Methods for inhibiting vinyl aromatic monomer polymerization

Chemistry of hydrocarbon compounds – Product blend – e.g. – composition – etc. – or blending process... – With nonhydrocarbon additive

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585 4, 585 24, C07C 720

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active

054897203

ABSTRACT:
An improved method for inhibiting the polymerization of vinyl aromatic monomer with a hydroxylamine compound is disclosed. The improvement provides for adding a catalytic amount of a phenylenediamine compound to the vinyl aromatic system while replacing any phenylenediamine compound lost as a result of physical removal from the system via the waste stream.

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patent: 4466905 (1984-08-01), Butler et al.
patent: 4720566 (1988-01-01), Martin
patent: 4774374 (1988-09-01), Abruscato et al.
patent: 4929778 (1990-05-01), Roling

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