Smoking article with heat resistant sheet material

Abstract

A smoking article includes a sheet material including a fibrous layer formed of cellulosic fibres and at least 50% by weight of inorganic filler material having a particle size in range of from 0.1 microns and 50 microns, wherein the sheet material has a tensile strength of at least 900 N/m. The fibrous layer includes a binder material, such as an organic binder material. The organic binder material can be a cellulosic binder material. A coating layer may be provided on at least one side of the fibrous layer.

1 . (canceled) 
     
     
         2 . A heat resistant sheet material for a smoking article, the heat resistant sheet material comprising:
 an inorganic filler material including a plurality of spherical-shaped particles, an average particle size of the plurality of spherical-shaped particles being greater than or equal to 0.1 micrometers to less than or equal to 50 micrometers.   
     
     
         3 . The heat resistant sheet material of  claim 2 , wherein the inorganic filler material includes calcium carbonate (CaCO 3 ), calcium sulphate (CaSO 4 ), aluminum trihydroxide without crystal bound water (Al(OH) 3 ·3H 2 O), aluminum (III) oxide (Al 2 0 3 ), or any combination thereof. 
     
     
         4 . The heat resistant sheet material of  claim 2 , wherein the plurality of spherical-shaped particles have an average particle size greater than or equal to 0.1 micrometers to less than or equal to 30 micrometers. 
     
     
         5 . The heat resistant sheet material of  claim 2 , wherein the plurality of spherical-shaped particles have an average particle size greater than or equal to 0.3 micrometers to less than or equal to 3 micrometers. 
     
     
         6 . The heat resistant sheet material of  claim 2 , further comprising:
 a fibrous layer that includes the inorganic filler material.   
     
     
         7 . The heat resistant sheet material of  claim 6 , wherein the fibrous layer includes the inorganic filler material in an amount greater than or equal to 50% by weight. 
     
     
         8 . The heat resistant sheet material of  claim 6 , further comprising:
 cellulose fibers.   
     
     
         9 . The heat resistant sheet material of  claim 8 , wherein the fibrous layer includes the cellulosic fibers in an amount less than or equal to 40% by weight. 
     
     
         10 . The heat resistant sheet material of  claim 6 , further comprising:
 an organic binder.   
     
     
         11 . The heat resistant sheet material of  claim 10 , wherein the fibrous layer includes the organic binder in an amount greater than or equal to 0.1% to less than or equal to 10% by weight. 
     
     
         12 . The heat resistant sheet material of  claim 10 , wherein the fibrous layer includes the organic binder in an amount greater than or equal to 0.5% to less than or equal to 5% by weight. 
     
     
         13 . The heat resistant sheet material of  claim 10 , wherein the organic binder includes anionic starch, cationic starch, guar gum, xanthan gum, casein, polyvinyl alcohol, or any combination thereof. 
     
     
         14 . The heat resistant sheet material of  claim 6 , further comprising:
 a processing aid.   
     
     
         15 . The heat resistant sheet material of  claim 14 , wherein the fibrous layer includes the processing aid in an amount less than or equal to 0.5% by weight. 
     
     
         16 . The heat resistant sheet material of  claim 14 , wherein the processing aid includes flocculants, coagulants, or both flocculants and coagulants. 
     
     
         17 . The heat resistant sheet material of  claim 6 , further comprising:
 a coating layer at least partially covering at least one side of the fibrous layer.   
     
     
         18 . The heat resistant sheet material of  claim 17 , wherein
 the fibrous layer has a weight greater than or equal to 70 grams per square meter to less than or equal to 130 grams per square meter; and   the coating layer has a weight of 5 grams per square meter to 75 grams per square meter.   
     
     
         19 . The heat resistant sheet material of  claim 17 , wherein
 the inorganic filler material is a first inorganic filler material, and   the coating layer includes a second inorganic filler material and.   
     
     
         20 . The heat resistant sheet material of  claim 17 , wherein the coating layer includes an organic binder. 
     
     
         21 . The heat resistant sheet material of  claim 17 , wherein
 the coating layer is a first coating layer at least partially covering a first side of the fibrous layer, and   the heat resistant sheet material further comprises:
 a second coating layer at least partially covering a second side of the fibrous layer.