Tobacco-smoke filters

Details Tobacco-smoke filters Tobacco-smoke filters

A - Human Necessities

24

D

131/18

A24D 3/00 (2006.01)

Patent

CA 1070587

ABSTRACT An improved tobacco-smoke filter or filter material contains granules of porous activated carbon to which has been applied a nitroxide of the group consisting of the nitroxide 4-oxo-2,2,6,6- tetramethylpiperidino-oxy, the nitroxide 1-nitronyl-3-oxyl-4,4,5,5- tetramethyl-2-phenyldihydroimidazole and mixtures thereof. The carbon may be loaded with 0.5 to 25%, suitable 1.0 to 15%, by weight of the nitroxide. Advantageously such a filter has provision for filter ventilation. For instance, in a triple filter with a centre section containing the treated carbon, the said centre section and/or the section upstream thereof is ventilated.

292017

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