C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 2/40 (2006.01) C08F 12/08 (2006.01)
Patent
CA 2640867
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 disclosed. 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.
Divulgation de compositions et de méthodes pour inhiber la polymérisation de monomères aromatiques vinyliques dans des systèmes de traitement exempts d'oxygène. Ces compositions comprennent un oxime et une hydroxylamine ou, autrement, un oxime ou un dinitrophénol, une hydroxylamine et une phénylènediamine. Ces méthodes comprennent l'addition de l'une de ces compositions au monomère aromatique vinylique en une quantité allant de 1 et environ 10 000 parties par million du monomère. Une méthode améliorée pour inhiber la polymérisation de monomères aromatiques vinyliques par une hydroxylamine est aussi divulguée. L'amélioration a pour objet l'ajout d'une quantité catalytique de phénylènediamine au système de monomère vinylique aromatique tout en remplaçant
Betz Laboratories Inc.
Borden Ladner Gervais Llp
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