Low sidestream smoke cigarette with combustible paper having a modified ash

Abstract

A low sidestream smoke cigarette comprises a conventional tobacco rod, and a combustible treatment paper having a sidestream smoke treatment composition. The treatment composition comprises in combination, an oxygen storage and donor metal oxide oxidation catalyst and an essentially non-combustible particulate adjunct for said catalyst. Improvements are made in the treatment composition and/or the addition of metal oxides or carbonates thereto to improve ash characteristics.

1 . In a low sidestream smoke cigarette having a conventional tobacco rod and a combustible treatment paper, said treatment paper having a sidestream smoke treatment composition comprising an oxygen storage and donor metal oxide oxidation catalyst and an essentially non-combustible finely divided particulate adjunct for said catalyst, the improvement comprising the use of a solid solution of particulate mixed metal oxides as said catalyst and said adjunct.  
     
     
         2 . In a low sidestream smoke cigarette of  claim 1 , said oxygen storage and donor metal oxide oxidation catalyst for the solid solution being selected from the group consisting of lanthinum oxide, cerium oxide, praseodymium oxide, neodymium oxide and mixtures thereof.  
     
     
         3 . In a low sidestream smoke cigarette of  claim 1 , said adjunct is selected from the group of metal oxides consisting of zirconium oxide, aluminum oxide, magnesium oxides, titanium oxide and mixtures thereof.  
     
     
         4 . In a low sidestream smoke cigarette of  claim 1 , said solid solution of mixed metal oxides further comprising an oxidation catalyst selected from the group consisting of palladium, platinum, rhodium, tin oxide, copper oxide, iron oxide, manganese oxide and mixtures thereof.  
     
     
         5 . In a low sidestream smoke cigarette of  claim 1 , said solid solution of mixed metal oxides being selected from the group consisting of cerium/lanthinum mixed oxide, cerium/zirconium mixed oxide, cerium/zirconium/lanthinum mixed oxide, cerium/zirconium/praseodynium mixed oxide, cerium/zirconium/lanthinum/praseodynium mixed oxide, cerium/zirconium/neodymium mixed oxide and mixtures thereof.  
     
     
         6 . In a low sidestream smoke cigarette of  claim 1 , said solid solution being a high surface area porous particulate.  
     
     
         7 . In a low sidestream smoke cigarette of  claim 6 , said solid solution being a low surface area particulate.  
     
     
         8 . In a low sidestream smoke cigarette of  claim 6 , wherein said catalyst and said adjunct is said high surface area cerium/zirconium mixed oxide.  
     
     
         9 . In a low sidestream smoke cigarette of  claim 1 , wherein a catalyst selected from the group consisting of palladium, platinum, rhodium, tin oxide, copper oxide, iron oxide, manganese oxide and mixtures thereof is either included in said solid solution of cerium/zirconium mixed oxide or is applied to the surface of said high surface area cerium/zirconium mixed oxide.  
     
     
         10 . In a low sidestream smoke cigarette of  claim 9 , wherein said cerium/zirconium mixed oxide has a particle size greater than about 1 μm.  
     
     
         11 . In a low sidestream smoke cigarette of  claim 10 , wherein said cerium/zirconium mixed oxide has a particle size less than about 30 μm.  
     
     
         12 . In a low sidestream smoke cigarette of  claim 8 , wherein said cerium/zirconium mixed oxide have a ratio ranging from about 5:95 to about 95:5.  
     
     
         13 . In a low sidestream smoke cigarette of  claim 12 , wherein said ratio is about 75:25 and said particle size is about 6 μm to 10 μm.  
     
     
         14 . In a low sidestream smoke cigarette of  claim 1 , wherein said treatment composition is incorporated within said treatment paper at a loading rate of about 2.5 g/m 2  to about 125 g/M 2 .  
     
     
         15 . In a low sidestream smoke cigarette of  claim 1 , wherein said treatment composition is coated on said treatment paper.  
     
     
         16 . In a low sidestream smoke cigarette of  claim 8 , wherein said treatment composition includes particulate zirconium oxide, titanium oxide, magnesium oxide, aluminum oxide, cerium oxide, tin oxide, iron oxide, manganese oxide, calcium carbonate, zirconium carbonate, magnesium carbonate and mixtures thereof.  
     
     
         17 . In a low sidestream smoke cigarette of  claim 8 , wherein said treatment composition includes particulate zeolite.  
     
     
         18 . In a low sidestream smoke cigarette of  claim 17 , wherein said zeolite is a carrier for an oxidation catalyst selected from the group consisting of palladium, platinum, rhodium, tin oxide, copper oxide, iron oxide, manganese oxide, and mixtures thereof.  
     
     
         19 . In a low sidestream smoke cigarette of  claim 8 , wherein said treatment composition includes zirconium oxide.  
     
