of claims 1 to 5, which is in the form of a hair stvlir.c composition comprising at least one hair styling polymer. S.' A composition according to any of claims 1 to 7, which is packaged in a tin-plate can.

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