# US 11,998,040 B2 · Non-combustible wrapper for use in heat but not burn applications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,040 B2 - Document ID: US11998040B2 - Status: Granted - Kind: B2 - Application number: 17/224,783 - Filed: 2021-04-07 - Published: 2021-10-07 - Granted: 2024-06-04 - Earliest claimed: 2020-04-07 - Assignees: SWM Holdings US, LLC - Applicants: Schweitzer-Mauduit International, Inc. - Inventors: Bruno Stefani; Lanig Le Bec - Web page: https://patentgrep.com/patent/US11998040B2 ## CPC - A24D 1/025: {the covers having material applied to defined areas, e.g. bands for reducing the ignition propensity} - A24D 1/20: Cigarettes specially adapted for simulated smoking devices - A24D 1/02: with special covers - D21H 17/675: {Oxides, hydroxides or carbonates} - D21H 17/68: siliceous, e.g. clays - D21H 19/10: Coatings without pigments (D21H19/66 takes precedence) - D21H 21/34: Ignifugeants - D21H 21/52: Additives of definite length or shape - A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR ## Abstract A paper well suited for use as a wrapper in heat but not burn sticks is disclosed. The paper includes a base web made from cellulosic fibers combined with a flame retardant filler and/or can include a coating formed from a reduced ignition composition. ## Claims ### Claim 1 A wrapper for a heat but not burn stick comprising: a base web comprising cellulosic fibers combined with a flame retardant filler, the base web having a first side and a second and opposite side, the flame retardant filler comprising metal silicate particles, the metal silicate particles comprising greater than about 15% by weight of the base web and comprising less than 35% by weight of the base web; and a coating disposed on the first side of the base web, the coating comprising a reduced ignition composition. ### Claim 2 (depends on 1) A wrapper as defined in claim 1, wherein the metal silicate particles are uncoated and wherein the metal silicate particles have an average particle size of from about 0.1 microns to about 30 microns. ### Claim 3 (depends on 1) A wrapper as defined in claim 1, wherein the base web has an inherent permeability of from about 0 CU to about 20 CU, wherein the base web has a basis weight of from about 12 gsm to about 100 gsm, wherein the coating has a basis weight of less than 5 gsm. ### Claim 4 (depends on 1) A wrapper as defined in claim 1, wherein the coating of the reduced ignition composition is continuous, the first side of the base web having a surface area and wherein the coating covers greater than about 80% of the surface area of the first side of the base web. ### Claim 5 (depends on 1) A wrapper as defined in claim 1, wherein the wrapper is a single layer wrapper. ### Claim 6 (depends on 1) A wrapper as defined in claim 1, wherein the wrapper includes a plurality of layers, the base web comprising one of the layers. ### Claim 7 A wrapper for a heat but not burn stick comprising: a base web comprising cellulosic fibers combined with a flame retardant filler, the base web having a first side and a second and opposite side, the flame retardant filler comprising kaolin particles or metal hydroxide particles comprising greater than about 15% by weight of the base web and comprising less than 35% by weight of the base web; and a coating disposed on the first side of the base web, the coating comprising a reduced ignition composition. ### Claim 8 (depends on 7) A wrapper as defined in claim 7, wherein the flame retardant filler particles comprise aluminum hydroxide particles. ### Claim 9 (depends on 7) A wrapper as defined in claim 7, wherein the flame retardant filler particles comprise kaolin particles. ### Claim 10 (depends on 7) A wrapper as defined in claim 7, wherein the base web has an inherent permeability of from about 0 CU to about 20 CU, wherein the base web has a basis weight of from about 30 gsm to about 100 gsm, wherein the coating has a basis weight of less than 5 gsm. ### Claim 11 (depends on 7) A wrapper as defined in claim 7, wherein the coating of the reduced ignition composition is continuous, the first side of the base web having a surface area and wherein the coating covers greater than about 80% of the surface area of the first side of the base web. ### Claim 12 (depends on 7) A wrapper as defined in claim 7, wherein the reduced ignition composition comprises an alginate, a starch or mixtures thereof. ### Claim 13 (depends on 7) A wrapper as defined in claim 7, wherein the wrapper is a single layer wrapper. ### Claim 14 (depends on 7) A wrapper as defined in claim 7, wherein the wrapper includes a plurality of layers, the base web comprising one of the layers. ### Claim 15 (depends on 7) A heat but not burn stick comprising: a column of an aerosol generating material; and a wrapper as defined in claim 7, the wrapper surrounding the column of the aerosol generating material. ### Claim 16 (depends on 15) A heat but not burn stick as defined in claim 15, wherein the aerosol generating material comprises a tobacco. ### Claim 17 A wrapper for a heat but not burn stick comprising: a base web comprising cellulosic fibers, the base web having a first side and a second and opposite side; and a continuous coating disposed on the first side of the base web, the coating comprising a reduced ignition composition, the reduced ignition composition comprising a polymer material, a cellulose material, or mixtures thereof, the base web having a permeability where coated with the reduced ignition composition of less than about 5 CU and having a diffusivity of less than 0.04 cm/s as determined by a CO2 diffusivity tester, the first side of the base web having a surface area and wherein the reduced ignition composition covers greater than about 40% of the surface area of the first side of the base web. ### Claim 18 (depends on 17) A wrapper as defined in claim 17, wherein the reduced ignition composition comprises an alginate, a starch, or mixtures thereof. ### Claim 19 (depends on 17) A wrapper as defined in claim 17, wherein the reduced ignition composition covers greater than about 80% of the surface area of the first side of the base web. ### Claim 20 (depends on 17) A wrapper as defined in claim 17, wherein the base web further contains flame retardant filler particles in an amount from about 10% to about 40% by weight. ### Claim 21 (depends on 17) A wrapper as defined in claim 17, wherein the base web does not contain any filler particles. ### Claim 22 (depends on 1) The wrapper as defined in claim 1, wherein the base web is formed from an aqueous suspension including the cellulosic fibers and the flame retardant filler. ### Claim 23 (depends on 1) The wrapper as defined in claim 1, wherein the base web has a basis weight of less than 35 gsm.