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US 12,532,907 B2Granted
Hydrophobic plug wrap
AssigneePhilip Morris Products S.A.
InventorsClement Besso, Aurelien Guyard, Alen Kadiric
Life of this patent
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Abstract
A smoking article includes a tobacco substrate and a filter segment comprising filtration material axially aligned in an abutting end to end relationship with the tobacco substrate. A hydrophobic plug wrap is disposed about the filtration material. The plug wrap is hydrophobic via hydrophobic groups chemically bonded to the plug wrap.
Claims18
A method for making hydrophobic plug wrap comprising:
- applying a liquid composition comprising a fatty acid halide to a surface of a plug wrap, maintaining the surface at a temperature of about 120° C. to about 180° C., wherein the fatty acid halide reacts in situ with protogenic groups of material in the plug wrap resulting in a formation of fatty acid esters, wherein the applying step comprises forming at least 100 discrete islands forming a pattern of hydrophobic area on the surface of the plug wrap, and the at least 100 discrete islands having an average lateral dimension of 5 μm to 100 μm.
Dependencies are inferred from the claim text.