Treatment of mainstream smoke constituents by use of oxygen storage and donor metal oxide oxidation catalyst

Abstract

The use of a treatment composition for a cigarette to reduce at least one constituent of mainstream smoke from a burning cigarette, the treatment composition comprising, in combination, an oxygen storage and donor metal oxide oxidation catalyst and an essentially non-combustible finely divided porous particulate adjunct.

Description

RELATED INVENTION [0001] This application claims benefit under 37 C.F.R. Section 1.78 of provisional application Ser. No. 60 / 502,665 filed Sep. 15, 2003. The full disclosure of the application is incorporated herein by reference.FIELD OF THE INVENTION [0002] This invention relates to the use of an oxygen storage and donor metal oxide oxidation catalyst to treat at least one constituent in mainstream smoke and more particularly, to reduce the amount of at least one constituent in the mainstream smoke. BACKGROUND OF THE INVENTION [0003] Work has been conducted to reduce sidestream smoke emissions from a burning cigarette. Oxygen storage and donor metal oxide oxidation catalysts have been used for reduction of sidestream smoke as described in various cigarette configurations of Applicant's published International Patent Applications: WO 98 / 16125 (U.S. Pat. No. 6,371,127); WO 99 / 53778 (U.S. Pat. No. 6,286,516); WO 02 / 24005 (U.S. patent application Ser. No. 09 / 954,432); WO 02 / 24006 (U.S....

AI Technical Summary

Benefits of technology

[0010] The same benefit is also achievable with the compositions and cigarette structures defined in Applicant's International Patent Applications: WO 02 / 24006 and WO 03 / 077687. This treatment of mainstream smoke may also be carried out with the reduction of sidestream smoke. Quite surprisingly, the use of the treatment composition in the paper, with or without sidestream smoke control, is capable of treating and reducing toxic constituents in the mainstream smoke.

[0011] To further enhance the activity of the oxygen donor material in the treatment composition, precious metals may also be used with the smoke treatment materials to enhance this action particularly when the treatment material is used in the paper or wrapper.

[0016] In another aspect of the present invention, the method for reducing at least one constituent of mainstream smoke emitted from a burning cigarette, the method comprising a step of using a treatment composition for cigarette tobacco and / or a cigarette filter, the treatment composition comprising, in combination, an oxygen storage and donor metal oxide oxidation catalyst, an essentially non-combustible finely divided porous particulate adjunct, and a precious metal.

[0019] In another aspect of the present invention, the use of a treatment composition in the manufacture of a cigarette paper / wrapper for a cigarette to reduce at least one constituent from a group of carbonyls and at least one constituent from a group of phenols of mainstream smoke from a burning cigarette, the treatment composition comprising, in combination, an oxygen storage and donor metal oxide oxidation catalyst and an essentially non-combustible finely divided porous particulate adjunct.

Problems solved by technology

When using a very active oxygen donor oxidation catalyst, such as cerium oxide, flare ups can be a problem when puffing on the cigarette and on lighting the cigarette.

Images