Additive releasing materials
AssigneeBritish American Tobacco (Investments) Limited
InventorPeter Branton
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Abstract
The invention relates to an additive releasing material comprising a carrier material having on its surface one or more additives, the additive releasing material having a desorption temperature selected to allow controlled temperature-dependent release of the additive(s). The invention further relates to filters and smoking articles including such additive releasing materials, and to methods for preparing the additive releasing materials.
Claims15
A smoking article filter comprising an additive releasing material, the additive releasing material comprising a porous carrier material having adsorbed on its surface one or more additives, the additive releasing material having a desorption temperature from about 45° C. to about 70° C. such that the additive(s) is (are) released by desorption only after the first 5 to 6 puffs during use of the smoking article, wherein from 10% to 90% of the total pore volume of the porous carrier material is filled with the additive(s), and wherein the additive releasing material comprises at least 30% additive by weight, wherein the additive or at least one of the additives has a molecular weight of 50 to 100 g/mol.
A smoking article filter comprising an additive releasing material, the additive releasing material comprising a porous carrier material having adsorbed on its surface one or more additives, wherein from 10% to 90% of the total pore volume of the porous carrier material is filled with the additive(s), and wherein the additive(s) and/or an amount thereof added to the porous carrier material are selected to provide the additive releasing material with a desorption temperature at which the additive(s) is (are) released from the surface of the porous carrier material of from about 45° C. to about 70° C. during use of the smoking article, wherein the additive releasing material comprises at least 30% additive by weight, wherein the additive or at least one of the additives has a molecular weight of 50 to 100 g/mol.
A smoking article filter comprising an additive releasing material, the additive releasing material comprising a porous carrier material having adsorbed on its surface one or more additives, wherein from 10% to 90% of the total pore volume of the porous carrier material is filled with the additive(s) and wherein the additive releasing material comprises at least 30% additive by weight, and wherein the additive releasing material releases the additive(s) from the surface of the porous carrier material by desorption when the material is exposed to a temperature at a desorption temperature of from about 45° C. to about 70° C., wherein the additive or at least one of the additives has a molecular weight of 50 to 100 g/mol.
Dependencies are inferred from the claim text.