초록 ▼

Smoking articles which use thiol-functionalized sorbents are provided. The thiol-functionalized sorbents comprise at least one thioalkylsilyl compound covalently bound to an inorganic molecular sieve substrate, where the thiol-functionalized sorbent is capable of removing at least one heavy metal co

Smoking articles which use thiol-functionalized sorbents are provided. The thiol-functionalized sorbents comprise at least one thioalkylsilyl compound covalently bound to an inorganic molecular sieve substrate, where the thiol-functionalized sorbent is capable of removing at least one heavy metal constituent of mainstream smoke. The thiol-functionalized sorbents are particularly useful for the removal of mercury and/or cadmium from mainstream smoke. Methods for making cigarette filters and smoking articles using the thiol-functionalized sorbent, as well as methods for smoking a cigarette comprising the thiol-functionalized sorbent, are also provided.

대표청구항 ▼

What is claimed is: 1. A smoking article comprising a thiol-functionalized sorbent having at least one thioalkylsilyl compound covalently bound to an inorganic molecular sieve substrate, wherein the thiol-functionalized sorbent is located in a filter and is present in an amount effective for removi

What is claimed is: 1. A smoking article comprising a thiol-functionalized sorbent having at least one thioalkylsilyl compound covalently bound to an inorganic molecular sieve substrate, wherein the thiol-functionalized sorbent is located in a filter and is present in an amount effective for removing cadmium from mainstream smoke, and wherein the smoking article is selected from the group consisting of a cigarette, a pipe, a cigar and a non-traditional cigarette. 2. The smoking article of claim 1, wherein the smoking article is a cigarette. 3. The smoking article of claim 1, wherein the filter is selected from the group consisting of a mono filter, a dual filter, a triple filter, a cavity filter, a recessed filter, and a free-flow filter. 4. The smoking article of claim 1, wherein the inorganic molecular sieve substrate comprises mesoporous or microporous molecular sieves. 5. The smoking article of claim 1, wherein the inorganic molecular sieve substrate is selected from the group consisting of zeolite, aluminophosphate, mesoporous silicate, mesoporous aluminosilicate, and mixtures thereof. 6. The smoking article of claim 5, wherein the inorganic molecular sieve substrate comprises a zeolite. 7. The smoking article of claim 6, wherein the zeolite is selected from the group consisting of zeolite ZSM-5, zeolite A, zeolite X, zeolite Y, zeolite K-G, zeolite ZK-5, zeolite Beta, zeolite ZK-4, and mixtures thereof. 8. The smoking article of claim 7, wherein the zeolite is selected from the group consisting of zeolite ZSM-5, zeolite Y, and mixtures thereof. 9. The smoking article of claim 1, wherein the thiol-functionalized sorbent comprises 3-thiopropylsilane covalently bound to a zeolite. 10. The smoking article of claim 1, wherein the thiol-functionalized sorbent comprises a silicate material. 11. The smoking article of claim 1, wherein the thiol-functionalized sorbent comprises 3-thiopropylsilane covalently bound to a mesoporous silicate. 12. The smoking article of claim 1, wherein the thioalkylsilyl group is covalently bound on exterior and interior surfaces of the inorganic molecular sieve substrate and wherein the inorganic molecular sieve substrate is a mesoporous molecular sieve. 13. The smoking article of claim 1, wherein the thiol-functionalized sorbent comprises a thioalkylsilyl group having more than three carbons. 14. The smoking article of claim 1, wherein the thiol-functionalized sorbent is in granular form having a particle size from about 20 mesh to about 60 mesh. 15. The smoking article of claim 1, comprising from about 10 mg to about 300 mg of the thiol-functionalized sorbent. 16. The smoking article of claim 1, comprising from about 100 mg to about 200 mg of the thiol-functionalized sorbent. 17. A cigarette filter comprising a thiol-functionalized sorbent having at least one thioalkylsilyl compound covalently bound to an inorganic molecular sieve substrate, and wherein the thiol-functionalized sorbent is present in an amount effective for removing cadmium from mainstream smoke. 18. The cigarette filter of claim 17, wherein the inorganic molecular sieve substrate comprises mesoporous or microporous molecular sieves. 