| 摘要 |
<p>The present invention provides a method of reducing the levels of protoanemonin present in aqueous monomer solutions by adding an effective amount of one or more para-phenylenediamines having the formula: <CHEM> wherein R1, R2, R3 and R4 are the same or different radical selected from hydrogen, methyl, ethyl, n-propyl, iso-propyl, phenyl and methoxyphenyl with the proviso that at least one of R1, R2, R3 and R4 is hydrogen; R5, R6, R7 and R8 are the same or different radical selected from hydrogen, methyl, ethyl, n-propyl, iso-propyl, methoxy and ethoxy with the proviso that at least one of R5, R6, R7 and R8 is hydrogen; and salts thereof.</p> |
