Menthol cigarette
Cigarettes are provided which contain a filtering system and flavorants encapsulated with polyvinyl acetate, wherein deactivation of a sorbent by the flavorant is reduced through the encapsulation of the flavorant within the polyvinyl acetate. A preferred flavorant is menthol. The encapsulated flavorants are prepared by mixing at least one flavorant with polyvinyl acetate and a solvent, such as ethanol, and forming the encapsulated flavorants. Methods of making cigarettes and smoking the articles are also provided.
1. A method of making a cigarette including a sorbent in a filter thereof, comprising:
incorporating an encapsulated flavorant comprising a triacetin-free polyvinyl acetate matrix with flavorant bound within the polyvinyl acetate matrix in a component of the cigarette,
wherein the flavorant comprises menthol and wherein the menthol is substantially uniformly distributed throughout the matrix.
2. The method of claim 1 , wherein the sorbent comprises activated carbon, molecular sieves, zeolites, or combinations thereof.
3. The method of claim 1 , wherein the encapsulated flavorant is:
formed by:
(i) mixing alcohol and polyvinyl acetate;
(ii) mixing menthol into the alcohol-polyvinyl acetate mixture in an amount effective to provide at least 10 μg/puff of menthol flavoring tobacco smoke produced during smoking of the cigarette;
(iii) reducing the alcohol content in the menthol-alcohol-polyvinyl acetate mixture or aging the menthol-alcohol-polyvinyl acetate mixture; and
(iv) forming a menthol-polyvinyl acetate fiber, film, monolith, bead, powder or granule from the menthol-alcohol-polyvinyl acetate mixture.
4. The method of claim 1 , wherein the incorporating the encapsulated flavorant in a component of the cigarette comprises injecting a liquid encapsulated flavorant mixture into a tobacco portion of the cigarette, injecting the liquid encapsulated flavorant into a center portion of a tobacco portion of the cigarette, spraying or coating a liquid encapsulated flavorant onto a tobacco filler and forming a tobacco rod for the cigarette from the sprayed or coated tobacco filler, distributing a liquid or solid encapsulated flavorant throughout a tobacco rod of the cigarette, incorporating a solid encapsulated flavorant into a tobacco filler and forming a tobacco rod for the cigarette from the tobacco filler mixed with the encapsulated flavorant, or placing a fiber, monolith, bead, powder or granule encapsulated flavorant in a cavity in a filter portion of the cigarette or in a tobacco filler in the cigarette.
5. A method of flavoring mainstream tobacco smoke, comprising:
retaining a flavorant with a triacetin-free polyvinyl acetate matrix; and
releasing the flavorant from the matrix while generating mainstream tobacco smoke, said releasing step including an application of heat and/or moisture to the matrix, wherein the flavorant is released by heat and/or moisture from the tobacco smoke;
wherein the flavorant comprises menthol and wherein the menthol is substantially uniformly distributed throughout the matrix.
6. The method of claim 5 , wherein the releasing the flavorant from the matrix comprises gradually releasing the menthol into the tobacco smoke.
7. The method of claim 5 , further comprising:
(a) passing the mainstream tobacco smoke through a sorbent, wherein the sorbent reduces benzene, acrolein and/or 1,3-butadiene levels when tobacco smoke is drawn through the cigarette; and/or
(b) passing the mainstream tobacco smoke through a sorbent, wherein the sorbent comprises activated carbon, molecular sieves, zeolites, or combinations thereof.
8. The method of claim 5 , wherein releasing the flavorant from the matrix comprises:
(a) gradually releasing the flavorant using the heat and/or moisture from the smoke drawn through a cigarette; and/or
(b) gradually releasing the flavorant located in (i) cut filler, (ii) on cigarette paper and/or (iii) in a filter of the cigarette.