Compositions and methods for inhibiting vinyl aromatic...

Details Compositions and methods for inhibiting vinyl aromatic... Compositions and methods for inhibiting vinyl aromatic...

C - Chemistry, Metallurgy

08

F

C08F 2/38 (2006.01) C08K 5/32 (2006.01) C08K 5/33 (2006.01) C09K 15/20 (2006.01)

Patent

CA 2501590

Compositions and methods for inhibiting polymerization of vinyl aromatic monomers in oxygen-free processing systems are disclosed. The compositions comprise an oxime compound and a hydroxylamine compound and, alternatively, an oxime compound or a dinitrophenol, a hydroxylamine compound and a phenylenediamine compound. The methods comprise adding one of the compositions to the vinyl aromatic monomer in an amount ranging from 1 to about 10,000 parts per million parts monomer. An improved method for inhibiting the polymerization of vinyl aromatic monomers with a hydroxylamine compound is also dis- closed. The improvement provides for adding a catalytic amount of a phenylenediamine compound to the vinyl aromatic monomer system while replacing any phenylenediamine compound lost as a result of physical removal from the system via the waste stream.

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