     
         20 . A low sidestream smoke cigarette comprising a conventional tobacco rod and a combustible treatment paper having a sidestream smoke treatment composition, said treatment composition comprising an oxygen storage and donor metal oxide oxidation catalyst, an essentially non-combustible particulate adjunct for said catalyst and a metal oxide or carbonate for modifying ash characteristics.  
     
     
         21 . A low sidestream smoke cigarette of  claim 20 , wherein said adjunct is a high surface area particulate.  
     
     
         22 . A low sidestream smoke cigarette of  claim 21 , wherein said particulate adjunct is a zeolite based material ranging from about 0.1% by weight of total dry weight composition to about 60% by weight of total dry weight composition and preferably less than 25% by weight and most preferably less than 15% by weight.  
     
     
         23 . A low sidestream smoke cigarette of  claim 21 , wherein said ash modifying metal oxide or carbonate is selected from the group consisting of zirconium oxide, titanium oxide, magnesium oxide, aluminum oxide, cerium oxide, tin oxide, iron oxide, manganese oxide, calcium carbonate, zirconium carbonate, magnesium carbonate and mixtures thereof.  
     
     
         24 . A low sidestream smoke cigarette of  claim 20 , wherein said adjunct is a support for a ceria sol to be applied thereto and dried.  
     
     
         25 . A low sidestream smoke cigarette of  claim 24 , wherein said adjunct is high surface area cerium oxide.  
     
     
         26 . A low sidestream smoke cigarette of  claim 20 , wherein said oxygen storage and donor metal oxide oxidation catalyst is selected from a group consisting of transition metal oxides, rare earth metal oxides and mixtures thereof.  
     
     
         27 . A low sidestream smoke cigarette of  claim 26 , wherein said transition metal oxides are selected from the group consisting of oxides of group IVB, VB, VIB, VIIB, VIIIB, IB metals and mixtures thereof.  
     
     
         28 . A low sidestream smoke cigarette of  claim 27 , wherein said rare earth metal oxide is selected from the group consisting of oxides consisting of scandium, yttrium and lanthanide metals and mixtures thereof.  
     
     
         29 . A low sidestream smoke cigarette of  claim 20  wherein said lanthanide metals oxide are selected from the group consisting of lanthinum oxide, cerium oxide, praseodymium oxide, neodymium oxide and mixtures thereof.  
     
     
         30 . A low sidestream smoke cigarette of  claim 29 , wherein said oxygen storage and donor metal oxide oxidation catalyst and adjunct therefor is a solid solution of mixed metal oxides where the adjuncts are selected from the group consisting of zirconium oxide, aluminium oxide, magnesium oxide, titanium oxide and mixtures thereof.  
     
     
         31 . A low sidestream smoke cigarette of the preceding  claim 30 , wherein said solid solution of mixed metal oxides comprises a catalyst selected from the group consisting of palladium, platinum, rhodium, tin oxide, copper oxide, iron oxide, manganese oxide.  
     
     
         32 . A low sidestream smoke cigarette of  claim 20 , wherein said solid solution of mixed metal oxides includes cerium/lanthinum mixed oxides, cerium/zirconium mixed oxides, cerium/aluminum mixed oxides, cerium/magnesium mixed oxides, cerium/titanium mixed oxides, cerium/zirconium/lanthinum mixed oxides, cerium/lanthinum mixed oxide, cerium/zirconium mixed oxide, cerium/zirconium/lanthinum mixed oxide, cerium/zirconium/praseodynium mixed oxide, cerium/zirconium/lanthinum/praseodynium mixed oxide, cerium/zirconium/neodymium mixed oxide.  
     
     
         33 . A low sidestream smoke cigarette of  claim 20 , wherein said adjunct is selected from the group consisting of clays essentially non-combustible mill fibers, monolithe mineral base materials, essentially non-combustible carbon, zeolytes and mixtures thereof.  
     
     
         34 . A low sidestream smoke cigarette of  claim 33 , wherein said adjuncts are selected from the group consisting of zirconium oxide, titanium oxide, magnesium oxide, aluminum oxide, cerium oxide, tin oxide, iron oxide, manganese oxide, calcium carbonate, zirconium carbonate, magnesium carbonate and mixtures thereof, metal oxide fibers and milled porous ceramic fibers and mixtures thereof.  
     
     
         35 . In a low sidestream smoke cigarette of  claim 29 , said solid solution being a high surface area porous particulate.  
     
     
         36 . In a low sidestream smoke cigarette of  claim 29 , said solid solution being a low surface area particulate.  
     
     
         37 . A low sidestream of smoke cigarette of  claim 23 , wherein said ash modifying particulate is zirconium oxide.  
     
