Tobacco smoke filter materials, fibrous cellulose esters, and production processes
AssigneeDaicel Chemical Industries, Ltd.
InventorsHiroyuki Matsumura, Syu Shimamoto, Tohru Shibata
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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.
Claims4
A fibrillated cellulose ester fiber having an average diameter of 15 to 250 .mu.m and a BET specific surface area of 0.5 to 4.5 m.sup.2 /g.
A fibrillated cellulose acetate fiber having an average diameter of 20 to 200 .mu.m, a BET specific surface area of 0.5 to 4.0 m.sup.2 /g and an average fiber length of 0.2 to 5 mm, said cellulose acetate having an average degree of substitution of 1 to 2.7.
A process for producing a fibrillated cellulose ester fiber having an average diameter of 15 to 250 .mu.m and a BET specific surface area of 0.5 to 4.5 m2/g, which comprises extruding a cellulose ester solution from a nozzle into a precipitating agent for said cellulose ester and causing a shear force to act on the extrudate.
Dependencies are inferred from the claim text.