| 摘要 |
A filter has a urethane-based main chain having a repeat unit of the formula, <img id="PRIVATE-USE-CHARACTER-00001" he="7.20mm" wi="8.47mm" file="US20050257798A1-20051124-Parenopenst.TIF" alt="private use character Parenopenst" img-content="character" img-format="tif" />R'-NH-COO-R-O-NH<img id="PRIVATE-USE-CHARACTER-00002" he="7.20mm" wi="8.47mm" file="US20050257798A1-20051124-Parenclosest.TIF" alt="private use character Parenclosest" img-content="character" img-format="tif" /><SUB>n</SUB>, wherein the R group and the R' group are an aliphatic chain and an aromatic group respectively. The R group, R' group, and -NH- moiety in the repeat unit serve as reactive radicals for trapping cyanides, phenols, or polynuclear aromatic compounds, wherein the reactive radicals are revealed through an extraction process to remove a plurality of contaminants from the urethane-based main chain.
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