Modified aerosol-generating article with flame retardant wrapper

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;
• 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 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 basis weight greater than the basis weight of the wrapping base material, and
• wherein the treated portion extends over at least about 90 percent of an outer surface area of the rod of aerosol-generating substrate.

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;
• 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 the treated portion extends over at least about 90 percent of an outer surface area of the discrete rod.