Aerosol-generating article with combustion preventing wrapper

Abstract

An aerosol-generating article is provided for producing an inhalable aerosol upon heating, the article including: a rod of aerosol-generating substrate extending from a rod proximal end to a rod distal end upstream from the proximal end, the substrate an aerosol-former, an aerosol former content of the substrate being at least 10 percent on a dry weight basis; a downstream section located downstream of the rod; and a wrapper circumscribing the rod, the wrapper including a wrapping base material having a dry basis weight, in which a treated portion of the wrapper extending between the proximal and distal ends includes a flame retardant composition including flame retardant compounds, such that the treated portion has an overall dry basis weight greater than that of the wrapping base material, and in which the treated portion includes at least about 2 g/m2 of the flame retardant compounds of surface area of the treated portion.

1 - 18 . (canceled) 
     
     
         19 . An aerosol-generating article for producing an inhalable aerosol upon heating, the aerosol-generating article comprising:
 a rod of aerosol-generating substrate extending from a rod proximal end to a rod distal end upstream from the rod proximal end, wherein the aerosol-generating substrate comprises at least an aerosol-former, an aerosol former content of the aerosol-generating substrate being at least 10 percent on a dry weight basis;   a downstream section at a location downstream of the rod of aerosol-generating substrate; and   a wrapper circumscribing at least the rod of aerosol-generating substrate, the wrapper comprising a wrapping base material having a dry basis weight,   wherein at least a treated portion of the wrapper extending between the rod proximal end and the rod distal end comprises a flame retardant composition comprising one or more flame retardant compounds, such that the treated portion of the wrapper has an overall dry basis weight greater than a dry basis weight of the wrapping base material, and   wherein the treated portion comprises at least about 2 grams of the one or more flame retardant compounds per square meter of surface area of the treated portion.   
     
     
         20 . The aerosol-generating article according to  claim 19 , wherein the treated portion further comprises at least about 3 grams of the one or more flame retardant compounds per square meter of surface area of the treated portion. 
     
     
         21 . The aerosol-generating article according to  claim 19 , wherein the treated portion further comprises less than or equal to about 12 grams of the one or more flame retardant compounds per square meter of surface area of the treated portion. 
     
     
         22 . The aerosol-generating article according to  claim 19 , wherein the dry basis weight of the wrapping base material is at least about 20 grams per square meter. 
     
     
         23 . The aerosol-generating article according to  claim 19 , wherein the dry basis weight of the wrapping base material is less than or equal to about 40 grams per square meter. 
     
     
         24 . The aerosol-generating article according to  claim 19 , wherein the treated portion extends over at least about 90 percent of an outer surface area of the rod of aerosol-generating substrate. 
     
     
         25 . The aerosol-generating article according to  claim 19 , wherein a length of the treated portion is at least about 90 percent of a length of the rod of aerosol-generating substrate. 
     
     
         26 . The aerosol-generating article according to  claim 19 , wherein the wrapper further comprises a layer comprising the flame retardant composition provided on a surface of the wrapping base material facing the aerosol-generating substrate, a surface of the wrapping base material facing away from the aerosol-generating substrate, or both. 
     
     
         27 . The aerosol-generating article according to  claim 19 , wherein the flame retardant composition further comprises a polymer and a mixed salt based on at least one mono, di- and/or tri-carboxylic acid, at least one polyphosphoric, pyrophosphoric, and/or phosphoric acid, and a hydroxide or a salt of an alkali or an alkaline earth metal, where the at least one mono, di- and/or tri-carboxylic acid and the hydroxide or salt form a carboxylate and the at least one polyphosphoric, pyrophosphoric, and/or phosphoric acid and the hydroxide or salt form a phosphate. 
     
     
         28 . The aerosol-generating article according to  claim 27 , wherein the flame retardant composition further comprises a carbonate of an alkali or an alkaline earth metal. 
     
     
         29 . The aerosol-generating article according to  claim 19 , wherein the flame retardant composition further comprises cellulose modified with at least one C 10  or higher fatty acid, tall oil fatty acid (TOFA), phosphorylated linseed oil, phosphorylated downstream corn oil. 
     
     
         30 . The aerosol-generating article according to  claim 19 , wherein the wrapper does not comprise metal. 
     
     
         31 . The aerosol-generating article according to  claim 19 , wherein the rod of aerosol-generating substrate has a length of less than about 40 millimeters. 
     
     
         32 . The aerosol-generating article according to  claim 19 , wherein the rod of aerosol-generating substrate comprises a gathered sheet of homogenised tobacco material or a gel composition, the gel composition comprising at least one gelling agent, at least one of an alkaloid compound and a cannabinoid compound, and an aerosol former. 
     
     
         33 . The aerosol-generating article according to  claim 19 , wherein the rod of aerosol-generating substrate further comprises a susceptor element arranged within the aerosol-generating substrate. 
     
     
         34 . A method of manufacturing an aerosol-generating article for generating an inhalable aerosol upon heating, the method comprising:
 providing a continuous rod of aerosol-generating substrate, an aerosol former content of the aerosol-generating substrate being at least 10 percent on a dry weight basis;   circumscribing the continuous rod of aerosol-generating substrate with a wrapper, the wrapper comprising a wrapping base material having a dry basis weight;   treating at least a portion of the wrapper with a flame retardant composition comprising one or more flame retardant compounds, so as to provide a treated portion of the wrapper having an overall dry basis weight greater than the dry basis weight of the wrapping base material; and   cutting the treated wrapped continuous rod of aerosol-generating substrate into discrete rods, each discrete rod extending from a discrete rod proximal end to a discrete rod distal end upstream from the discrete rod proximal end, such that in each discrete rod a treated portion of the wrapper comprises at least about 2 grams of the one or more flame retardant compounds per square meter of surface area of the treated portion.   
     
     
         35 . The method according to  claim 34 , wherein a layer of the flame retardant composition is applied onto at least one side of the wrapping base material by an application process based on size pressing, spraying, printing, or coating. 
     
     
         36 . An aerosol-generating system comprising an electrically operated aerosol-generating device and an aerosol-generating article according to  claim 19 , the electrically operated aerosol-generating device comprising means for heating the rod of aerosol-generating substrate to a temperature sufficient to generate an aerosol from the aerosol-generating substrate.