The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 25, 1997
Filed:
Oct. 17, 1996
Hiroyuki Matsumura, Himeji, JP;
Tohru Shibata, Himeji, JP;
Daicel Chemical Industries, Ltd., Osaka, JP;
Abstract
A tobacco filter is obtained by shaping a sheet material having a web structure and comprising (1) cellulose acetate or other cellulose ester short staple, and (2) a binder fiber selected from polysaccharides or their derivatives and biodegradable polymers, and having a binding property with respect to the short staple into a rod-form. The fiber (2) includes (2a) an esterified cellulose fiber, (2b) a cellulose fiber coated with a cellulose ester, (2c) a fibrillated cellulose ester fiber having a BET specific surface area of 0.5 to 4.5 m.sup.2 /g, and (2d) a cellulose fiber at least a part of its surface has been water-solubilized. The sheet material may further comprise a wood pulp or other beaten pulps. The proportion of the fiber (1) relative to fiber (2) is such that the former/the latter equals about 30/70 to 98/2 (weight %)