US2020046016A1PendingUtilityA1

Filter materials and filters made therefrom

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Assignee: BRITISH AMERICAN TOBACCO INVESTMENTS LTDPriority: Jan 21, 2014Filed: Oct 17, 2019Published: Feb 13, 2020
Est. expiryJan 21, 2034(~7.5 yrs left)· nominal 20-yr term from priority
Inventors:Yahia LemmouchiAndrew E. DavisBarry DimmickMartin DaunerChristoph RiegerAndreas Ullrich
A24D 3/10A24D 3/063A24D 3/027A24D 3/04A24D 3/068A24D 3/0275B01D 39/18A24D 3/06A24D 3/08A24D 1/045
63
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Claims

Abstract

The present invention relates to filter material for inclusion in a smoking article, said filter material comprising a base material comprising or made from fibres having a first diameter or mean diameter, and fine fibres having a diameter or mean diameter which is smaller than the first diameter, wherein the filter material comprises more than 10% by weight and/or by volume fine fibres or wherein the diameter or mean diameter of the fine fibres is between about 1.0 μm and about 1.5 μm. The invention also relates to filters or filter elements comprising the filter material, smoking articles comprising the same, and use of the filter material in smoke filtration.

Claims

exact text as granted — not AI-modified
1 .- 15 . (canceled) 
     
     
         16 . A filter material for inclusion in a smoking article, wherein the filter material comprises:
 a base material comprising polylactide (PLA) and in the form of a sheet; and   fibres comprising cellulose acetate and in the form of a thread.   
     
     
         17 . The filter material according to  claim 16 , wherein the filter material comprises fine fibres having a diameter or mean diameter of between about 0.5 μm and about 10 μm. 
     
     
         18 . The filter material according to  claim 17 , wherein the filter material comprises at least about 1% by weight fine fibres. 
     
     
         19 . The filter material according to  claim 17 , wherein the filter material comprises at least about 1% by volume fine fibres. 
     
     
         20 . The filter material according to  claim 16 , wherein the fibres consist essentially of cellulose acetate. 
     
     
         21 . The filter material according to  claim 16 , wherein the base material consists essentially of PLA. 
     
     
         22 . A filter, which comprises the filter material of  claim 16 . 
     
     
         23 . A filter element, which comprises the filter material of  claim 16 . 
     
     
         24 . A smoking article, which comprises the filter material of  claim 16 .

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