(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date WO 2017/080945 Al 18 May 20 17 (18.05.2017) W P O P C T (51) International Patent Classification: (GB). HUNTER, Karl, John; Unilever R&D Colworth A61Q 15/00 (2006.01) A61K 8/27 (2006.01) Sharnbrook, Bedford, Bedfordshire MK44 1LQ (GB). A61K 8/73 (2006.01) A61K 8/23 (2006.01) (74) Agent: WARNER, Guy, Jonathan; Unilever PLC, Uni A61K 8/20 (2006.01) A61K 8/19 (2006.01) lever Patent Group, Colworth House, Sharnbrook, Bedford A61K 8/26 (2006.01) Bedfordshire MK44 1LQ (GB). (21) International Application Number: (81) Designated States (unless otherwise indicated, for every PCT/EP20 16/076807 kind of national protection available): AE, AG, AL, AM, (22) International Filing Date: AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, 7 November 2016 (07.1 1.2016) BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, (25) Filing Language: English HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, (26) Publication Language: English KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, (30) Priority Data: OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, 15 193578.0 9 November 2015 (09. 11.2015) EP SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, (71) Applicant (for AE, AG, AU, BB, BH, BN, BW, BZ, CA, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, CY, EG, GB, GD, GH, GM, IE, IL, IN, KE, KN, KW, LC, ZW. LK, LS, MT, MW, MY, NA, NG, NZ, OM, PG, QA, RW, SA, (84) Designated States (unless otherwise indicated, for every SC, SD, SG, SL, SZ, TT, TZ, UG, VC, ZA, ZM, Z W only): kind of regional protection available): ARIPO (BW, GH, UNILEVER PLC [GB/GB]; a company registered in Eng GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, land and Wales under company no. 41424 of Unilever TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, House, 100 Victoria Embankment, London Greater Lon TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, don EC4Y 0DY (GB). DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, (71) Applicant (for all designated States except AE, AG, AU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, BB, BH, BN, BW, BZ, CA, CY, EG, GB, GD, GH, GM, IE, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, IL, IN, KE, KN, KW, LC, LK, LS, LT, MT, MW, MY, NA, GW, KM, ML, MR, NE, SN, TD, TG). NG, NZ, OM, PG, QA, RW, SA, SC, SD, SG, SL, SZ, TT, Declarations under Rule 4.17 : TZ, UG, US, VC, ZA, ZM, ZW): UNILEVER N.V. [NL/NL]; Weena 455, 301 3 AL Rotterdam (NL). — as to applicant's entitlement to apply for and be granted a patent (Rule 4.1 7(H)) (71) Applicant (for US only): CONOPCO, INC., D/B/A UNI¬ — as to the applicant's entitlement to claim the priority of the LEVER [US/US]; 800 Sylvan Avenue AG West, S. Wing, earlier application (Rule 4.1 7(in)) Englewood Cliffs, NJ 07632 (US). — of inventorship (Rule 4.17(iv)) (72) Inventors: BERRY, Mark, John; Unilever R&D Col- worth Sharnbrook, Bedford, Bedfordshire MK44 1LQ Published: (GB). CHANDLER, Ian, Christopher; Unilever R&D — with international search report (Art. 21(3)) Colworth Sharnbrook, Bedford, Bedfordshire MK44 1LQ © o00 © (54) Title: ANTI-PERSPIRANT COMPOSITION (57) Abstract: An anti-perspirant composition comprising: (a) chitosan or a salt thereof, with a weight average molecular weight of greater than 80 kDa; and (b) an alumimum, zinc, magnesium or copper salt or mixture thereof wherein the composition comprises less than 3 wt% of alumimum salt. ANTI-PERSPIRANT COMPOSITION Field of the invention The invention relates to an anti-perspirant composition that contains low or no aluminium salt. Background of the invention Current anti-perspirant ingredients are based on aluminium, but inorganic salts have the effect of leaving white patches on clothes. Additionally there is a perceived health risk associated with aluminium. The current approach is to reduce the amount of aluminium in antiperspirants or to use additional metal salts such as those of zirconium. However, this approach tends to lower the efficacy of the formulation and hence prove more expensive. Zirconium-based antiperspirants tend to leave yellow patches on clothes. US 2009/0016978 A 1 (Courtois et al.) describes an antiperspirant composition comprising a carrier substance and a water-soluble or water-dispersible thiolated polymer. The prior art inventors believe that the thiol groups of the thiomer enable or enhance the polymer's ability to act as a mucoadhesive and that this ability enables or enhances the antiperspirant activity of the thiomer. "Mucoadhesives" are materials that can attach to mucin in a biological surface. The prior art inventors further believe that the