Tobacco smoke filter
AssigneeFiltrona International Limited
InventorAnthony McCormack
Life of this patent
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Abstract
A tobacco smoke filter which gives acceptable vapour phase filtration and flavour delivery in the presence of volatile flavourant (e.g. menthol), the filter containing activated carbon in which (1) pores of under 2 nm pore diameter (micropores) provide a pore volume of at most 0.3 cm3/g (NZ); and (2) (a) pores of 2 to 50 nm pore diameter (mesopores) provide a pore volume of at least 0.25 cm3/g (N2) and/or (b) pores of 7 to 50 nm diameter (larger mesopores) provide a pore volume of at least 0.12 cm3/g (Hg).
Claims14
A tobacco smoke filter containing activated carbon which carbon has a micropore volume provided by micropores of under 2 nm pore diameter, said micropore volume being at most 0.3 cm3/g (N2), and in which carbon mesopores of 2 to 50 nm pore diameter provide a mesopore volume of at least 0.25 cm3/g (N2).
A tobacco smoke filter containing activated carbon which carbon has a micropore volume provided by micropores of under 2 nm pore diameter, said micropore volume being at most 0.3 cm3/g (N2), and in which carbon mesopores of 7 to 50 nm pore diameter provide a mesopore volume of at least 0.12 cm3/g (Hg).
Dependencies are inferred from the claim text.