Tobacco smoke filter

Abstract

Abstract Disclosed are cigarette filters containing compositions of certain cobalt or iron chelates adsorbed or supported on the surface of a suitable particulate support such as activated carbon particles. These cigarette filters remove substantial quantities of nitrogen oxides from cigarette smoke. Chelates suitable for use in this invention are of iron or cobalt and an organic compound containing a GROUP AND A FUNCTIONAL GROUP CAPABLE OF FORMING A BOND WITH THE IRON OR COBALT ATOM. In a first embodiment of the cigarette filter aspect of the invention the cigarette filter can comprise a cylinder of crimped, continuous, plasticized cellulose acetate fibers, and the activated carbon particles, having the chelate adsorbed or supported on the surface thereof, are bonded to the cellulose acetate fibers. In a second embodiment of the cigarette filter aspect of the invention the cigarette filter can comprise a first cylinder of crimped, continuous, plasticized cellulose acetate fiber, and coaxially positioned with respect to the first cylinder, a second cylinder of a composition comprising the activated carbon particles having the chelate adsorbed or supported on the surface thereof. In the composition aspect of the invention the composition comprises the material used to prepare the second cylinder. In one aspect of this invention the functional group capable of forming a bond with the iron or cobalt atom can be -OH or The chelate of cobalt and the condensation product of salicylaldehyde and ethylene diamine is a particularly desirable chelate for use in this invention. Polyethylene glycol diacetate is a particularly desirable plasticizer for the cellulose acetate fibers because it can also be used for bonding the activated carbon particles to the cellulose acetate fibers.

Inventors

• 👤 J Reynolds
• 👤 C Sloan

Bibliographic Details