Triacetin resistant hot melt adhesive

Abstract

Hot melt adhesives comprising a polar tackifier are triacetin resistant and particularly advantageous for use as a plug wrap sealing adhesive. Particularly preferred for use in the practice of the invention are hot melt adhesives comprising a rosin ester tackifier.

1 . A cigarette filter comprising a hot melt adhesive composition containing a polar tackifier.  
     
     
         2 . The cigarette filter of  claim 1  wherein the polar tackifier is a rosin ester.  
     
     
         3 . The cigarette filter of  claim 1  wherein the adhesive comprises at least one ethylene copolymer.  
     
     
         4 . The cigarette filter of  claim 3  wherein the adhesive comprises an ethylene vinyl acetate copolymer.  
     
     
         5 . The cigarette filter of  claim 4  wherein the adhesive comprises from about 20 to about 45 wt % ethylene vinyl acetate and from about 25 to 40 wt % of a rosin ester tackifier.  
     
     
         6 . The cigarette filter of  claim 1  wherein the rosin ester has a Gardner Color at 250° F. of less than about 3.  
     
     
         7 . The cigarette filter of  claim 6  wherein the rosin ester has a Gardner Color at 250° F. of less than about 2.  
     
     
         8 . A method of making a cigarette filter comprising wrapping a plug wrap paper having a leading and trailing end around the filter plug such that the leading and trailing ends overlap and securing the overlapping ends with a hot melt adhesive comprising a polar tackifier.  
     
     
         9 . The method of  claim 8  wherein the polar tackifier is a rosin ester.  
     
     
         10 . The method of  claim 8  wherein the adhesive comprises at least one ethylene copolymer.  
     
     
         11 . The method of  claim 10  wherein the adhesive comprises an ethylene vinyl acetate copolymer.  
     
     
         12 . The method of  claim 11  wherein the adhesive comprises from about 20 to about 45 wt % ethylene vinyl acetate and from about 25 to 40 wt % of a rosin ester tackifier.  
     
     
         13 . The method of  claim 8  wherein the rosin ester has a Gardner Color at 250° F. of less than about 3.  
     
     
         14 . The method of  claim 13  wherein the rosin ester has a Gardner Color at 250° F. of less than about 3.  
     
     
         15 . A cigarette comprising the filter of  claim 1 .  
     
     
         16 . The cigarette of  claim 15  wherein the polar tackifier is a rosin ester.  
     
     
         17 . The cigarette of  claim 16  wherein the adhesive comprises an ethylene vinyl acetate copolymer.  
     
     
         18 . The cigarette of  claim 17  wherein the adhesive comprises from about 20 to about 45 wt % ethylene vinyl acetate and from about 25 to 40 wt % of a rosin ester tackifier.  
     
     
         19 . The cigarette of  claim 15  wherein the rosin ester has a Gardner Color at 250° F. of less than about 3.  
     
     
         20 . The cigarette of  claim 15  wherein the rosin ester has a Gardner Color at 250° F. of less than about 2.