antiperspirant activity results, at least in part, from the ability of the thiomers to act as pore blockers. The thiomers, when swollen by water, are thought to serve to as plugs that may, at least in part, block the exit of sweat from eccrine sweat glands. It is essential for the invention that the thiomer is water-soluble or water-dispersible in order for it to dissolve or disperse in eccrine sweat. WO 03/042251 (The Procter & Gamble Company) discloses compositions comprising chitosan in the form of a network of nano-sized fibres. Traditional chitosan is usually semi-crystalline and only soluble in acidic medium, typically in a pH range of from 1 to 5 limiting homogeneous formulation. A process for producing the network of nano- sized fibres is described involving the steps of forming an aqueous solution, neutralising the chitosan just to the point of precipitation, and homogenising the resulting suspension. It was observed that the minimum concentration of chitosan to inhibit Malassezia furfur (yeast implicated in dandruff) was lower than expected. This document also discloses an anti-dandruff composition comprising from about 0.01 % to about 5 % , preferably from about 0.5 % to about 2 % of chitosan by weight of the composition as the active anti-dandruff agent. The chitosan can be used in different applications, such as hair care, skin care, personal cleansing, odour control, wound care, blood management, oral care, film formation, controlled release of hydrophobic or hydrophilic materials, hard surface, fabric treatment, plant care, seed, grain, fruit and food protection, water purification and drug delivery. The chitosan compositions provide hair care benefits when formulated into products such as shampoos, conditioners, hairsprays, styling mousses and gels, hair tonics and hair colorants, especially anti-dandruff benefits and reduction of hair damage caused by the process of hair bleaching, permanent waving or coloration. Additionally, the compositions provide scalp benefits and conditioning properties such as softening, manageability and stylising of the hair. Specific examples are a shampoo, a conditioner, a dentifrice, a mouthwash, a non-abrasive gel, a chewing gum and a plant care composition. WO 2006/040092 (Beiersdorf AG) discloses an aerosol formulation comprising one or more anti-perspirants and/or deodorising substances and chitosan having a degree of deacetylation of 75 to 98 % , a viscosity of 5 to 10 mPas, a weight average molecular weight distribution of less than 300 000 Da and a number average molecular weight distribution of less than 100 000 Da. It appears that the disclosed chitosan preserves the skin flora rather than acting purely as a bacteriocide. In particular, the chitosan appears to bind to the bacteria preventing microbial decomposition of sweat leading to odour. Anti-perspirants reduce sweat formation with the aid of astringent compounds in them, which are predominantly aluminium salts, such as aluminium hydrochloride, activated aluminium chlorohydrate or aluminium zirconium. It is customary to combine astringents with antimicrobials in the same composition. Aerosol products generally contain active anti-perspirant substances in the form of solids, which are suspended in an oil phase. Conventional active deodorant substances include ethyl hexyl glycerol, methyl phenyl butanol and polyglyceryl-2-caprate. One aim of the invention described in WO 2006/040092 is to reduce whiteness on skin or clothes. The formulation comprises 0.001-2, preferably 0.01-1 , especially 0.015-0.3 % w/w chitosan. The formulation comprises 1-35, preferably 1-25, especially 1-20 % w/w anti-perspirant component. The formulation comprises preferably 0.01-10, especially 0.05-5 % w/w deodorant component. Examples disclosed are anhydrous compositions. WO 2006/040092 further discloses that the pressure container used for the aerosol can be made of a metal, protected glass, non-shatter glass or some other glass, or else of a plastic. The propellant gas is preferably chosen from a long list of suitable gases. US 2003/0133891 (Cognis Corporation) discloses a deodorising preparation containing nanoscale chitosans and/or chitosan derivatives with a particle diameter in the range from 10 to 300 nm. Chitosans have a bacteriostatic effect and a synergistic deodorising effect with esterase inhibitors and aluminium chlorohydrates. It is disclosed that absorption of nanoscale chitosans and/or chitosan derivatives by the Stratum Corneum is increased leading to long-lasting deodorising effect. The chitosan is normally used at levels of 0.01-5, preferably 0.1-1 , more particularly 0.2-0.6 % w/w.