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.

Description

FIELD OF THE INVENTION [0001] The invention relates to hot melt adhesives that are particularly useful in plug wrap sealing applications. The hot melt adhesives of the invention have excellent triacetin resistance. BACKGROUND OF THE INVENTION [0002] Cigarette filters are typically made from a crimped textile tow of cellulose acetate fibers. The textile tow is first bloomed to separate the cellulose acetate fibers, and then an organic solvent, more specifically triacetin, is applied to soften the fibers. The bloomed textile tow is then formed into a tube, and wrapped in paper (plug wrap) to form cigarette filters. The plug wrap paper is glued together along on longitudinal edge with a hot melt adhesive. In many instances, the constructed filter plug is actually multiple lengths of filter, which is then cut and separated into the individual filters later in the cigarette manufacturing process, i.e., prior to joining the tobacco rod to the filter plug. [0003] Resistance to triacetin is...

AI Technical Summary

Benefits of technology

[0004] The invention provides the art with a hot melt adhesive having excellent resistance to triacetin and filter plugs prepared using the adhesive and cigarettes comprising such filters. It has been found in accordance with the present invention, that hot melt adhesives comprising polar tackifiers provide unexpected advantages in cigarette filter manufacture.

Problems solved by technology

This is because during storage, triacetin migrates to the glue line and weakens the adhesive bond, resulting in a shorter shelf life of the resulting cigarette filters.