Non-combustible carbonized cigarette filters

Details Non-combustible carbonized cigarette filters Non-combustible carbonized cigarette filters

1982-05-18

1985-05-14

Millin, V.

Tobacco

Smoke separator or treater

131359, 131369, 131334, 131341, 131342, A24D 306, A24D 118

Patent

active

045165890

ABSTRACT:
Non-combustible carbonized cigarette filters are manufactured wherein porous cellulosic material is contacted with a film-forming aqueous solution of an inorganic salt selected from the group consisting of alkali metal and ammonium silicates, carbonates, hydrophosphites, diphosphites, phosphites, hypophosphates, orthophosphates, diphosphates, triphosphates, polymetaphosphates, peroxymonophosphates, peroxydiphosphates, orthoborates, metaborates, tetraborates and mixtures thereof so that the cellulosic material contains at least about 1%, preferably from about 2% to about 6%, of the salt on a dry weight basis and then pyrolyzing the treated cellulosic material in an inert atmosphere at a temperature of at least about 700.degree. C. to about 900.degree. C., under conditions such that at least about 15%, preferably from about 20% to about 40% of the initial weight of the cellulosic material remains after pyrolysis.

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