Tobacco smoke filter

Details Tobacco smoke filter Tobacco smoke filter

A - Human Necessities

24

D

A24D 3/16 (2006.01) A24D 3/14 (2006.01)

Patent

CA 2504850

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).

L'invention concerne un filtre de fumée du tabac, qui assure une filtration en phase vapeur acceptable et une diffusion d'arôme en présence d'un aromatisant volatil, tel que le menthol. Le filtre de l'invention contient un charbon actif dans lequel: 1) des pores dont le diamètre est inférieur à 2 nm (micropores) présentent un volume poreux d'au plus 0,3 cm?3¿/g (NZ); et 2) a) des pores dont le diamètre est compris entre 2 et 50 nm (mésopores) présentent un volume poreux d'au moins 0,25 cm?3¿/g (N¿2?) et/ou b) des pores dont le diamètre est compris entre 7 et 50 nm (mésopores plus grands) présentent un volume poreux d'au moins 0,12 cm?3¿/g (Hg).

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