Cigarette filter material and cigarette filter

Details Cigarette filter material and cigarette filter Cigarette filter material and cigarette filter

2011-05-17

2011-05-17

Crispino, Richard (Department: 1747)

Tobacco

Smoke separator or treater

Having a polymer

C131S334000

Reexamination Certificate

active

07942154

ABSTRACT:
The present invention provides a cigarette filter material useful for selectively and efficiently reducing formaldehyde while maintaining a palatable component such as nicotine or tar. The cigarette filter material is obtained by coating-treating a substrate (such as a cellulose acetate fiber) with a solution (particularly, an aqueous solution) containing a polysaccharide having an amino group (e.g. chitosan) and a polar solvent (e.g., water) [and optionally an acid such as a hydroxy acid (e.g., lactic acid)]. A cigarette filter of such a cigarette filter material can efficiently and selectively reduce formaldehyde. For example, the cigarette filter ensures a retention of formaldehyde of not more than 65% while maintaining retentions of nicotine and tar of not less than 80%, respectively, in main stream smoke.

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English translation of JP63063369A.
Bioshell Inc., “Chitosan Specifications”, Mar. 2, 1983 (added to public archive May 24, 1999), Bates No. 508005725, Brown & Williamson Collection, http://legacy.library.ucsf.edu/tid
ri23f00.

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