Filter cigarette

US6145511A · kind A · utility

Assignee

• RHODIA ACETOW GMBH · DE

Inventors

• Eberhard Teufel · Gundelfingen an der Donau, DE
• Wolfgang Sexauer · Glückstadt, DE
• Rolf Willmund · Emmendingen, DE

Key dates

• Filing date: May 4, 1998
• Grant date: Nov 14, 2000
• Expiry date: May 4, 2018

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A24D3/14
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A description is given of a filter cigarette, whose filter PA1 a) contains fibrous filter material, PA1 b) contains an additive with an antimutagenic action on the cigarette smoke in a quantity of less than 15 wt. %, based on the fiber weight of the filter and PA1 c) on smoking a similar unventilated filter cigarette, but not containing additive, has a nicotine retention R.sub.N (in %) (determined according to CORESTA recommended method No. 9) satisfying the following formula: EQU R.sub.N .gtoreq.100*(1-D) PA1 in which: EQU D=exp(A*B+C), PA2 with EQU A=21 mm-filter length (mm) for filter lengths.ltoreq.25 mm or EQU A=-4 mm for filter lengths>25 mm, EQU B=9.3*10.sup.-3 (1/mm) and EQU C=-(d.sup.4 *.DELTA.p*K+L) PA2 with d=filter diameter (mm), PA3 .DELTA.p=draw resistance of filter (mm hydraulic pressure), PA3 K=1.0228*10.sup.-6 (1/(mm.sup.4 *mm hydraulic pressure)) and PA3 L=0.2334. Using said filter and measured according to the Ames test with strain TA 98, it is possible to filter mutagenically acting substances with a selectivity of at least 10% better than other smoke ingredients. A particularly suitable method for the manufacture of such a filter cigarette is described.