Tobacco – Tobacco or tobacco substitute product or component part thereof – Cigar or cigarette
Reexamination Certificate
1999-09-20
2001-09-18
Silverman, Stanley S. (Department: 1731)
Tobacco
Tobacco or tobacco substitute product or component part thereof
Cigar or cigarette
C131S360000, C162S139000
Reexamination Certificate
active
06289898
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to smoking article wrappers. In particular, the invention relates to ammonium-containing compounds used as novel fillers in paper wrappers for smoking articles which are effective in selectively reducing the content of gaseous components, such as low molecular weight aldehydes, from the smoke produced during the use of such smoking articles.
BACKGROUND OF THE INVENTION
Paper wrappers for smoking articles are disclosed in U.S. Pat. Nos. 2,673,565; 2,801,636; 3,744,496; 3,931,824; 4,129,134; 4,225,636; 4,231,377; 4,420,002; 4,433,697; 4,450,847; 4,622,983; 4,805,644; 4,881,557; 4,911,184; 4,915,118; 4,924,888; 4,941,485; 4,941,486; 4,984,589; 4,998,542; 4,998,543; 5,060,674; 5,092,306; 5,105,837; 5,103,844; 5,121,759; 5,131,416; 5,220,930; 5,228,463; 5,450,862; and 5,540,242, the disclosures of which are hereby incorporated by reference.
Of the above patents, the '674 patent discloses adding monoammonium phosphate to cigarette paper as a burn modifier; the '543 patent discloses adding monoammonium phosphate to cigarette paper to reduce streaking of the outer paper due to condensation on the inside paper following puffs; the '837 patent discloses adding halides, sulfates and phosphates such as ammonium chloride, magnesium chloride, magnesium sulfate, mono-ammonium sulfate and disodium phosphate to cigarette paper as burn retardants; and the '242 patent discloses adding alginates including ammonium alginate to cigarette paper as a film forming additive to reduce sidestream smoke.
U.S. Pat. No. 2,815,760 discloses a tobacco smoke filter having an ion exchange material which chemically reacts with and retains carbonyl compounds such as aldehydes in the filter. U.S. Pat. No. 3,685,070 discloses a tobacco smoke filter containing the lipid soluble antioxidant N,N′-diphenyl-p-phenylenediamine (DDPD) for lowering the cytotoxic substances in the smoke. U.S. Pat. No. 3,716,063 discloses a tobacco smoke filter which selectively removes volatile aldehydes, the filter being a porous particulate material such as alumina impregnated with buffered poly(alkyleneimines). U.S. Pat. No. 3,878,853 discloses a cigarette filter containing a cationic component and a high molecular weight polyamine component for removal of ciliatoxic compounds from tobacco smoke.
While there have been proposals in the prior art for modifications to cigarette filters to remove aldehydes from mainstream smoke, such proposals lead away from the present invention wherein the wrapper of a tobacco smoking article is effective in reducing the content of gaseous components in mainstream smoke.
SUMMARY OF THE INVENTION
The invention provides a wrapper for a smoking article wherein tobacco is contained by the wrapper, the wrapper comprising a cellulosic web material and at least one filler therein, the filler being effective to selectively reduce the content of gaseous components in smoke produced by combustion/pyrolysis of the smoking article. According to a preferred embodiment, the wrapper comprises cigarette paper with an ammonium-containing compound filler in an amount effective to reduce aldehyde content in the smoke produced upon combustion/pyrolysis of the smoking article. The ammonium-containing compound filler is preferably an inorganic ammonium metal salt of low solubility such as magnesium ammonium phosphate. When used as a filler in the fabrication of wrappers for smoking articles, an amount equal to about 10% to about 60% of the final wrapper weight should be used, preferably about 20% to about 50% by weight based on the total weight of the wrapper.
In the smoking article wrappers of this invention ammonium-containing compounds may be used as the sole filler or may be mixed with other fillers known in the art. The filler can comprise two or more different ammonium-containing compounds. The wrapper can have a basis weight of between about 15 grams per square meter to about 75 grams per square meter, preferably a basis weight of between about 20 to about 50 grams per square meter, and a porosity of between about 2 CORESTA units to about 200 CORESTA units, preferably between about 10 CORESTA units to about 110 CORESTA units. The wrapper can include burn additives from about 2% to about 15% by weight based on the total weight of the wrapper. In addition, the wrappers of this invention may be a conventional one wrapper construction, a multiwrapped construction or a multilayer single wrap construction. Multiwrapped constructions or multilayered constructions might have different levels of ammonium-containing fillers. If desired, the wrapper is perforated and/or includes a film forming agent. In a preferred embodiment, the wrapper, comprising an ammonium-containing compound filler, is used to contain tobacco within a smoking article which upon combustion/pyrolysis leads to a reduction in the quantity of low molecular weight aldehydes in smoke.
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Fournier Jay A
Paine, III John B.
Burns Doane , Swecker, Mathis LLP
Philip Morris Incorporated
Silverman Stanley S.
Walls Dionne A.
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