     
         38 . A low sidestream smoke cigarette of  claim 29 , wherein an oxidation catalyst is used with said oxygen storage and donor metal oxide oxidation catalyst, said oxidation catalyst being selected from the group consisting of palladium, platinum, rhodium, tin oxide, copper oxide, iron oxide, manganese oxide, and mixtures thereof.  
     
     
         39 . A low sidestream smoke cigarette of  claim 22 , wherein said zeolite is a Y-type zeolite, ZSM-5 type zeolite or Beta type zeolite.  
     
     
         40 . A low sidestream smoke cigarette of clam  29 , wherein said oxygen storage and donor metal oxide oxidation catalyst is a porous particulate solid solution of cerium/zirconium which is preferably a mixed oxide high surface area material.  
     
     
         41 . A low sidestream smoke cigarette of  claim 40 , wherein zirconium oxide and/or a zeolite are used in combination with said cerium/zirconium mixed oxide.  
     
     
         42 . A low sidestream smoke cigarette of  claim 41 , wherein an oxidation catalyst is used with said cerium/zirconium metal oxide, zirconium oxide and/or zeolite.  
     
     
         43 . A low sidestream smoke cigarette of  claim 42 , wherein said oxidation catalyst is selected from the group consisting of palladium, platinum, rhodium, tin oxide, copper oxide, iron oxide, manganese oxide, and mixtures thereof, said selected oxidation catalyst being either incorporated in said solid solution of cerium/zirconium mixed oxide or applied to surfaces of particulate cerium/zirconium mixed oxide, zirconium oxide and/or zeolite.  
     
     
         44 . A low sidestream smoke cigarette of  claim 42 , wherein said zeolite is a Y-type zeolite.  
     
     
         45 . A low sidestream smoke cigarette of  claim 20 , wherein said treatment composition is applied as a coating to cigarette paper, said coating composition including a metal oxide or carbonate selected from the group consisting of zirconium oxide, titanium oxide, magnesium oxide, aluminum oxide, cerium oxide, tin oxide, iron oxide, manganese oxide, calcium carbonate, zirconium carbonate, magnesium carbonate and mixtures thereof.  
     
     
         46 . A low sidestream smoke cigarette of  claim 20 , wherein said combustible treatment paper comprises an inner sheet and an outer sheet, said inner sheet comprises said treatment composition for reducing sidestream smoke, said outer layer comprising a treatment composition for modifying ash characteristics.  
     
     
         47 . A low sidestream smoke cigarette of  claim 46 , wherein said inner paper has greater than 35% by weight of a zeolite material.  
     
     
         48 . A low sidestream smoke cigarette of  claim 48 , wherein said inner paper and outer paper have said treatment composition coated, incorporated or impregnated thereon or therein.  
     
     
         49 . A low sidestream smoke cigarette of  claim 48 , wherein said inner paper has said sidestream smoke reduction composition incorporated therein.  
     
     
         50 . A low sidestream smoke cigarette of  claim 48 , wherein said inner paper has said sidestream smoke reduction composition coated thereon.  
     
     
         51 . A low sidestream smoke cigarette of  claim 48 , wherein said inner paper has said sidestream smoke reduction composition incorporated and coated thereon.  
     
     
         52 . A low sidestream smoke cigarette of  claim 48 , wherein said outer paper has said sidestream smoke reduction composition incorporated thereon.  
     
     
         53 . A low sidestream smoke cigarette of  claim 48 , wherein said outer paper has said sidestream smoke reduction composition coated thereon.  
     
     
         54 . A low sidestream smoke cigarette of  claim 48 , wherein said outer paper has said sidestream smoke reduction composition incorporated and coated thereon.  
     
     
         55 . A low sidestream smoke cigarette of  claim 46  said inner paper comprising an oxygen storage and donor metal oxide oxidation catalyst with adjunct and a high surface area adsorptive material, the outer layer comprising an oxygen storage and donor metal oxide oxidation catalyst with adjunct and metal oxide for modifying ash characteristics.  
     
     
         56 . A low sidestream smoke cigarette of  claim 55 , wherein said treatment composition for reducing sidestream smoke and said treatment composition for modifying ash are applied as a coatings respectively to said inner sheet and said outer sheet.  
     
     
         57 . A low sidestream smoke cigarette of  claim 56 , wherein said oxygen storage and donor metal oxide oxidation catalyst is a porous particulate high surface area solid solution cerium/zirconium mixed oxide.  
     
     
         58 . A low sidestream smoke cigarette of  claim 57 , wherein said cerium oxide and said zirconium oxide in said solid solution are in a ratio of about 5:95 to about 95:5.  
     
     
         59 . A low sidestream smoke cigarette of  claim 58 , wherein said coating is applied to said inner and outer sheets on either or both sides of each of said sheets.  
     
