# US 11,896,695 B2 · Cosmetic compositions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,695 B2 - Document ID: US11896695B2 - Status: Granted - Kind: B2 - Application number: 17/268,225 - Filed: 2019-08-05 - Published: 2021-06-03 - Granted: 2024-02-13 - Earliest claimed: 2018-08-15 - Assignees: The Boots Company PLC - Applicants: The Boots Company PLC - Inventors: Jake Thomas Hicks; Marco Demurtas; Christopher John Elms; Paul James Tomlinson; Michael David Bell - Web page: https://patentgrep.com/patent/US11896695B2 ## CPC - A61K 8/365: Hydroxycarboxylic acids; Ketocarboxylic acids - A61K 8/062: {Oil-in-water emulsions} - A61K 8/361: {Carboxylic acids having more than seven carbon atoms in an unbroken chain; Salts or anhydrides thereof} - A61K 8/4993: {Derivatives containing from 2 to 10 oxyalkylene groups} - A61K 8/73: Polysaccharides - A61K 8/81: obtained by reactions involving only carbon-to-carbon unsaturated bonds - A61K 8/86: Polyethers - A61K 8/88: Polyamides - A61Q 19/00: Preparations for care of the skin - A61Q 19/08: Anti-ageing preparations - A61Q 19/10: Washing or bathing preparations - A61K 2800/54: Polymers characterized by specific structures/properties - A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D) - A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS ## Abstract According to the present invention there is provided composition in the form of an oil-in-water emulsion having a viscosity of between 15,000 cP (15 Pa-s) and 45,000 cP (45 Pa-s) at 23° C., having a pH of between 2 and 6 and comprising: (i) at least 1.6 wt. % of at least one cross-linked anionic polyelectrolyte resulting from the polymerisation of partially or completely salified 2-methyl 2-[(1-oxo 2-propenyl)amino]1-propane sulfonic acid, with at least one neutral monomer chosen from the N,N-dialkyl acrylamides, wherein each of the alkyl groups comprises between one and four carbon atoms, and at least one monomer of formula (B): wherein R represents a linear or branched alkyl radical comprising eight to twenty carbon atoms and n represents a number greater than or equal to one and less than or equal to twenty, in the presence of at least one cross-linking agent; (ii) at least 4 wt. % of at least one polysorbate; (iii) at least 0.1 wt. % of at least one polysaccharide gum; and (iv) between 6 wt. % and 30 wt. % water. The present invention also provides a composition as defined above obtainable by a process comprising the following steps: (a) in one vessel, homogenising the polysaccharide gum (iii) into the aqueous phase comprising the water at a temperature of between 60° C. and 90° C.; (b) in a vessel separate from that in (a), homogenising the cross-linked anionic polyelectrolyte (i) and the polysorbate (ii) into the oil phase at a temperature of between 60° C. and 90° C.; and (c) combining the ingredients of (a) with the ingredients of (b) through homogenisation at a temperature of between 60° C. and 90° C. ## Claims ### Claim 1 A composition in the form of an oil-in-water emulsion having a viscosity of between 15 Pa·s and 45 Pa·s at 23° C., having a pH of between 2 and 6 and comprising (i) at least 1.6 wt. % of at least one cross-linked anionic polyelectrolyte resulting from the polymerisation of partially or completely salified 2-methyl 2-[(1-oxo 2-propenyl)amino] 1-propane sulfonic acid, with at least one neutral monomer chosen from N,N-dialkyl acrylamides, wherein each of the alkyl groups comprises between one and four carbon atoms, and at least one monomer of formula (B): wherein R represents a linear or branched alkyl radical comprising eight to twenty carbon atoms and n represents a number greater than or equal to one and less than or equal to twenty, in the presence of at least one cross-linking agent; (ii) at least 4 wt. % of at least one polysorbate; (iii) at least 0.1 wt. % of at least one polysaccharide gum; and (iv) between 6 wt. % and 30 wt. % water. ### Claim 2 (depends on 1) The composition of claim 1, wherein the composition has a pH of between 3 and 5. ### Claim 3 (depends on 1) The composition of claim 1, wherein the fatty acid associated with the polyoxyethylene sorbitan part of the polysorbate comprises between sixteen and eighteen carbon atoms. ### Claim 4 (depends on 1) The composition of claim 1, wherein the at least one polysorbate is present at a concentration of between 4 wt. % and 20 wt. %. ### Claim 5 (depends on 1) The composition of claim 1, wherein the polysaccharide gum is uncharged. ### Claim 6 (depends on 1) The composition of claim 1, wherein the at least one polysaccharide gum is present at a concentration of between 0.01 wt. % and 1 wt. %. ### Claim 7 (depends on 1) The composition of claim 1, wherein water is present at a concentration of between 10 wt. % and 28 wt. %. ### Claim 8 (depends on 1) The composition of claim 1, wherein the neutral monomer of the at least one cross-linked anionic polyelectrolyte is N,N-dimethyl acrylamide, acrylamide or (2-hydroxy-ethyl) acrylate. ### Claim 9 (depends on 1) The composition of claim 1, wherein in formula (B), R represents an alkyl radical having between 12 and 18 carbon atoms. ### Claim 10 (depends on 1) The composition of claim 1, wherein the at least one polyelectrolyte is present at a concentration of between 1.6 wt. % and 4 wt. %. ### Claim 11 (depends on 1) The composition of claim 1, wherein the composition has a viscosity of between 17 Pa·s and 45 Pa·s. ### Claim 12 (depends on 1) The composition of claim 1, wherein the composition further comprises a mild acid suitable for exfoliating the skin. ### Claim 13 (depends on 12) The composition of claim 12, wherein the mild acid is selected from the list comprising glycolic acid, lactic acid, citric acid, malic acid, tartaric acid and combinations thereof. ### Claim 14 (depends on 1) The composition of claim 1 obtainable by a process comprising the following steps: (a) in one vessel, homogenising the polysaccharide gum (iii) into the aqueous phase comprising the water at a temperature of between 60° C. and 90° C.; (b) in a vessel separate from that in (a), homogenising the cross-linked anionic polyelectrolyte (i) and the polysorbate (ii) into the oil phase at a temperature of between 60° C. and 90° C.; and (c) combining the ingredients of (a) with the ingredients of (b) through homogenisation at a temperature of between 60° C. and 90° C. ### Claim 15 (depends on 1) The composition of claim 1, wherein the composition has a pH of between 3.4 and 4.5. ### Claim 16 (depends on 3) The composition of claim 3, wherein the fatty acid is saturated. ### Claim 17 (depends on 1) The composition of claim 1, wherein the at least one polysorbate is present at a concentration of between 6 wt. % and 10 wt. %. ### Claim 18 (depends on 1) The composition of claim 1, wherein the polysaccharide gum is xanthan gum. ### Claim 19 (depends on 1) The composition of claim 1, wherein the at least one polysaccharide gum is present at a concentration of between 0.1 wt. % and 0.5 wt. %.