19. The cigarette filter of claim 17, wherein the inorganic molecular sieve substrate is selected from the group consisting of zeolite, aluminophosphate, mesoporous silicate, mesoporous aluminosilicate, and mixtures thereof. 20. The cigarette filter of claim 19, wherein the inorganic molecular sieve substrate comprises a zeolite. 21. The cigarette filter of claim 20, wherein the zeolite is selected from the group consisting of zeolite ZSM-5, zeolite A, zeobte X, zeolite Y, zeolite K-G, zeolite ZK-5, zeolite Beta, zeolite ZK-4, and mixtures thereof. 22. The cigarette filter of claim 21, wherein the zeolite is selected from the group consisting of zeolite ZSM-5, zeolite Y, and mixtures thereof 23. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent comprises 3-thiopropylsilane covalently bound to a zeolite. 24. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent comprises a silicate material. 25. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent comprises 3-thiopropylsilane covalently bound to a mesoporous silicate. 26. The cigarette filter of claim 17, wherein the thioalkylsilyl group is covalently bound on exterior and interior surfaces of the inorganic molecular sieve substrate and wherein the molecular sieve is a mesoporous molecular sieve. 27. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent comprises a thioalkylsilyl group having more than three carbons. 28. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent is in granular form having a particle size from about 20 mesh to about 60 mesh. 29. The cigarette Filter of claim 17, comprising from about 10 mg to about 300 mg of the thiol-functionalized sorbent. 30. The cigarette filter of claim 17, comprising from about 100 mg to about 200 mg of the thiol-functionalized sorbent. 31. The cigarette filter of claim 17, wherein the filter is selected from the group consisting of a mono filter, a dual filter, a triple filter, a cavity filter, a recessed filter, and a free-flow filter. 32. The cigarette filter of claim 17, wherein the filter comprises cellulose acetate tow, cellulose paper, mono cellulose, mono acetate, and combinations thereof. 33. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent is incorporated into one or more cigarette filter parts selected from the group consisting of shaped paper insert, a plug, a space, cigarette filter paper, and a free-flow sleeve. 34. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent is incorporated with cellulose acetate fibers forming a plug or a free-flow filter element. 35. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent is incorporated with polypropylene fibers forming a plug or free-flow filter element. 36. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent is incorporated in at least one of a mouthpiece filter plug, a first tubular filter element adjacent to the mouthpiece filter plug, and a second tubular filter element adjacent to the first tubular element. 37. The cigarette filter of claim 17, wherein the thiol-functionalized sorbent is incorporated in at least one part of a three-piece filter including a mouthpiece filter plug, a first filter plug adjacent to the mouthpiece filter plug, and a second filter plug adjacent to the first filter plug. 38. A method of making a cigarette filter, the method comprising: incorporating a thiol-functionalized sorbent into the cigarette filter of claim 17, wherein the thiol-functionalized sorbent comprises at least one thioalkylsilyl compound covalently bound to inorganic molecular sieve substrate. 39. The method of claim 38, wherein the filter is a mono filter, a dual filter, a triple filter, a cavity filter, a recessed filter, or a free-flow filter. 40. A method of making a cigarette, 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 to form a tobacco rod; and (iii) attaching the cigarette filter of claim 17 to the tobacco rod using tipping paper to form the cigarette. 41. A method of smoking the cigarette of claim 2, comprising lighting the cigarette to form smoke and drawing the smoke through the cigarette, wherein during the smoking of the cigarette, the thiol-functionalized sorbent removes the at least one heavy metal constituent of mainstream smoke. 42. A cut filler composition comprising tobacco and a thiol-functionalized sorbent having at least one thioalkylsilyl compound covalently bound to an inorganic molecular sieve substrate, wherein the thiol-functionalized sorbent is capable of removing at least some of a heavy metal constituent of mainstream smoke.