Method of increasing the hardness of cigarette filter elements
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United States of America Patent
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-
Mar 13, 1990
Grant Date -
N/A
app pub date -
Aug 24, 1988
filing date -
Aug 24, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Filter element and method for increasing the hardness thereof by contacting filter plug material with effective amounts of (a) a water soluble resin (or copolymer) having available chelate bond-forming chemical groups and (b) a water soluble nontoxic salt, the metal cation of the nontoxic salt forming a chelate bond with the chelate bond-forming chemical groups of said water soluble resin.
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