Degradable cigarette filters

Abstract

Biodegradable cigarette filters comprise shaped fiber of PHBV. Included among these fiber shapes in cross section are Y, V, C, Triad, 4-DG and JC shapes. The shaped fibers may include micro cavities with adsorbents and/or flavorants in the cavities.

1 . A biodegradable cigarette filter comprising shaped fibers of PHBV. 
   
   
       2 . A biodegradable cigarette filter as in  claim 1  wherein the fibers have a Y shape in cross section. 
   
   
       3 . A biodegradable cigarette filter as in  claim 1  wherein the fibers have a V shape in cross section. 
   
   
       4 . A biodegradable cigarette filter as in  claim 1  wherein the fibers have a C shape in cross section. 
   
   
       5 . A biodegradable cigarette filter as in  claim 1  wherein the fibers have a Triad shape in cross section. 
   
   
       6 . A biodegradable cigarette filter as in  claim 1  wherein the fibers have a 4-DG shape in cross section. 
   
   
       7 . A biodegradable cigarette filter as in  claim 1  wherein the fibers have a JC shape in cross section. 
   
   
       8 . A biodegradable cigarette filter as in  claim 1  wherein the fibers include micro cavities. 
   
   
       9 . A biodegradable cigarette filter as in  claim 8  including adsorbents in the micro cavities. 
   
   
       10 . A biodegradable cigarette filter as in  claim 9  wherein the adsorbents include carbon. 
   
   
       11 . A biodegradable cigarette filter as in  claim 8  including flavorants in the micro cavities. 
   
   
       12 . A biodegradable cigarette filter as in  claim 11  wherein the flavorants include menthol.