초록 ▼

Cut filler compositions, smoking articles such as cigarettes, methods for making cigarettes and methods for treating cigarette smoke are provided, which involve the use of metal-containing nanowires. The metal-containing nanowires are capable of removing at least one constituent from tobacco smoke,

Cut filler compositions, smoking articles such as cigarettes, methods for making cigarettes and methods for treating cigarette smoke are provided, which involve the use of metal-containing nanowires. The metal-containing nanowires are capable of removing at least one constituent from tobacco smoke, preferably in a selective manner. The metal-containing nanowires may comprise any suitable metal, metal oxide or mixtures thereof. For example, the metal-containing nanowires comprise at least one transition or lanthanide metal or metal oxide thereof. Exemplary metals or metal oxides thereof include, but are not limited to, iron, copper, zinc, titanium, vanadium, palladium, cobalt, molybdenum and manganese. The metal-containing nanowires may be produced by (i) loading at least one metal-containing composition into a mesoporous molecular sieve substrate via repeated incipient-wetness impregnation followed by stepwise calcination to form said nanowires; and (ii) isolating the nanowires by extracting the mesoporous molecular sieve substrate, e.g., with aqueous NaOH.

대표청구항 ▼

1. A smoking article comprising metal-containing nanowires having uniform dimensions, wherein the metal-containing nanowires are capable of removing at least one constituent from tobacco smoke, wherein the at least one constituent is selected from the group consisting of aldehydes, carbon monoxide,

1. A smoking article comprising metal-containing nanowires having uniform dimensions, wherein the metal-containing nanowires are capable of removing at least one constituent from tobacco smoke, wherein the at least one constituent is selected from the group consisting of aldehydes, carbon monoxide, 1,3-butadiene, isoprene, acrolein, acrylonitrile, hydrogen cyanide, o-toluidine, 2-naphtylamine, nitrogen oxide, benzene, N-nitrosonornicotine, phenol, catechol, benz(a)anthracene, benzo(a)pyrene, and mixtures thereof, and the metal-containing nanowires are present in an amount effective to remove at least about 30% of at least one constituent from mainstream smoke; wherein the metal-containing nanowires are less than 100 nm in diameter and have an aspect ratio of length to width between about 100 to about 1000 or the metal-containing nanowires are less than 5 nm in diameter;wherein the metal-containing nanowires are incorporated in support particles having a particle size of 100 μm or less located in a filter portion of the smoking article and the metal-containing nanowires are disposed on a cut filler of the smoking article; wherein the metal-containing nanowires are produced by: (i) loading at least one metal-containing composition into a mesoporous molecular sieve substrate via repeated incipient-wetness impregnation followed by stepwise calcination to form said metal-containing nanowires; and (ii) isolating the nanowires by extracting the mesoporous molecular sieve substrate;and wherein the metal-containing nanowires comprise a metal, a metal oxide or mixtures thereof, comprising at least one metal or metal oxide thereof selected from the group consisting of iron, copper, zinc, titanium, vanadium, silver, palladium, cobalt, molybdenum and manganese. 2. The smoking article of claim 1, wherein the mesoporous molecular sieve substrate is selected from the group consisting of MCM-41, MCM-48 and SBA-15. 3. The smoking article of claim 1, wherein the smoking article contains greater than about 5 mg and up to about 200 mg of the metal-containing nanowires, and the article is a cigarette. 4. The smoking article of claim 3, wherein the metal-containing nanowires are also located in a paper wrapper. 5. The smoking article of claim 3, wherein the metal-containing nanowires are incorporated into one or more filter parts selected from the group consisting of: shaped paper insert, a plug, a space, cigarette filter paper, a cellulose acetate sleeve, a polypropylene sleeve, and a free-flow sleeve. 6. A method of making the cigarette of claim 3, the method comprising: (i) providing a cut filler to a cigarette making machine to form a tobacco column;(ii) placing a paper wrapper around the tobacco column; and(iii) attaching a cigarette filter to the tobacco rod using tipping paper to form the cigarette, wherein at least the cigarette filter and the cut filler comprises an effective amount of metal-containing nanowires capable of removing at least one constituent from mainstream tobacco smoke. 7. A method of treating mainstream smoke of a smoking article of claim 3, comprising drawing mainstream smoke through the cigarette and removing at least one constituent of the mainstream smoke with the metal containing nanowires. 8. The smoking article of claim 1, wherein the filter portion is a mono filter, a dual filter, a triple filter, a cavity filter, a recessed filter or a free-flow filter.