Covering material for smoking products having improved carbon monoxide reducing properties

Abstract

The smoking article wrapping material contains calcium carbonates of differing particle size as a filler, one of the calcium carbonates having a particle size in the range from 0.1 to 2 μm and being present in an amount of 51-99%, based on the total content of calcium carbonate fillers, and another calcium carbonate having a particle size of 3.5-10 μm and being present in an amount of 1-49%, based on the total content of calcium carbonate fillers.

1 - 8 . (canceled) 
   
   
       9 . A smoking article wrapping material comprising calcium carbonates of differing particle size as a filler, a first of the calcium carbonates having a particle size in a range from 0.1 to 2 μm and being present in an amount of 51-99% based on a total content of the calcium carbonates, and a second of the calcium carbonates having a particle size of from 3.5-10 μm and being present in an amount of 1-49% based on the total content of the calcium carbonates. 
   
   
       10 . The smoking article wrapping material according to  claim 9  comprising a cigarette paper. 
   
   
       11 . The smoking article wrapping material according to  claim 9 , wherein the first of the calcium carbonates has a particle size in a range from 0.3 to 1 μm and is present in an amount of 70-95% based on the total content of the calcium carbonates, and the second of the calcium carbonates has a particle size of 4-6 μm and is present in an amount of 5-30% based on the total content of said calcium carbonates. 
   
   
       12 . The smoking article wrapping material according to  claim 10 , wherein the first of the calcium carbonates has a particle size in a range from 0.3 to 1 μm and is present in an amount of 70-95% based on the total content of the calcium carbonates, and the second of the calcium carbonates has a particle size of 4-6 μm and is present in an amount of 5-30% based on the total content of said calcium carbonates. 
   
   
       13 . The smoking article wrapping material according to  claim 9 , wherein the total filler content is 10-50% based on the total weight of the smoking article wrapping material. 
   
   
       14 . The smoking article wrapping material according to  claim 10 , wherein the total filler content is 10-50% based on the total weight of the smoking article wrapping material. 
   
   
       15 . The smoking article wrapping material according to  claim 13 , wherein the total content of the calcium carbonates is from 25% to 40%. 
   
   
       16 . The smoking article wrapping material according to  claim 9 , further comprising at least one additional filler selected from the group consisting of calcium carbonate having a particle size different from said particle size of said first calcium carbonates and said second of the calcium carbonates, titanium dioxide, magnesium oxide, kaolin and/or talc. 
   
   
       17 . A method of reducing a carbon monoxide fraction in smoke from a smoking article, said method comprising incorporating in a smoking article wrapping material, while preserving air permeability of the smoking article wrapping material, calcium carbonate fillers of differing particle size in an operative mixing ratio, a first of the calcium carbonate fillers having a particle size in a range from 0.1 to 2 μm and being incorporated in an amount of 51 to 99% based on a total content of the calcium carbonate fillers, and a second of said calcium carbonate fillers having a particle size in a range from 3.5 to 10 μm and being incorporated in an amount of 1 to 49% based on the total content of the calcium carbonate fillers. 
   
   
       18 . A smoking article comprising a tobacco rod, a smoking article wrapping material according to  claim 9 ,  10 ,  11 ,  12 ,  13 ,  14 ,  15  or  16  and, optionally, a filter.