Aerosol-generating article filter having novel filtration material

Abstract

An aerosol-generating article is provided, including: an aerosol-generating substrate; and a filter in axial alignment with the aerosol-generating substrate, the filter including at least one filter segment of filtration material formed of a plurality of fibres including a polyhydroxyalkanoate compound, in which the fibres provide a total external surface area within the filter segment of between 0.12 square metres per gram and 0.28 square metres per gram, and in which the at least one filter segment includes at least 20 percent by weight of the polyhydroxyalkanoate compound. A filter for an aerosol-generating article is also provided.

1 .- 14 . (canceled) 
     
     
         15 . An aerosol-generating article, comprising:
 an aerosol-generating substrate; and   a filter in axial alignment with the aerosol-generating substrate, the filter comprising at least one filter segment of filtration material formed of a plurality of fibres comprising a polyhydroxyalkanoate compound,   wherein the fibres provide a total external surface area within the filter segment of between 0.12 square metres per gram and 0.28 square metres per gram, and   wherein the at least one filter segment comprises at least 20 percent by weight of the polyhydroxyalkanoate compound.   
     
     
         16 . The aerosol-generating article according to  claim 15 , wherein the plurality of fibres have a round cross-sectional shape and provide a total external surface area within the at least one filter segment of between 0.12 square meters per gram and 0.16 square meters per gram. 
     
     
         17 . The aerosol-generating article according to  claim 15 , wherein the plurality of fibres have a Y-shaped cross-sectional shape and provide a total external surface area within the at least one filter segment of between 0.21 square meters per gram and 0.28 square meters per gram. 
     
     
         18 . The aerosol-generating article according to  claim 15 , wherein the fibres have a denier per filament (dpf) of between 3.2 dpf and 5.0 dpf. 
     
     
         19 . The aerosol-generating article according to  claim 15 , wherein a total denier of the fibres is between 25,000 and 40,000. 
     
     
         20 . The aerosol-generating article according to  claim 15 , wherein the filtration material further comprises a plurality of fibres of at least one additional, biodegradable polymer. 
     
     
         21 . The aerosol-generating article according to  claim 15 , wherein a resistance to draw (RTD) of the at least one filter segment is between 10 millimetres H 2 O to about 40 millimetres H 2 O. 
     
     
         22 . The aerosol-generating article according to  claim 15 , wherein the at least one filter segment has a biodegradability in an aqueous medium of at least 50 percent when tested according to ISO 14851. 
     
     
         23 . The aerosol-generating article according to  claim 15 , wherein the at least one filter segment further comprises at least 5 percent by weight of polyethylene glycol. 
     
     
         24 . The aerosol-generating article according to  claim 15 , where the at least one filter segment has an average radial hardness of at least 80 percent. 
     
     
         25 . The aerosol-generating article according to  claim 15 , wherein the at least one filter segment is circumscribed by a wrapper having a basis weight of at least 100 grams per square metre (gsm). 
     
     
         26 . The aerosol-generating article according to  claim 15 , wherein the at least one filter segment is in the form of a hollow tubular element. 
     
     
         27 . The aerosol-generating article according to  claim 15 , wherein the aerosol-generating substrate is a rod of tobacco having a length of between 5 millimetres and 15 millimetres. 
     
     
         28 . A filter for an aerosol-generating article, the filter comprising:
 at least one filter segment of filtration material formed of a plurality of fibres comprising a polyhydroxyalkanoate compound,   wherein the fibres provide a total external surface area within the at least one filter segment of between 0.12 square metres per gram and about 0.28 square metres per gram, and   wherein the at least one filter segment comprises at least about 20 percent by weight of the polyhydroxyalkanoate compound.