     
         60 . A low sidestream smoke cigarette comprising a conventional tobacco rod and a combustible treatment paper having a sidestream smoke treatment composition, said treatment composition comprising an oxygen storage and donor metal oxide oxidation catalyst, an essentially non-combustible high surface area adjunct for said catalyst incorporated in said treatment paper and a coating of calcium carbonate on an exterior surface of said treatment paper to modify ash characteristics.  
     
     
         61 . A low sidestream smoke cigarette of  claim 60 , wherein said adjunct includes a zeolite based material.  
     
     
         62 . A low sidestream smoke cigarette of  claim 61 , wherein said zeolite based material is in an amount ranging from about 0.1% by weight of total dry weight composition to about 60% by weight of total dry weight composition and preferably less than 25% and most preferably less than 15%.  
     
     
         63 . A low sidestream smoke cigarette of  claim 60 , wherein said oxygen storage and donor metal oxide oxidation catalyst is selected from a group consisting of transition metal oxides, rare earth metal oxides and mixtures thereof.  
     
     
         64 . A low sidestream smoke cigarette of  claim 61 , wherein said transition metal oxides are selected from the group consisting of oxides of group IVB, VB, VIB, VIIB, VIIIB, IB metals and mixtures thereof.  
     
     
         65 . A low sidestream smoke cigarette of  claim 62 , wherein said rare earth metal oxide is selected from the group consisting of oxides consisting of scandium, yttrium, lanthanide metals and mixtures thereof.  
     
     
         66 . A low sidestream smoke cigarette of  claim 60 , wherein said lanthanide metal oxide is selected from the group consisting of lanthinum oxide, cerium oxide, praseodymium oxide, neodymium oxide and mixtures thereof.  
     
     
         67 . A low sidestream smoke cigarette of  claim 66 , wherein said oxygen storage and donor metal oxide oxidation catalyst and adjunct therefor is a solid solution of mixed metal oxides where the adjuncts are selected from the group consisting of zirconium oxide, aluminium oxide, magnesium oxide, titanium oxide and mixtures thereof.  
     
     
         68 . A low sidestream smoke cigarette of the preceding  claim 67 , wherein said solid solution comprises a metal catalyst selected from the group consisting of palladium, platinum, rhodium, tin oxide, copper oxide, iron oxide, manganese oxide and mixtures thereof.  
     
     
         69 . A low sidestream smoke cigarette of  claim 68 , wherein said solid solution of mixed metal oxides includes cerium/lanthinum mixed oxides, cerium/zirconium mixed oxides, cerium/aluminum mixed oxides, cerium/magnesium mixed oxides, cerium/titanium mixed oxides, cerium/zirconium/lanthinum mixed oxides, cerium/lanthinum mixed oxide, cerium/zirconium mixed oxide, cerium/zirconium/lanthinum mixed oxide, cerium/zirconium/praseodynium mixed oxide, cerium/zirconium/lanthinum/praseodynium mixed oxide, cerium/zirconium/neodymium mixed oxide.  
     
     
         70 . In a low sidestream smoke cigarette of  claim 66 , said solid solution being a high surface area porous particulate.  
     
     
         71 . A low sidestream smoke cigarette of  claim 66 , wherein an oxidation catalyst is used with said oxygen storage and donor metal oxide oxidation catalyst, said oxidation catalyst being selected from the group consisting of palladium, platinum, rhodium, tin oxides, copper oxides, iron oxides, manganese oxides, and mixtures thereof.  
     
     
         72 . A low sidestream smoke cigarette of  claim 61 , wherein said zeolite is a Y-type zeolite, ZSM-5 type zeolite or Beta type zeolite.  
     
     
         73 . A low sidestream smoke cigarette of clam  72 , wherein said oxygen storage and donor metal oxide oxidation catalyst is a porous particulate cerium/zirconium mixed oxide high surface area material.  
     
     
         74 . A low sidestream smoke cigarette of  claim 73 , wherein an oxidation catalyst is used with said cerium/zirconium mixed oxide, zirconium oxide and/or zeolite.  
     
     
         75 . A low sidestream smoke cigarette of  claim 74 , wherein said oxidation catalyst is selected from the group consisting of palladium, platinum, rhodium, tin oxide, copper oxide, iron oxide, manganese oxide, and mixtures thereof, said selected oxidation catalyst being either incorporated in said solid solution of cerium/zirconium mixed oxide or applied to surfaces of particulate cerium/zirconium mixed oxide, zirconium oxide and/or zeolite.  
     
     
         76 . A low sidestream smoke cigarette of  claim 75 , wherein said zeolite is a Y-type zeolite.  
     
     
         77 . A low sidestream smoke cigarette of  claim 60 , wherein a binder for said calcium carbonate coating is selected from the group consisting of polyvinylalcohol, starches, CMC, casein, soya, binding clays, inorganic binders and mixtures thereof.