C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 57/075 (2006.01) C07C 51/47 (2006.01) C07C 51/50 (2006.01)
Patent
CA 2088106
ABSTRACT OF THE DISCLOSURE 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: Image I wherein R1, R2, R3 and R4 are the same or different radical selected from hydrogen, methyl, ethyl, n-propyl, iso-propyl, phenyl or 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 or ethoxy with the proviso that at least one of R5, R6, R7 and R8 is hydrogen; and salts thereof.
Bauer William Jr.
Quiros Nelson I.
Gowling Lafleur Henderson Llp
Rohm And Haas Company
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