Low sidestream smoke cigarette with combustible paper having a modified ash

Abstract

A low sidestream smoke cigarette comprises a conventional tobacco rod, and a combustible treatment paper having a sidestream smoke treatment composition. The treatment composition comprises in combination, an oxygen storage and donor metal oxide oxidation catalyst and an essentially non-combustible particulate adjunct for said catalyst. Improvements are made in the treatment composition and / or the addition of metal oxides or carbonates thereto to improve ash characteristics.

Description

FIELD OF THE INVENTION [0001] The invention relates to sidestream smoke reduction in burning cigarettes and other smoking products. More particularly, the invention relates to cigarette paper, cigarette wrapper, or a wrapper for a cigar or other like tobacco products for reducing visible sidestream smoke while providing a modified ash. BACKGROUND OF THE INVENTION [0002] Various attempts have been made to reduce or eliminate sidestream smoke emanating from a burning cigarette. The applicant developed various approaches to cigarette sidestream smoke control systems as described in its Canadian patents 2,054,735 and 2,057,962; U.S. Pat. Nos. 5,462,073 and 5,709,228 and published PCT applications WO 96 / 22031; WO 98 / 16125 and WO 99 / 53778. [0003] Other sidestream smoke control systems have been developed which use filter material or adsorptive material in the tobacco, filter or paper wrapper. Examples of these systems are described in U.S. Pat. Nos. 2,755,207, 4,108,151 and 4,225,636; EP ...

AI Technical Summary

Benefits of technology

[0020] In accordance with various aspects of this invention, cigarette paper, cigarette wrapper, wrapper for a cigar or other like tobacco products is provided for reducing visible sidestream smoke with an improved or modified ash.

[0025] In accordance with another aspect of the invention, the adjunct may comprise a mixed metal oxide or carbonate filler used in conjunction with a zeolite based material. The zeolite based material is preferably in an amount ranging from about 0.1% to 35% by weight of the total dry weight of the composition, although the amount could be higher. The mixture of metal oxides may include mixtures of zirconium oxide, tin oxide, titanium oxide, magnesium oxide, alumina, cerium oxide tin oxide, iron oxide, manganese oxide, calcium carbonate, zirconium carbonate, magnesium carbonate and mixtures thereof. The metal oxides may be of various surface areas and most preferably either low surface area in the range of about 5 to 15 m2 / g and high surface area of over 20 m2 / g. A cerium oxide hydrate sol may be applied to the adjunct, for example, the metal oxides to provide increase catalytic activity.

Problems solved by technology

The use of the activated carbon results in a slight drop in visible sidestream smoke.

The non-combustible wrap provides an acceptable degree of sidestream smoke control, however, due to the non-combustible nature of the wrap, a charred tube remains.

A variety of sidestream smoke control systems have been contemplated in the prior art but none of them contemplate a combustible cigarette paper which burns like a normal cigarette without appreciably affecting cigarette taste and has an acceptable ash.