Tobacco smoke filter materials, fibrous cellulose esters, and production processes
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United States of America Patent
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Jan 26, 1999
Issued Date -
N/A
app pub date -
Mar 10, 1997
filing date -
Oct 21, 1994
priority date (Note) -
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Abstract
A tobacco smoke filter material comprises a fibrillated cellulose ester fiber with an average fiber diameter of 15 to 250 .mu.m and a BET specific surface area of 0.5 to 4.5 m.sup.2 /g. The fibrous cellulose ester content of the material may for example be not less than 20 weight %. The cellulose ester fiber is provided by, for example, extruding a cellulose ester solution from a nozzle into a precipitating agent for the particular cellulose ester and subjecting the extrudate to a shear force. This filter material can be used in the form of, for example, a filament, web or sheet to provide a tobacco smoke filter which assures good smoking qualities and excellent wet disintegratability.
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