(57) Method method for making a chemically-treated filter element for cigarettes, to reduce
the concentration of nitrogen oxide by-products in cigarette smoke, by applying a
non-ionic solution or dispersion containing zinc oxide or zinc acetate to the substrate
in the garniture feed, the non-ionic solution or dispersion also containing a polyoxyalkylene
derivative of a sorbitan fatty acid ester, a monoester of a polyhydroxyalcohol, or
a diester of a polyhydroxy alcohol, or containing a mixture of the said dispersants.
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