Thermally insulative smoking article filter components
AssigneePhilip Morris USA Inc.
InventorsPiers Newbery, Antonis Tsakotellis, Susan E. Plunkett, Kenneth H. Shafer
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Abstract
A filter component includes a catalyst surrounded by a thermally insulative carbon fiber composite. The catalyst can catalyze the chemical reaction of selected gaseous constituents of a gas stream. During catalysis, the catalyst can reach high temperatures. The carbon fiber composite can contain heat generated during the catalysis within the filter component and thereby reduce heat transfer to the surroundings. The filter component can be used in smoking articles. Methods of making and using the filter-component and methods for treating mainstream tobacco smoke are also provided.
Claims22
A cigarette filter, comprising:
- a filter component including:
- a thermally insulative porous, carbon-bonded carbon fiber composite, wherein the carbon fiber composite is tubular and comprises an inner surface defining a cavity;
- and
- a catalyst contained within the cavity, the catalyst being effective to catalyze the chemical reaction of at least one selected constituent of mainstream tobacco smoke in the cigarette filter,
- wherein the catalyst substantially fills the cavity.
Dependencies are inferred from the claim text.