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:
Oct. 31, 1995
Filed:
Jul. 21, 1993
Rolf Willmund, Emmendingen, DE;
Rhone-Poulenc Rhodia Aktiengesellschaft, Freiburg, DE;
Abstract
A filter tow from cellulose acetate filaments and/or staple fibers is described on the surface of which an additive from cellulose chain-splitting enzymes is present, at least the surface of the filaments and staple fibers consisting of a cellulose acetate having an acetyl number of less than 53%, preferably less than 49%. The method for the production of such a filter tow comprises spinning cellulose acetate filaments from a solution in acetone, of cellulose acetate of an acetyl number of at least 53% if necessary, cutting the filaments to staple fibers, gathering the filaments and/or staple fibers to a filter tow and applying an additive, the filaments and staple fibers being hydrolyzed and as additive one of cellulose chain-splitting enzymes is used. There are described also a tobacco smoke filter element from such a filter tow and a method for its production. The filter tow and the tobacco smoke filter element show improved biodegradation under the action of environmental influences, but without danger of degradation when they are stored under the conditions customarily used today.